Journals


2020

151. CCC Lin, P. Chang and Amr. S. Helmy, Supermode Hybridization: A Material-Independent Route toward Record Schottky Detection Sensitivity Using < 0.005 µm3 Amorphous Absorber Volume, ACS Nano Letters, vol 20, 5, 2950–2957, (2020).

150. CCC Lin, P. Chang, Y. Su, and Amr. S. Helmy, Monolithic Plasmonic Waveguide Architecture for Passive and Active Optical Circuits, ACS Nano Letters, vol. 20, 12, 8500-8507, (2020).

149. H. Liu, and A.S. Helmy, Joint measurement of time–frequency entanglement via sum frequency generation, Nature NPJ Quantum Information, No 6: 66, (2020).

148. B Janjua, Meng Iu, Zhizhong Yan; Paul Charles; Eric Chen; Amr S. Helmy, Passively Mode-Locked Bragg Lasers With 64 GHz Sub-300 fs Pulses at 785 nm, IEEE Phot Technol. Lett, Vol 32, 18, 1135 - 1138 (2020).

147. Lu Wang Yuchan Dong, Tingjiang Yan, Zhixin Hu, Abdinoor A Jelle, Débora Motta Meira, Paul N. Duchesne, Joel Yi Yang Loh, Chenyue Qiu, Emily E. Storey, Yangfan Xu, Wei Sun, Mireille Ghoussoub, Nazir P. Kherani, Amr S. Helmy, Geoffrey A. Ozin, Black Indium Oxide: Photothermal CO2 Hydrogenation Catalyst, Nature Commun., 11: 2432 (2020).

146. Meng Lon Iu, Nima Zareian, Dongpeng Kang, Eric Chen, Paul Charles, Bilal Janjua, Youichi Akasaka, Tadashi Ikeuchi, and Amr S. Helmy, Electrically-Pumped Efficient Broadband CW Frequency Conversion in Diode Lasers using Bulk Chi 2, Applied Phys. Lett. Photonics 5, 011301, (2020).

145. B Janjua, Meng Iu, P. Charles, E. Chen, A. S. Helmy, Single mode ring Bragg laser diodes, Optics Letter, vol. 45, 9, 2490-2493 (2020).

144. H. Liu, and A.S. Helmy, Enhancing classical target detection performance using nonclassical Light, IEEE A&E Systems Magazine, No. 10.1109/MAES.2020.2966316, (2020).

143. H. Liu, B. Balaji and A.S. Helmy, Target Detection aided by Quantum Temporal Correlations: Theoretical Analysis and Experimental Validation, IEEE Transactions on Aerospace and Electronic Systems, Vol 56, 5, 3529 - 3544vol (2020)

142. Y. He, D. Giovannini, H. Liu, and A.S. Helmy, “Non-classical Semiconductor Photon Sources Enhancing the Performance of Classical Target Detection Systems,” IEEE Journal. Lightwave Technolo. Vol 38, 16, 4540 - 4547, (2020).

2019

141. H. Liu, D. Giovannini, H. Y. He, D. England, B. J. Sussman, B. Balaji and AS Helmy, “Enhancing LIDAR performance metrics using continuous-wave photon-pair sources,” OSA Optica, Vol. 6, 1349-1355, (2019).

140. H. Wong, R. Prasankumar, R. Haglund and A. S. Helmy, “Broadband, Integrated, Micron-Scale, All-Optical Si3N4/VO2 Modulators pJ Switching Energy,” ACS Phot, vol. 6, 2734-2740, (2019).

139. P. Rofouie , E. Galati, L. Sun, A. S. Helmy, E. Kumacheva, “Hybrid Cholesteric Films with Tailored Polarization Rotation,” Adv. Funct. Mat. Vo 29, 1905552, (2019).

138. E. Storey, Amr. S. Helmy, Optimized preprocessing and machine learning for quantitative Raman spectroscopy in biology, J. Raman Spectr., Vol. 50 958-968, (2019).

137. Y. Su. Chen, C Lin and Amr. S. Helmy, Record Purcell factor using hybrid plasmonic structures, Science. Adv., Vol 5, eaav1790, (2019).

2018

136. H. M. K. Wong, M. K. Dezfouli, S. Axelrod, Stephen Hughes and Amr S. Helmy, Nanoscale plasmonic slot waveguides for enhanced Raman spectroscopy, Phys. Rev. B 98, 085124, (2018)

135. A. Brodutch, R. Marchildon, Amr S. Helmy, DynamicallyReconfigurable Sources for Arbitrary Gaussian States in Integrated Photonic Circuits, Opt Exp. Vol. 26, pp. 17635-17648 (2018). (pdf)

134. Z. M. Léger, A. Brodutch, Amr S. Helmy, Entanglement enhancement in multimode integrated circuits, Phys. Rev. A, Vol. 97, 062303, (2018). (pdf)

133. Curtis J. Firby, PoHan Chang, Amr S. Helmy, and Abdulhakem Y. Elezzabi, Versatile broadband polarization-independent optical circulators for nanophotonic integrated circuits, OSA JOSA B, Vol. 35, Issue 7, pp. 1504-1513, (2018). (pdf)

132. N. Zareian, D. Kang, Amr S. Helmy, Tuning Parametric processes in semiconductor Diode Lasers, OSA JOSA B, Vol. 35, pp 552-557, (2018).(pdf)

131. Herman M. K. Wong, and Amr S. Helmy, Performance Enhancement of Nano-Scale VO2 Modulators using Hybrid Plasmonics, IEEE J. Light. Technolo., Vol. 36, pp797-808, (2018).(pdf)

2017

130. P. Chang, C. Lin and Amr. S. Helmy, "Efficient Integrated Graphene Photonics in the Visible and Near‐IR", Laser and Photonics Reviews, Vol. 11, No. 5, 1700003, (2017). (pdf)

129. Y. Su, P. Chen, C. Lin and Amr. S. Helmy, "Highly sensitive wavelength-scale amorphous hybrid plasmonic detectors", OSA Optica, Vol. 4, No. 10, 1259-1262, (2017). (pdf)

128. Herman M. K. Wong, Mohsen Kamandar Dezfouli, Simon Axelrod, Stephen Hughes and Amr S. Helmy, "Theory of hyperbolic stratified nanostructures for surface enhanced Raman scattering", Phys. Rev. B 96, 205112, 2017 (pdf)

127. Wei Sun, Grace Zhong, Christian Kübel, Abdinoor A. Jelle, Chenxi Qian, Lu Wang, Manuchehr Ebrahimi, Laura M. Reyes, Amr S. Helmy, and Geoffrey A. Ozin, "Size-Tunable Photothermal Germanium Nanocrystals", Angewandte Chemie, article 01321, 2017. (pdf)

126. Simon Axelrod, Mohsen Kamandar Dezfouli, Herman M. K. Wong, Amr S. Helmy, and Stephen Hughes,"Hyperbolic metamaterial nanoresonators make poor single-photon sources", Phys. Rev. B 95, 155424 – Published 17 April 2017.(pdf)

125. Steven A. Rutledge, and Amr S. Helmy, “Etch-free addressable organic sensor arrays", Sensors and Actuators: A, vol. 253, pp 131-135 (2017). DOI information: 10.1016/j.sna.2016.11.016 (pdf)

2016

124. Curtis J. Firby, PoHan Chang, Amr S. Helmy, and Abdulhakem Y. Elezzabi, "Magnetoplasmonic Faraday rotators: enabling gigahertz active polarization control for integrated plasmonics", ACS Photonics, 2016, 3 (12), pp 2344–2352(pdf)

123. Yunfeng Li, Jeffrey Jun-Yan Suen, Elisabeth Prince, Egor M. Larin, Anna Klinkova, Héloïse Thérien-Aubin, Shoujun Zhu, Bai Yang, Amr S. Helmy, Oleg D. Lavrentovich and Eugenia Kumacheva, "Colloidal cholesteric liquid crystal in spherical confinement," Nature Communications, 7, 12520 (2016) (pdf)

122. Wei Sun, Chenxi Qian, Le He, Kulbir Kaur Ghuman, Annabelle P. Y. Wong, Jia Jia, Abdinoor A. Jelle, Paul G. O’Brien, Laura M. Reyes, Thomas E. Wood, Amr S. Helmy, Charles A. Mims, Chandra Veer Singh and Geoffrey A. Ozin, "Heterogeneous reduction of carbon dioxide by hydride-terminated silicon nanocrystals," Nature Communications, 7, 12553 (2016)(pdf)

121. Jia Jia, Paul G. O'Brien, Le He, Qiao Qiao, Teng Fei, Laura M. Reyes, Timothy E. Burrow, Yuchan Dong, Kristine Liao, Maria Varela, Stephen J. Pennycook, Mohamad Hmadeh, Amr S. Helmy, Nazir P. Kherani, Doug D. Perovic, Geoffrey A. Ozin “Visible and Near-Infrared Photothermal Catalyzed Hydrogenation of Gaseous CO2 over Nanostructured PdNb2O5,” Adv. Sci., 1600189, (2016).(pdf)

120. Dongpeng Kang, A. Anriban, A. S. Helmy “Monolithic semiconductor chips as a source for broadband wavelength-multiplexed polarization entangled photons,” Opt Exp. 24, pp 15160-15170. (2016). (pdf)

119. C. Lin, R. Grassi, T. Low and Amr S. Helmy. "Multilayer black phosphorus as a versatile mid-infrared electro-optic material" ACS Nano Lett. Reports 5, 12313 (2016).(pdf)

118. R. Marchildon and Amr. S. Helmy, “Dispersion-enabled quantum state control in photonics,” OSA Optica, Vol. 3, No. 3 2334-2536, 2016.(pdf)

117. P. Chen, C Lin and Amr. S. Helmy “Polarization Engineering in Nanoscale Waveguides Using Lossless Media,” IEEE J. Lght. Technolo., vol.34, pp 952-960, 2016.(pdf)

116. R. Marchildon and Amr. S. Helmy, “Deterministic separation of arbitrary photon pair states in integrated quantum circuits,” Laser Photonics Rev., 1–12 (2016) DOI 10.1002/lpor.201500133.(pdf)

115. Wei Sun, Chenxi Qian, Xiao Sherri Cui, Liwei Wang, Muan Wei, Gilberto Casillas, Amr S. Helmy and Geoffrey A. Ozin, “Silicon monoxide – a convenient precursor for large scale synthesis of near infrared emitting monodisperse silicon nanocrystals,” RSC Nanoscale , 8, 3678-3684, 2016.(pdf)

2015

114. Ana Querejeta-Fernández, Bernd Kopera, Karen S. Prado, Anna Klinkova, Myriam Methot, Grégory Chauve, Jean Bouchard, Amr S. Helmy, and Eugenia Kumacheva, Circular Dichroism of Chiral Nematic Films of Cellulose Nanocrystals Loaded with Plasmonic Nanoparticles, ACS Nano, 9 (10), pp 10377–10385, 2015.(pdf)

113. C. Lin, Amr S. Helmy. "Dynamically reconfigurable nanoscale modulators utilizing coupled hybrid plasmonics." Scientific Reports 5, 12313 (2015).(pdf)

112. D. Kang, Amr S. Helmy "Two polarization-entangled sources from the same semiconductor chip." Physical Review A 92.1, 013821 (2015).
(pdf)

111. A. Arjmand, P. Abolghasem. and A. S. Helmy “Interface modes for monolithic nonlinear optics,” J. Opt. Soc. Amerc. Vol. 32, pp 577-587 (2015).
(pdf)

110. Steven A. Rutledge, and Amr S. Helmy, “Etch-free patterning of PDOT:PSS for optoelectronics’ ACS Mat. Int., Vol. 7, pp 3490-3948 (2015).
(pdf)

2014

109. Fangxin Li and Amr S. Helmy, ‘Injection locking for stable all-optical pulse generation via gain-induced FWM,” Opt. Lett., Vol. 39, pp. 4408-4411, (2014).
(pdf)

108- Dongpeng Kang, A. Pang, Y. Zhao, and A. S. Helmy Two-photon quantum state engineering in nonlinear photonic nanowires,” J. Opt. Soc. Am. B Vol. 31, pp. 1581-1589 (2014).
(pdf)

107- W. Ma and Amr S. Helmy, "Asymmetric long-range hybrid-plasmonic modes in asymmetric nanometer-scale structures," J. Opt. Soc. Am. B, Vol. 31, pp. 1723-1729 (2014).
(pdf)

106- P. Abolghasem. D. Kang, D. F Logan, M. Lungwitz, and A. S. Helmy “Widely tunable frequency conversion in monolithic semiconductor waveguides at 2.4 μm, Opt. Lett., Vol. 39, pp. 3591-3594 (2014).
(pdf)

105- M. Swillam and Amr S. Helmy ‘Generalized Semi-analytical Design Methodology for Plasmonic Slot Waveguide Networks,’ Appl. Opt., Vol. 16, 065007, (2014).
(pdf)

104- Amr S. Helmy "Breakthroughs in Photonics 2013: Electrically Pumped Semiconductor Entangled Sources," IEEE Phot. Jrnl., 6, issue 2, 700206 (2014).
(pdf)

103- H. M. K. Wong, C. Lin, M. A. Swillam, A. S. Helmy, "Broadband Compact Silicon Wire to Silicon Slot Waveguide Orthogonal Bend," J. Lightwave Technol. 32, 1399-1405 (2014).
(pdf)

102- Dongpeng Kang, L. G. Helt, Sergei V. Zhukovsky, Juan P. Torres, J. E. Sipe, and A. S. Helmy "Hyperentangled photon sources in semiconductor waveguides," Phys. Rev. A 89, 023833 (2014).
(pdf)

2013

101- Steven A. Rutledge, Justin P. Freedman and Amr S. Helmy,‘Carrier mobility enhancement in poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) having undergone rapid thermal annealing’ J. Appl. Phys., 114, 133708, (2013).
(pdf)

100- F. Li, and A. S. Helmy, "Gigahertz to terahertz tunable all-optical single-side-band microwave generation via semiconductor optical amplifier gain engineering," Opt. Lett. 38, 4542 (2013).(pdf)

99- D. F. Logan, M. Giguere, A. Villeneuve, and A. S. Helmy, "Widely tunable mid-infrared generation via frequency
conversion in semiconductor waveguides," Opt. Lett. 38, 4457 (2013).(pdf)

98- B. J. Bijlani, P. Abolghasem, and A. S. Helmy "Semiconductor optical parametric generators in isotropic semiconductor diode lasers," Appl. Phys. Lett. 103, 091103 (2013).(pdf)

97- N. Zareian and A. S. Helmy, "Static and dynamic characteristics of integrated semiconductor optical parametric oscillators," J. Opt. Soc. Am. B 30, 2306 (2013).(pdf)

96- R. T. Horn, P. Kolenderski, D. Kang, P Abolghasem, C. Scarcella, A. D. Frera, A. Tosi, L. G. Helt, S. V. Zhukovsky, J. E. Sipe, G. Weihs, A. S. Helmy and T. Jennewein, "Inherent polarization entanglement generated from a monolithic semiconductor chip," Scientific Reports 3, 2314 (2013).(pdf)

95- L. M. Yin, S. Lee, J. S. W. Mak, A. S. Helmy, C. M. Deber, "Differential Binding of L- vs. D-isomers of Cationic Antimicrobial Peptides to the Biofilm Exopolysaccharide Alginate," Protein and Peptide Letters 20, 843 (2013).(pdf)

94- S. V. Zhukovsky, L. G. Helt, D. Kang, P. Abolghasem, A. S. Helmy, J. E. Sipe, "Analytical description of photonic waveguides with multilayer claddings: Towards on-chip generation of entangled photons and Bell states," Opt. Communications 301-301, 127 (2013).(pdf)

93- A. Valles, M. Hendrych, J. Svozilik, R. Machulka, P.
Abolghasem, D. Kang, B. J. Bijlani, A. S. Helmy, and J. P. Torres, "Generation of polarization-entangled photon pairs in a Bragg reflection waveguide," Opt. Express 21, 10841 (2013).(pdf)

92- H. M. K. Wong and A. S. Helmy, "Optically Defined Plasmonic Waveguides in Crystalline Semiconductors at Optical Frequencies," J. Opt. Soc. Am. B 30, 1000-1007 (2013).(pdf)

91- D. F Logan, A. B. Al Amin Dow, D. Stepanov, P. Abolghasem, N. P. Kherani, and A. S. Helmy, ‘Harnessing second-order optical nonlinearities at interfaces in multilayer silicon-oxy-nitride waveguides,’ Appl. Phys. Lett. 102, 061106, (2013).(pdf)

90- Fangxin Li and Amr S. Helmy, ‘All-optical pulse generation based on gain-induced four-wave mixing in a semiconductor optical amplifier,’ Opt. Lett., 38, 1241(2013).(pdf)

89- J. S. W. Mak, S. Rutledge, R. M. Abu-Ghazalah, F. Eftekhari, J. Irizar, N. C. M. Tam, G. Zheng, A. S. Helmy, ‘Advancements in Raman spectroscopy in hollow core photonics crystal fibers,’ Prog. Quant. Elec., vol. 37, 1-50, (2013).(Invited Review)(pdf)

2012

88- A. A. Farah, Steven A. Rutledge, Antje Schaarschmidt, Roger Lai, Justin P. Freedman and Amr S. Helmy,‘ Conductivity Enhancement of PEDOT:PSS Films Post-Spincasting,’ J. Appl. Phys., 112, 113709 (2012).(pdf)

87- C. Lin, A. S. Helmy, ‘Analytical Model for Metal-Insulator-Metal Mesh Waveguide Architectures,’ J. OSA B, vol. 29, 3157-3169 (2012).(pdf)

86- R. M. Abu-Ghazalah, S. Rutledge, Lewis W. Y. Lau, D. N. Dubins, R. B. Macgregor , Jr., Amr S. Helmy, ‘Concentration-Dependent Structural Transitions of Human Telomeric DNA Sequences,’ ACS Biochemistry, vol. 51 (37), pp 7357–7366 (2012).(pdf)

85- C. Lin, H. Wong, B. Lau, M. Swillam, A. S. Helmy, ‘Efficient broadband energy transfer via momentum matching at hybrid junctions of guided-waves,’ Appl. Phys. Lett., vol. 101, 123115 (2012).(pdf)

84- S. V. Zhukovsky, L. G. Helt, P. Abolghasem, D. Kang, J. E. Sipe, and A. S. Helmy, 'Bragg reflection waveguides as integrated sources of entangled photon pairs', J. Opt. Soc. Am. B 29, pp. 2516-2523(2012).(pdf)

83- B. J. Bijlani and A. S. Helmy, 'Design methodology for efficient frequency conversion in Bragg reflection lasers', J. Opt. Soc. Am. B 29, pp. 2484-2492(2012).(pdf)

82- P. Abolghasem, A. S. Helmy, 'Single-sided Bragg reflection waveguides with multilayer core for monolithic semiconductor parametric devices', J. Opt. Soc. Am. B 29, pp. 1367-1375(2012).(pdf)

81- Y. Wang, A. S. Helmy and G. V. Eleftheriades, 'Enabling two-dimensional optical subdiffraction imaging at an extended working distance: a planar antenna-array approach', J. Opt. Soc. Am. B 29, pp. 1119-1124(2012).(pdf)

80- M. A. Swillam, A. S. Helmy, 'Feedback Effects in Plasmonic Slot Waveguides Examined Using a Closed Form Model', IEEE Photon. Tech. Lett., vol. 24, pp. 497-499 (2012).(pdf)

79- D. Kang, A. S. Helmy, 'Generation of polarization entangled photons using concurrent type-I and type-0 processes in AlGaAs ridge waveguides', Opt. Lett., vol. 37, pp. 1481–1483 (2012).(pdf)

78- R. Horn, P. Abolghasem, B. J. Bijlani, D. Kang, A. S. Helmy, and G. Weihs, 'Monolithic Source of Photon Pairs', Phys. Rev. Lett., vol. 108, 153605 (2012).(pdf)

77- P. Abolghasem, J. B. Han, D. Kang, B. J. Bijlani, A. S. Helmy, ‘Monolithic Photonics Using Second-Order Optical Nonlinearities in Multilayer-Core Bragg Reflection Waveguides’, IEEE JSTQE, vol. 18, pp. 812-825 (2012) invited.(pdf)

76- F. Eftekhari, A. Lee, E. Kumacheva, and Amr S. Helmy, ‘Examining metal nanoparticle surface chemistry using hollow-core, photonic-crystal, fiber-assisted SERS’, Opt. Lett., vol. 37, pp. 680-682 (2012).(pdf)

75- S. V. Zhukovsky, L. G. Helt, D. Kang, P. Abolghasem, A. S. Helmy, and J. E. Sipe, ‘Generation of maximally-polarization-entangled photons on a chip’, Phys. Rev. A, vol. 85, 013838 (2012).(pdf)

2011

74- S. V. Zhukovsky, D. Kang, P. Abolghasem, L. G. Helt, J. E. Sipe, A. S. Helmy, 'Proposal for on-chip generation and control of photon hyperentanglement', Opt. Lett. Vol. 36, Issue 18, pp. 3548-3550 (2011).(pdf)

73- Y. Wang, A. S. Helmy, G. V. Eleftheriades, ‘Ultra-wideband optical leaky-wave slot antennas’, Optics Express, Vol. 19 Issue 13, pp.12392-12401 (2011).(pdf)

72- F. Eftekhari, J. Irizar, L. Hulbert, A. S. Helmy, ‘A comparative study of Raman enhancement in capillaries’, J. Appl. Phys, vol. 109, pp 113104-1 (2011).(pdf)

71- C. Z. Tong, B. J. Bijlani, L. J. Zhao, S. Alali, Q. Han, A. S. Helmy, ‘Mode Selectivity in Bragg Reflection Waveguide Lasers’, IEEE PTL, vol. 23, pp1025-1027 (2011).(pdf)

70- S. J. Wagner, B. M. Holmes, U. Younis, I. Sigal, A. S. Helmy, J. S. Aitchison, D. C. Hutchings, ‘Difference Frequency Generation by Quasi-Phase Matching in Periodically Intermixed Semiconductor Superlattice Waveguides’, IEEE JQE, vol. 47, pp 834-840 (2011).(pdf)

69- J. S. W. Mak, A. A. Farah, F. Chen, A. S. Helmy, ‘Photonic Crystal Fiber for Efficient Raman Scattering of CdTe Quantum Dots in Aqueous Solution’, ACS NANO, vol. 5, pp 3823-3830 (2011).(pdf)

68- N. Zareian, P. Abloghasem, A. S. Helmy, ‘Far Field of Bragg Reflection Waveguides: Characteristics and Closed-Form Approximation,’ IEEE/OSA JLT, vol. 29, pp 728-735 (2011).(pdf)

67- A. S. Helmy, P. Abolghasem, J. S. Aitchison, B. J. Bijlani, J. Han, B. M. Holmes, D. C. Hutchings, U. Younis, and S. J. Wagner ‘Recent Advances in Phase-Matching Second Order Nonlinearities in Monolithic Semiconductor Waveguides,’ Laser Photon. Rev., vol. 5, pp 272-286, (2011).(pdf)

66- Jiri Svozilk, M. Hendrych, A. S. Helmy, and Juan P. Torres, ‘Generation of paired photons in a quantum separable state in Bragg reflection waveguides,’ Opt. Express, vol. 19, pp 3115-3123 (2011).(pdf)

65- D. A. Stanley, H. Alizadeh, A. S. Helmy, N. P. Kherani, L. Qian, and S. Zukotynski ‘SEM-mapped micro-photoluminescence studies of highly luminescent micro-clusters in erbium-doped silicon-rich silicon oxide’, J. of Luminescence, vol. 131, pp. 72-77, (2011).(pdf)

2010

64- B. Lau, M. Swillam and A. S. Helmy, ‘Hybrid orthogonal junctions: wideband plasmonic slot-silicon waveguide couplers,’ Opt. Express, vol. 18, pp 27048-27059 (2010). (pdf)

63- J. B. Han, D. P. Kang, P. Abolghasem, B. Bijlani, A. S. Helmy, ‘Difference frequency generation in Bragg reflection waveguides,’ J. OSA B., vol. 27, pp 2488-2494, (2010). (pdf)

62- C. Tong, B. J. Bijlani, S. Alali and A. S. Helmy, ‘Characteristics of Edge Emitting Bragg Reflection Waveguide Lasers,’ J. Quant. Electron., vol. 46, pp 1605-1610, (2010). (pdf)

61- D. C. Hutchings, S. Wagner, B. M. Holmes, U. Younis, A. S. Helmy, J. S. Aitchison, ‘Type-II quasi phase matching in periodically intermixed semiconductor superlattice waveguides,’ Opt. Lett., vol. 147, pp123-129, (2010). (pdf)

60- M. Swillam and A. S. Helmy, ‘Analysis and applications of 3D rectangular metallic waveguides,’ Opt. Express, vol. 18, pp 19531-19543 (2010). (pdf)

59- J. B. Han, P. Abolghasem, D. P. Kang, B. J. Bijlani, A. S. Helmy, ‘Difference-frequency generation in AlGaAs Bragg reflection waveguides,’ Opt. Lett., vol. 35, 2334-2336, (2010). (pdf)

58- P. Abolghasem, J. B. Han, B. J. Bijlani, A. S. Helmy, ‘Type-0 second order nonlinear interaction in monolithic waveguides of isotropic semiconductors,’ Opt. Express, vol. 18, 12861-12689 (2010).(pdf)

57- J. B. Han, P. Abolghasem, B. J. Bijlani, A. Arjmand, S. Chaitanya Kumar, A. Esteban-Martin, M. Ebrahim-Zadeh, A. S. Helmy, Femtosecond second-harmonic generation in AlGaAs Bragg reflection waveguides: theory and experiment,’ J. OSA B., vol. 27, 1291-1298, (2010).(pdf)

56- R. M. Abu-Ghazalah, J. Irizar, A. S. Helmy, R. B. Macgregor Jr., ‘A study of the interactions that stabilize DNA frayed wires,’ Biophysical Chemistry, vol. 147, 123–129 (2010).(pdf)

55- C. Chen, G. Ding, B. S. Ooi, L. F. Lester, A. S. Helmy, T. L. Koch, J. C. M. Hwang, Optical injection modulation of quantum-dash semiconductor lasers by intra-cavity stimulated Raman scattering’ Opt. Express, vol. 18, 6211-6219 (2010).(pdf)

54- S. Rutledge, A. A. Farah, J. Dinglasan, D. Anderson, A. Das, J. Goh, C. Goh, A. S. Helmy, ‘Post-synthesis crystallinity tailoring of water-soluble polymer encapsulated CdTe nanoparticles using rapid thermal annealing,’ Mater. Res. Soc. Symp. Proc. Volume 1207E, 107-N03-08 (2010)(pdf)

2009

53- B. Bijlani, A. S. Helmy, ‘Bragg Reflection Waveguide Lasers’ Opt. Lett., vol. 34, 3734-3736, (2009).(pdf)

52- J. Han, P. Abolghasem, B. Bijlani, A. S. Helmy, ‘Sum Frequency generation in Semiconductor Waveguides,’ Opt. Lett., vol. 34, 3656-3658, (2009).(pdf)

51- S. A. Rutledge, A. A. Farah, J. Dinglasan, D. J. Anderson, A. Das, J. Goh, C. Goh, A. S. Helmy, ‘Post-Synthesis Crystallinity Enhancement of Colloidal CdTe Nanoparticles,’ ACS J. Phys. Chem. C, vol. 113, 20208,-20213 (2009).(pdf)

50- P. Abolghasem, J. Han, B. Bijlani, A. Arjmand, A. S. Helmy, ‘Highly Efficient Second-Harmonic Generation in Monolithic Matching-Layer Enhanced AlxGa1-xAs Bragg Reflection Waveguides,’ IEEE Photo. Technolo. Lett., vol. 21, 1462-1464, (2009).(pdf)

49- Y. Wang, A. M. Wong, L. Markley, A. S. Helmy, G. Eleftheriades, ‘Influence of Non-Adiabatic Annealing on Morphology and Molecular Structure of PEDOT-PSS Films,’ Opt. Express, vol. 17, 12351-12361 (2009).(pdf)

48- A. Schaarschmidt, A. A. Farah, A. Aby, A. S. Helmy, ‘Influence of Non-Adiabatic Annealing on Morphology and Molecular Structure of PEDOT-PSS Films,’ ACS J. Phys. Chem. B, vol. 113, 9352-9355 (2009).(pdf)

47- P. Abolghasem, M. hendrych, X. Shi, J. P. Torres, A. S. Helmy, ‘Bandwidth Control of Paired Photons Generated in Monolithic Bragg Reflection Waveguides,’ Opt. Lett., vol. 13, 2000-2002 (2009).(pdf)

46- Benjamin J. Stevens, Kristian M. Groom, David T. D. Childs, Y. Ang, Ryan R. Alexander, A. B. Krysa, John S. Roberts, Amr S. Helmy, Richard A. Hogg, ‘Operating Characteristics of GaAs/InGaP Self Aligned Stripe Lasers,’ J. J. Appl. Phys., vol. 48, 04C120, (2009).(pdf)

45- P. Abolghasem, J. Han, B. Bijlani, A. S. Helmy, ‘Continuous wave second harmonic generation in Bragg reflection waveguides,’ Opt. Express, vol. 11, 9460-9467, (2009).(pdf)

44- S. Wagner, B. M. Holmes, U. Younis, A. S. Helmy, J. S. Aitchison, D. C. Hutchings, ‘Continuous wave second-harmonic generation using domain-disordered quasi-phase matching waveguides,’ Appl. Phys. Lett., vol. 94, 151107, (2009).(pdf)

43- Kristian M. Groom, Benjamin J. Stevens, P. Joel Assamoi, John S. Roberts, Maxime Hugues, David T. D. Childs, Ryan R. Alexander, Mark Hopkinson, Amr S. Helmy, Richard A. Hogg, ‘Quantum Well and Dot Self-Aligned Stripe Lasers Utilizing an InGaP Opto-Electronic Confinement Layer,’ IEEE J. Sel. Top. Quant. Electron., vol. 15, 819-827 (2009).(pdf)

42- C. A. Merchant, P. Scrutton, S. Garcia-Blanco, C. Hnatovsky, R.S. Taylor, A. García-Navarro, G. García, F. Agulló-López, J. Olivares, A. S. Helmy, J.S. Aitchison, ‘Waveguide fabrication in KGd(WO4)2 formed by swift heavy ion irradiation,’ IEEE J. Quant. Electron., vol. 45, 373-379, (2009).(pdf)

41- P. Abolghasem, A. S. Helmy, ‘Matching layers in Bragg reflection waveguides for enhanced
nonlinear interaction,’ IEEE J. Quant. Electron., vol. 45, 646-653, (2009).(pdf)

40- S. Wagner, B. M. Holmes, U. Younis, A. S. Helmy, J. S. Aitchison, D. C. Hutchings,
‘Controlling third-order nonlinearities by ion-implantation quantum-well intermixing,’ IEEE
Photo. Technolo. Lett., vol. 21, 85-87, (2009). (pdf)

2008

39- P. Scrutton, B. Fung, A. S. Helmy, 'Interface Raman modes in intact and intermixed GaAs:AlAs superlattice structures,' J. Appl. Phys., vol. 104, 073103, 2008.(pdf)

38- Kristian M. Groom, Ryan R. Alexander, David T. D. Childs, Andrey B. Krysa, John S. Roberts, A. S. Helmy, Richard A. Hogg, 'GaAs-Based Buried Heterostructure Laser Incorporating an InGaP Opto-Electronic Confinement Layer,' Electron. Lett., vo. 44, 905-906, 2008.(pdf)

37- J. Irizar, J. Dinglasan, J.B. Goh1, A. Khetani, H. Anis, D. Anderson, C. Goh, A. S. Helmy, 'Ultra sensitive Raman Spectroscopy of Nanoparticles using Photonic Crystal Fibers ,' IEEE J. Selected Topics in Quantum Electronics, vol. 14, 1214-1222, 2008.(Invited) (pdf)

36- Aaron J. Zilkie, Joachim Meier, Mo Mojahedi, Philip J. Poole, Pedro Barrios, Daniel Poitras, Thomas J. Rotter, Chi Yang, Andreas Stintz, Kevin J. Malloy, A. S. Helmy, Peter W. E. Smith, J. S. Aitchison, 'Time-Resolved Linewidth Enhancement Factors in Quantum Dot and Higher-Dimensional Semiconductor Amplifiers Operating at 1.55 μm,' IEEE J. Light. Technolo., vol. 26, 1498-1509, 2008. (Invited) (pdf)

35- S. Wagner, A. Al Mehairy, J. S. Aitchison, A. S. Helmy, 'Modelling and optimization of qausi-phase matching using domain disordering,' IEEE J. Quant. Electron., vol. 44, 424-429, (2008).(pdf)

34- E. Shaffer, A. S. Helmy, D. Drouin, J. J. Dubowski, 'Excimer Laser-Induced Crystallization of CdSe Thin Films,' Applied Physics A, vol. 93, 869-874, (2008).(pdf)

33- B. Bijlani, P. Abolghasem, A. S. Helmy, 'Second Harmonic Generation in Ridge Bragg Reflection Waveguides,' Appl. Phys. Lett., 92, 101124, 2008.(pdf)

32- B. S. Ooi, B. . Djie, A. S. Helmy, J. C. M. Hwang, 'Broadband emission in InAs/InGaAlAs quantum-dash-in-well laser,' Advanced Materials Research, vol 31, 173-175, (2008).(pdf)

31- S. Eaton, C. A. Merchant, A. S. Helmy, P. R. Herman, J. S. Aitchison 'Low-loss waveguides with preserved Raman characteristics inscribed in KGd(WO4)2 by high repetition rate femtosecond fiber laser,' Appl. Phys. Lett., 92, 081105, 2008.(pdf)

30- A. H. Nejadmalayeri, P. Scrutton, J. Mak, A. S. Helmy, and P. R. Herman, J. Burghoff, S. Nolte, and A. Tunnermann, J. Kaspar, 'Fourth phenomenon in bulk ultrafast laser matter interaction: formation of silicon nanocrystals in vicinity of waveguide tracks,' Opt. Lett., vol. 32, 3474-3476, (2008).(pdf)

2007

29- A. S. Helmy, B. Bijlani, P. Abolghasem, 'Phase matching in monolithic Bragg reflection waveguides,' OSA Optics Lett., vol. 32,  2399-2401 (2007). (pdf)

28- S. Wagner, A. S. Helmy, D. C. Hutchings, J. S. Aitchison, 'Polarization-dependent nonlinear refraction and two-photon absorption in GaAs/AlAs superlattice waveguides below the half-bandgap,' OSA Journal of Optical Society of America B, vol. 24,1557-1563; (2007).(pdf)

27- P. Scrutton, M. Sorel, D. C. Hutchings, J. S. Aitchison, A. S. Helmy, 'Characterizing Bandgap Gratings in GaAs:AlAs Superlattice Structures using Interface Phonon Modes,' IEEE Photo. Technolo. Lett., vol. 19, 677-679 (2007). (pdf)

2006

26- A. S. Helmy, A. C. Bryce, D. C. Hutchings, J. S. Aitchison, J.H. Marsh, 'The spatial resolution of impurity-free vacancy disordering,' J. Appl. Phys., vol. 100, 123107 (2006).(pdf)

25- Brian R. West, A. S. Helmy, 'Dispersion tailoring of the quarter-wave Bragg reflection waveguide,' OSA Optics Express, vol. 14, 4073-4086 (2006).(pdf)

24- Brian R. West, A. S. Helmy, 'Exact Phase matching using Bragg Reflection Waveguides,' IEEE J. of Select. Topics in Quantum Electronics, vol. 12, 431-446 (2006).(pdf)

23- Brian R. West, A. S. Helmy, 'Properties of quarter wave Bragg reflection waveguides: Theory,' OSA Journal of Optical Society of America B, vol. 23, 1207-1220 (2006).(pdf)

22- A. S. Helmy, 'Phase matching using Bragg reflection waveguides for monolithic non-linear applications,' OSA Optics Express., vol. 14, 1243-1252 (2006).(pdf)

21- A. S. Helmy, P. Martin, J. P. Landesman, A. C. Bryce, J. S. Aitchison, J. H. Marsh, 'Spatially resolved Raman spectroscopy on GaAs-AlAs superlattice waveguides used for qausi-phase matching,' Journal of Crystal Growth, vol. 288, 53-56, (2006).(pdf)

20- T. C. Kleckner, A. S. Helmy, K. Zeaiter, D. C. HD. C. Hutchings J. S. Aitchison, 'Dispersion and modulation of the linear optical properties of GaAs/AlAs waveguides using quantum well intermixing,' IEEE J. of Quantum Electronics, vol 42, 280-286 (2006).(pdf)

2000

19- A. S. Helmy, D. C. Hutchings, T. C. Kleckner, J. H. Marsh, A. C. Bryce, J. M. Arnold, C. R. Stanley, and J. S. Aitchison, C. T. A. Brown, K. Moutzouris and M. Ebrahimzadeh, 'Quasi-phase matching in GaAs-AlAs superlattice waveguides via bandgap tuning using quantum well intermixing,' Optics Lett., vol. 25, P 1370, 2000.(pdf)

18- P. Dumais, A. Villeneuve, A. S. Helmy, J. S. Aitchison, L. Friedrich, R. A. Fuerst, G. I. Stegeman 'Toward soliton emission in asymmetric GaAs/AlGaAs multiple-quantum-well waveguide structures below the half-bandgap,' Optics Lett., vol. 25, P 1282, 2000.(pdf)

17- J. H. Teng, S. J. Chua, G. Li, A. S. Helmy, and J. H. Marsh, 'Control of the band gap shift in quantum well intermixing using a Germanium interlayer', Appl. Phys. Lett, vol. 76, P 1582, 2000.(pdf)

16- J. H. Teng, S. J. Chua, Y. H. Huang, G. Li, Z. H. Zhang, A. S. Helmy, J. H. Marsh, 'Multi-wavelength lasers fabricated by an Al layer controlled quantum well intermixing technology', J. Appl. Phys., vol 88, P 3458, 2000.(pdf)

15- T. K. Ong, B. S. Ooi, Y. L. Lam, Y. C. Chan and Y. Zhou, A. S. Helmy, 'High spatial resolution quantum well intermixing process in GaInAs/GaInAsP laser structure using pulsed photoabsorption induced disordering,' J. Appl. Phys., vol. 87, P 2775, 2000.(pdf)

14- D. Bhattacharayya, A. S. Helmy, A. C. Bryce, E. A. Avrutin, J.H. Marsh, 'Selective control of self-organized In0.5Ga0.5As/GaAs quantum dot properties: quantum dot intermixing,' J. Appl. Phys., vol. 88, P 4619, 2000.(pdf)

13- J.H. Marsh, D. Bhattacharyya,  A. S. Helmy, E. A. Avrutin, A.C. Bryce, 'Engineering Quantum Dot Lasers,' Physica E., vol.8, P 154, 2000.(pdf)

199X

12- A. S. Helmy, A. C. Bryce, C. N. Ironside, J. S. Aitchison, J.H. Marsh, 'Raman Spectroscopy for Characterising Compositional Intermixing in GaAs/AlGaAs Heterostructures,' Appl. Phys. Lett., vol. 74, P 3978, 1999.(pdf)

11- A. S. Helmy, S. K. Murad, A. C. Bryce, J. S. Aitchison, J.H. Marsh, S. K. Hicks, C. D. W. Wilkinson, 'Control of silica cap properties by oxygen plasma treatment for single-cap selective impurity free vacancy disordering,' Appl. Phys. Lett., vol. 74,  P 732, 1999.(pdf)

10- G. Li, S. J. Chua, S. J. Xu, X. C. Wang, A. S. Helmy, M. L. Ke, J.H. Marsh, 'Silica capping for Al0.3Ga0.7As/GaAs and In0.2Ga0.8As/GaAs quantum well intermixing,' Appl. Phys. Lett., vol. 73, P  3393, 1998.(pdf)

9- A. S. Helmy, J. S. Aitchison, and J. H. Marsh, 'Quantitative model for the kinetics of compositional intermixing in GaAs/AlGaAs quantum confined heterostructures,' IEEE J. Selected Topics in Quantum Electronics, vol. 4, P 653, 1998.(pdf)

8- A. S. Helmy, N. P. Johnson, M. L. Ke, A. C. Bryce, J. S. Aitchison, J.H. Marsh, I. Gontijo, G. S. Buller, J. Davidson, P. Dawson, 'A study of impurity-free vacancy disordering in GaAs/ AlGaAs for improved modelling,' IEEE J. Selected Topics in Quantum Electronics, vol. 4, P 661, 1998. (pdf)

7- P. Dumais, A. Villeneuve, A. S. Helmy, J. S. Aitchison, 'Soliton-emitting AlGaAs waveguide,' Optics Express, Vol. 2, P 455, 1998.(pdf)

6- M. Ke, A. S. Helmy, A. C. Bryce, J. S. Aitchison, J.H. Marsh, J. Davidson, P. Dawson, 'The electronic structure and optical properties of intermixed GaAs/AlGaAs double quantum wells,' J. Appl. Phys., vol. 84 P 2855, 1998.(pdf)

5- B. S. Ooi, Y.S. Tang, A. S. Helmy, A.C. Bryce, J.H. Marsh, M. Paquette, J. Beauvais, 'Optical characterisation of GaAs/AlGaAs quantum well wires fabricated using arsenic implantation induced intermixing,' J. Appl. Phys., vol. 83, P 4526, 1998.(pdf)

4- A. S. Helmy, J. S. Aitchison, and J. H. Marsh, 'The kinetics intermixing in GaAs/AlGaAs quantum confined heterostructures,' Appl. Phys. Lett., vol. 71, P 2998, 1997.(pdf)

3- B. S. Ooi, K. McIlvaney, A. S. Helmy, S. G. Ayling, A. C. Bryce, J. H. Marsh, 'Selective quantum well intermixing in GaAs/AlGaAs structures using impurity free vacancy disordering,' IEEE Journal of Quantum Electronics, vol. 33, P 1784 , 1997.(pdf)

2- F. Camacho, E. A. Avrutin, P. Cusumano, A. S. Helmy, A. C. Bryce, J. H. Marsh, 'Improvements in mode-locked semiconductor diode lasers using monolithic integrated passive waveguides made by quantum well intermixing,' IEEE Photonics Technology Letters, vol. 9, P 1208, 1997.(pdf)

1- P. Cusumano, B. S. Ooi, A. S. Helmy, S. G. Ayling, A. C. Bryce, J. H. Marsh, B. Voegele, M. J. Rose, 'Suppression of quantum well intermixing in GaAs/AlGaAs laser structures using phosphorous-doped SiO2 encapsulant layer,' Journal of Applied Physics, vol. 81, P 2445, 1997.(pdf)