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)

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)

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)

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)

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)

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)

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)

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)

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)

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)