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Publications

Year 2024

  1. Liu, J. H. Lee, M. Khajavikhan, “820-nm Coupled Distributed Feedback Laser System for THz Beat-frequency Generation,” Optics Letters, to appear (2024)
  2. Luo, Y. Wei, G. G. Pyrialakos, M. Khajavikhan, Demetrios N. Christodoulides, “Guiding charged particles in vacuum via Lagrange points”, Nature Communications, to appear (2024)
  3. Ren, G. G. Pyrialakos, F. O. Wu, N. K. Efremidis, M. Khajavikhan, D. N. Christodoulides, “Dalton’s law of partial optical thermodynamic pressures in highly multimoded nonlinear photonic systems,” Optics Letters 49, 1802-1805 (2024)
  4. H. Lou, Y. Wei, F. Wu, G. Pirialakos, D. N. Christodoulides, M. Khajavikhan, to appear in Nature Physics, (2024) https://www.nature.com/articles/s41567-023-02270-6Please see news articles:
    https://viterbischool.usc.edu/news/2024/01/trojan-photons-trapping-light-in-nowhere-land-using-lagrange-points/

    https://phys.org/news/2024-01-trojan-approach-lagrange.html

    https://www.optica-opn.org/home/newsroom/2024/january/guiding_light_with_optical_lagrange_points/https://www.iflscience.com/celestial-mechanics-used-in-optics-to-trap-and-guide-light-72719

    Youtube: https://www.youtube.com/watch?v=5gI_PBCVXJc

  5. G. G. Pyrialakos, F. O. Wu, P. S. Jung, H. Ren, K. G. Makris, Z. H Musslimani, M. Khajavikhan, T. Kottos, D. Christodoulides, “Slowdown of thermalization and the emergence of prethermal dynamics in disordered optical lattices,” Physical Review Research (2024)

Year 2023

  1. H Ren, GG Pyrialakos, FO Wu, PS Jung, NK Efremidis, M Khajavikhan, DN Christodoulides, “Nature of Optical Thermodynamic Pressure Exerted in Highly Multimoded Nonlinear Systems,” Physical Review Letters 131 193802 (2023)
  2. M. Muniz, F. O. Wu, P. S. Jung, M. Khajavikhan, D. N. Christodoulides, and U. Peschel, “Observation of photon-photon thermodynamic processes under negative optical temperature conditions,” Science 379 1019-1023 (2023)
  3. A. Selim, G. G. Pyrialakos, F. O. Wu, Z. Musslimani, K. G. Makris, M. Khajavikhan, D. N. ChristodoulidesThermalization of the Ablowitz–Ladik lattice in the presence of non-integrable perturbations Optics Letters 48 (8), 2206-2209 (2023)
  4. G Pyrialakos, A. Apostolidis, M. Khajavikhan, N. V. Kantartzis, D. N. Christodoulides, “Antichiral topological phases and protected bulk transport in dual-helix Floquet lattices,” Physical Review B 107 174313 (2023)
  5. Selim, F. Wu, G. G. Pyrialakos, M. Khajavikhan, D. N. Christodoulides, “Coherence properties of light in highly multimoded nonlinear parabolic fibers under optical equilibrium conditions,” Optics Letters 48 1208-1211 (2023)
  6. Hadiseh Nasari, Georgios G. Pyrialakos, Demetrios N. Christodoulides, and M. Khajavikhan, “Non-Hermitian topological photonics,” Optical Materials Express 13 870-885 (2023)

Year 2022

  1. G. N. Liu, Y. Wei, O. Hemmatyar, G. G. Pyrialakos, P. S. Jung, D. N. Christodoulides, M. Khajavikhan, “Complex Skin Modes in Non-Hermitian Coupled Laser Arrays,” Nature Light: Science & Technology (2022).
  2. H Ren, H Luo, MA Selim, GG Pyrialakos, FO Wu, M Khajavikhan, D. N. Christodoulides, “Rigorous analysis of optical forces in dielectric structures based on the Minkowski-Helmholtz formula,” Physical Review A 106 (3), 033517 (2022)
  3. S. Jung, G. G. Pyrialakos, F. O. Wu, M. Parto, M. Khajavikhan, W. Krolikowski, D. N. Christodoulides, “Thermalized equilibrium states of nonlinear photonic topological insulators,” Nature Communications accepted
  4. G. Pyrialakos, H. Ren, P. S. Jung, M. Khajavikhan, D. N. Christodoulides, “Thermalization dynamics of nonlinear non-Hermitian optical lattices,” PRL, accepted
  5. H. Luo, Y. Jia, F. Tian, M. Khajavikhan, D. Christodoulides, “Network analysis of Weyl semimetal photogalvanic systems”, Optics Letters,  Link
  6. A. Koulas-Simos, G. Sinatkas, T. Zhang, J.-L. Xu, W. E. Hayenga, Q. Kan, R. K.Zhang, M. Khajavikhan, C.-Z. Ning, S. Reitzenstien, “Extraction of silver losses at cryogenic temperatures through the optical characterization of silver-coated plasmonic nanolasers”, Optics Express, Link
  7. G. Pyrialakos, J. Beck, M. Heinrich, L. J. Maczewsky, M. Khajavikhan, N. V. Kantartzis, A. Szameit, D. N. Christodoulides, “Chain-driven Floquet topological insulators” Nature Materials, Link          https://www.ucf.edu/news/ucf-researchers-create-photonic-materials-for-powerful-efficient-light-based-computing/
  8. H. Nasari, G. Lopez-Galmiche, E. Lopez-Aviles, A. Schumer, A. U. Hassan, Q. Zhong, S. Rotter, P. LiKamWa, D. N. Christodoulides, M. Khajavikhan, “Observation of chiral state transfer without encircling an exceptional point,” Nature, Links41586-022-04542-2.                                                                                                                                                      Very proud of our three female postdocs/grad students (Hadiseh Nasari, Gisela Lopez-Galmiche, and Helena E Lopez-Aviles) that pulled off perhaps the most difficult experiment that has ever been carried out in our labs and unraveled the physics behind some of the most intriguing aspects of non-Hermitian systems.                                                                                                                                                             
  9. A. Schumer, Y. G. N. Liu, J. Leshin, L. Ding, Y. Alahmadi, A. U. Hassan, H. Nasari, S. Rotter, D. N. Christodoulides, P. LiKamWa, M. Khajavikhan, “Topological modes in a laser cavity through exceptional state transfer,” Science, 2022. link. arXiv link
  10. S. Jung, M. Parto, H. Nasari, M. Khajavikhan, W. Krolikowski, D. N. Christodoulides, “Optical transport and nonlinear switching in a topological low-dimensional discrete nematic liquid crystal setting”, Physical Review A 105 (1), 013513 (2022) link
  11. A. Selim, F. O. Wu, H. Ren, M. Khajavikha, D. N. Christodoulides “Thermodynamic description of the near- and far-field intensity patterns emerging from multimode nonlinear waveguide arrays”, Physical Review A 105 (1), 013514 (2022) link
  12. Xu, W. E. Hayenga, D. N. Christodoulides, M. Khajavikhan, P. Likamwa, “Direct Modulation of Electrically Pumped Coupled Microring Lasers,” Opt. Express 30, 1143-1151 (2022) link

Year 2021

  1. Y. N. G. Liu, M. Parto, P. Jung, D. N. Christodoulides, M. Khajavikhan, “Gain induced topological response via long range interactions,” Nature Physics (2021) link
  2. J.-H. Choi, W. Hayenga, Y. Liu, M. Parto, B. Bahari, D. N. Christodoulides, M. Khajavikhan, “Room temperature electrically pumped topological insulator lasers,” Nature Communications, (2021) link link
  3. Y. N. G. Liu, O. Hemmatyar, A. U. Hassan, P. Jung,J.-H. Choi, D. N. Christodoulides, M. Khajavikhan, “Engineering Interaction Dynamics in Active Resonant Photonic Structures,” APL Photonics (2021) link
  4. Parto, Y. Liu, B. Bahari, M. Khajavikhan, D. N. Christodoulides, “Non-Hermitian and topological photonics: optics at an exceptional point,” Nanophotonics (2021) link
  5. George, A. Bruhacs, A. Aadhi, W. E. Hayenga, R. Ostic, E. Whitby, M. Kues, Z. M. Wang, C. Reimer, M. Khajavikhan, R. Morandotti, “Time-resolved second-order coherence characterization of broadband metallic nanolasers,” Laser & Photonics Reviews (2021) link
  6. Haoqin Deng, Mercedeh Khajavikhan, “Parity-time symmetric optical neural networks,” Optica 8, 1328-1333 (2021) link
  7. B. Bahari, J.-H. Choi, Y. G. N. Liu, M. Khajavikhan, “Majorana Bound State Cavities”, Physical Review B 104 (23), 235423 (2021) link

Year 2020

  1. F. Wu, P. S. Jung, M. Parto, M. Khajavikhan, D. N. Christodoulides, “Entropic thermodynamics of nonlinear photonic chain networks,” Nature Communication Physics, (2020)
  2. Parto, W. E. Hayenga, A. Marandi, D. N. Christodoulides, M. Khajavikhan, “Nanolaser-based emulators of spin Hamiltonians,” Nanophotonics (2020)
  3. Kreinberg, K. Laiho, F. Lohof, W. E. Hayenga, P. Holewa, C. Gies, M. Khajavikhan, S. Reitzenstein, “Thresholdless transition to coherent emission at telecom wavelengths from coaxial nanolasers,” Laser and Photonics Review, (2020)
  4. E. Hayenga, H. Garcia-Gracia, E. Sanchez Cristobal, M. Parto, H. Hodaie, P. LiKamWa, D. N. Christodoulides, M. Khajavikhan, “Electrically Pumped Microring Parity-Time Symmetric Lasers,” Proceedings of the IEEE,108 827 – 836 (2020)
  5. Xu, W. E. Hayenga, H. Hodaei, D. N. Christodoulides, M. Khajavikhan, P. Likamwa, “Modulation bandwidth enhancement in PT-symmetric lasers,” Optics Express 28(13) 19608-19619 (2020)
  6. S. Nye, A. E. Halawany, C. Markos, M. Khajavikhan, D. N. Christodoulides, “Flexible PT-symmetric optical metasurfaces,” Physical Review Applied 13, 064005 (2020)
  7. Parto, W. E. Hayenga, A. Marandi, D. N. Christodoulides, M. Khajavikhan, “Realizing spin-Hamiltonians in nanoscale active photonic lattices,” Nature Materials, 19 725-731 (2020)

Year 2019

  1. P. Hokmabadi, A. Schumer, D. N. Christodoulides, M. Khajavikhan, “Non-Hermitian Ring Laser Gyroscopes with Enhanced Sagnac Sensitivity,” Nature, 576, 70 (2019)
  2. Zhong, S. Nelson, M. Khajavikhan, D.N. Christodoulides, R. El-Ganainy, “Bosonic discrete supersymmetry for quasi-two-dimensional optical arrays,” Photon. Res.7, 1240 (2019)
  3. E. Hayenga, M. Parto, J. Ren, F. Wu, M. P. Hokmabadi, C. Wolff, R. El-Ganainy, N. A. Mortensen, D. N. Christodoulides, M. Khajavikhan, “Direct generation of tunable orbital angular momentum beams in microring lasers with broadband exceptional points,” ACS Photonics, 6, 1895 (2019)
  4. Xu, W. E. Hayenga, M. Khajavikhan, P. Likamwa, “Measuring the frequency response of optically pumped metal-clad nanolasers,” Opt. Express 27, 21834-21842 (2019)
  5. El-Ganainy, M. Khajavikhan, D. N. Christodoulides, S. Ozdemir, “The dawn of non Hermitian optics”, Nature Communications Physics (2019) – perspective.
  6. Zhong, J. Ren, M. Khajavikhan, D. N. Christodoulides, S. K. Ozdemir, R. El-Ganainy, “Sensing with exceptional surfaces: combining sensitivity with robustness”, Physical Review Letters 122, 153902 (2019)
  7. P. Hokmabadi, N. Nye, R. El-Ganainy, D. N. Christodoulides, M. Khajavikhan, “Supersymmetric Laser Arrays”, Science 363 623 (2019)
  8. Parto, H. Lopez-Aviles, J. E. Antonio-Lopez, M. Khajavikhan, R. Amezcua-Correa, D. N. Christodoulides, “Observation of twist-induced geometric phases and inhibition of optical tunneling via Aharonov-Bohm effects,” Science Advances, 5 eaau8135 (2019)

Year 2018

  1. Khajavikhan, S. Wittek, M. Parto, J. Ren, D. N. Christodoulides, G. Harari, M. Segev, M. A. Bandres, “Topological Photonics Meets Lasers,” OPN Year in Review (2018)
  2. Mortensen, P. A. D. Goncalves, M. Khajavikhan, D. N. Christodoulides, C. Tserkezis, C. Wolff, “Optical Fluctuations and noise-limited sensing near the exceptional point of PT-symmetric resonator systems,” Optica 5, 1342-1346 (2018)
  3. Zhong, M. Khajavikhan, D.N. Christodoulides, and R. El-Ganainy, “Winding around Non-Hermitian Singularities: General Theory and Topological Features,” Nature Communications 9 4808 (2018)
  4. Ren, Y. G. N. Liu, M. Parto, W. E. Hayenga, M. P. Hokmabadi, D. N. Christodoulides, M. Khajavikhan, “Unidirectional light emission in PT-symmetric microring lasers,” Opt. Express 26, 27153-27160 (2018)
  5. Parto, S. Wittek, H. Hodaei, G. Harari, M. A. Bandres, J. Ren, M. C. Rechtsman, M. Segev, D. N. Christodoulides, M. Khajavikhan, “Complex Edge-State Phase Transitions in 1D Topological Laser Arrays,” Physical Review Letters, 120, 113901 (2018)
  6. Zhong, D. N. Christodoulides, M. Khajavikhan, K. Makris, R. El-Ganainy, “Power-law scaling of extreme dynamics near higher-order exceptional points”, Phys. Rev. A 97, 020105 (2018)
  7. Bandres, S. Wittek, G. Harari, M. Parto, J. Ren, M. Segev, D. N. Christodoulides, M. Khajavikhan, “Topological Insulator Laser: Experiments,” Science, 359, 4003 (2018)
  8. Harari, M. A. Bandres, Y. Lumer, M. C. Rechtsman, Y. D. Chong, M. Khajavikhan, D. N. Christodoulides, M. Segev, “Topological Insulator Laser: Theory,” Science, 359, 4001 (2018)
  9. U. Hassan, H. Hodaei, D. N. Christodoulides, M. Khajavikhan, “Exceptional Points: An Emerging Tool for Sensor Applications,” Optics & Photonics News, January (2018)
  10. El-Ganainy, K. Makris, M. Khajavikhan, Z. Musslimani, S. Rotter, D. N. Christodoulides, “Non-Hermitian paradigms in physics: PT symmetry and beyond,” Nature Physics, 14, 11–19 (2018)
  11. Khajavikhan, M. A. Miri, A. Alu, D. N. Christodoulides, “Parity-Time Symmetry in Optics,” Encyclopedia of Modern Optics II, (2018)

Year 2017

  1. U. Hassan, G. L. Galmiche, G. Harari, P. LiKamWa, M. Khajavikhan, M. Segev, D. N. Christodoulides, “Chiral state conversion without encircling an exceptional point,” Physical Review A 96 052129 (2017)
  2. Hodaei, A. U. Hassan, S. Wittek, J. H. Garcia-Gracia, R. El-Ganainy, D. N. Christodoulides, M. Khajavikhan, “Enhanced sensitivity in photonic molecule systems using higher order non-Hermitian exceptional points,” Nature 548,187–191 (2017)
  3. Parto, H. Lopez-Aviles, M. Khajavikhan, R. Amezcua-Correa, D. N. Christodoulides, “Topological Aharonov-Bohm suppersion of optical tunneling in twisted nonlinear multicore fibers,” Physical Review A 96, 043816 (2017)
  4. H. Teimouripour, M. Khajavikhan, D. N. Christodoulides, R. El-Ganainy, “Robustness and mode selectivity in parity-time (PT) symmetric lasers,” Scientific Reports 7, 10756 (2017)
  5. Hayenga and M. Khajavikhan, “Unveiling the Physics of Microcavity Lasers,” Light: Science & Applications – New and Views (2017)
  6. Aleahmad, M. Khajavikhan, D. N. Christodoulides, P. Likamwa, “Integrated multi-port structures for unidirectional optical information transport”, Scientific Reports 7 Article number: 2129 (2017)
  7. Ren, H. Hodaei, G. Harari, A. U. Hassan, W. Chow, M. Soltani, D. N. Christodoulides, M. Khajavikhan, “Ultrasensitive micro-scale parity-time-symmetric ring laser gyroscope,” Opt. Lett. 42, 1556-1559 (2017)
  8. U. Hassan, B. Zhen, M. Soljacic, M. Khajavikhan, D. N. Christodoulides, “Dynamically encircling exceptional points: Exact evolution and polarization state conversion”, Physical Review Letters 118, 093002 (2017)

Year 2016

  1. E. Hayenga, J.H. Garcia-Garcia, H. Hodaei, C. Reimer, R. Morandotti, P. Likamwa, M. Khajavikhan, “Second-order coherence properties of metallic nanolasers,” Optica, 3 1187-1193 (2016)
  2. Hodaei, M.A. Miri, A. U. Hassan, W. Hayenga, D. N. Christodoulides, M. Khajavikhan, “Dark state microring lasers: Mode management using exceptional points”, Opt. Lett. 41, 3049 (2016)
  3. AlHalawany, S. He, H. Hodaei, A. Bakry, M. A. N. Razvi, A. Alshahrie, N. J. J. Johnson, D. N. Christodoulides, A. Almutairi, M. Khajavikhan, “Enhanced UV upconversion emission using plasmonic nanocavities”, Opt. Exp., 24,13999-14009 (2016)
  4. U. Hassan, H. Hodaei, M.-A. Miri, M. Khajavikhan, D. N. Christodoulides, “An integrable nonlinear parity-time symmetric optical oscillator”, Physical Review E, 93, 042219 (2016)
  5. Hodaei, M. A. Miri, W. Hayenga, A. Ulhassan, M. Heinrich, D. N. Christodoulides, M. Khajavikhan, “Single mode lasing in transversely multi-moded PT-symmetric microring resonators”, Laser and Photonics Review, 10 494–499, (2016)
  6. E. Hayenga, H. Hodaei, J. H. Garcia-Garcia, Y. Fainman, M. Khajavikhan, “Metallic Coaxial Nanolasers”, Advances in Physics: X, 1 262-275 (2016) Invited
  7. Nye, A. Alhalawany, M. Khajavikhan, D. Christodoulides, “Passive PT-symmetric metasurfaces with directional field scattering characteristics”, IEEE JSTQE 22 5000608 (2016)
  8. Hodaei, A. U. Hassan, J.-H. Ren, W. E. Hayenga, M.A. Miri, D. N. Christodoulides, M. Khajavikhan, “Design considerations for single mode microring lasers using parity-time-symmetry”, IEEE JSTQE, 22, 1500307 (2016)

Year 2015

  1. U. Hassan, H. Hodaei, M.-A. Miri, M. Khajavikhan, D. N. Christodoulides, “Nonlinear reversal of PT-symmetric phase transition in a system of coupled semiconductor micro-ring resonators”, Physical Review A., 92, 063807 (2015)
  2. Hodaei, M. A. Miri, A. Ulhassan, W. Hayenga, M. Heinrich, D. N. Christodoulides, M. Khajavikhan, “Parity-time-symmetric coupled microring lasers operating around an exceptional point”, Opt. Lett., 40, 4955-4958 (2015)
  3. El-Ganainy, L. Ge, M. Khajavikhan, D. Christodoulides, “Supersymetric laser arrays”, Physical Review A 92, 033818 (2015)

Year 2014

  1. Hodaei, M. A. Miri, M. Heinrich, D. N. Christodoulides, M. Khajavikhan, “Parity-time–symmetric microring lasers,” Science 346, 975 (2014)
  2. El-Ganainy, M. Khajavikhan, L. Ge, “Exceptional points and lasing self-termination in photonic molecules”, Physical Review A 90, 013802 (2014)
  3. Lantigua, S. He, M. Akhlaghi Bouzan, W. Hayenga, N. J. J. Johnson, A. Almutairi, M. Khajavikhan, “Engineering upconversion emission spectra using plasmonic nanocavities,” Opt. Lett. 39, 3710-3713 (2014)

Year 2012 and before

  1. Khajavikhan, A. Simic, M. Katz, J. H. Lee, B. Slutsky, A. Mizrahi, V. Lomakin and, Y. Fainman, “Thresholdless Nanoscale Coaxial Lasers”, Nature 482 204–207 (2012)
  2. Lee, M. Khajavikhan, A. Simic, Q. Gu, O. Bondarenko, B. Slutsky, M. P. Nezhad, and Y. Fainman, “Electrically pumped sub-wavelength metallo-dielectric pedestal pillar lasers”, Opt. Express, 19, 21524-21531 (2011)
  3. Nezhad, O. Bondarenko, M. Khajavikhan, A. Simic, Y. Fainman, “Etch-free Low Loss Silicon Waveguides Using Hydrogen Silsesquioxane Oxidation Masks”, Opt. Express 19, 18827-18832 (2011)
  4. Zamek, L. Feng, M. Khajavikhan, D. T. H. Tan, M. Ayache, and Y. Fainman, “Micro-resonator with metallic mirrors coupled to a bus waveguide,” Opt. Express 19, 2417-2425 (2011)
  5. Zamek, Dawn T. H. Tan, M. Khajavikhan, M. Ayache, M. P. Nezhad, and Y. Fainman, “Compact chip-scale filter based on curved waveguide Bragg gratings,” Opt. Lett. 35, 3477-3479 (2010)
  6. Khajavikhan, K. John, J. R. Leger, “Experimental Measurements of Supermodes in Superposition Architectures for Coherent Laser Beam Combining,” Journal of Quantum Electronics, IEEE 46 1221 (2010)
  7. Khajavikhan, J. R. Leger., “Modal Analysis of Path Length Sensitivity in Superposition Architectures for Coherent Laser Beam Combining,” Selected Topics in Quantum Electronics, IEEE 15 281(2009)
  8. Khajavikhan, A. Hoyer-Leitzel, J. R. Leger, “Efficient conversion of light from sparse laser arrays into single-lobed far field using phase structures,” Opt. Lett. 33 2377 (2008)
University of Southern California