[1] |
Chen Y, Cheng Y K, Zhu R B, et al. Nanoscale all-optical logic devices [J]. Science China-Physics Mechanics & Astronomy, 2019, 62(4): 044201. |
[2] |
Li P N, Dolado I, Alfaro-Mozaz F J, et al. Infrared hyperbolic metasurface based on nanostructured van der Waals materials[J]. Science, 2018, 359(6378): 892. |
[3] |
Li S Q, Xu X W, Veetil R M, et al. Phase-only transmissive spatial light modulator based on tunable dielectric metasurface[J]. Science, 2019, 364(6445): 1087. |
[4] |
Wang K, Titchener J G, Kruk S S, et al. Quantum metasurface for multiphoton interference and state reconstruction [J]. Science, 2018, 361(6407): 1104-1107. |
[5] |
Lin D M, Fan P Y, Hasman E, et al. Dielectric gradient metasurface optical elements [J]. Science, 2014, 345(6194): 298-302. |
[6] |
Li L, Jun Cui T, Ji W, et al. Electromagnetic reprogrammable coding-metasurface holograms [J]. Nat Commun, 2017, 8(1): 197. |
[7] |
Wang S, Wu P C, Su V C, et al. Broadband achromatic optical metasurface devices [J]. Nat Commun, 2017, 8(1): 187. |
[8] |
Longhi S, Feng L. Unidirectional lasing in semiconductor microring lasers at an exceptional point [Invited] [J]. Photonics Research, 2017, 5(6): B1-B6. |
[9] |
Hassan A U, Galmiche G L, Harari G, et al. Chiral state conversion without encircling an exceptional point [J]. Physical Review A, 2017, 96(5): 052129. |
[10] |
Wang C Q, Jiang X F, Zhao G M, et al. Electromagnetically induced transparency at a chiral exceptional point[J]. Nature Physics, 2020, 16(3): 334. |
[11] |
Hodaei H, Miri M A, Hassan A U, et al. Parity-time-symmetric coupled microring lasers operating around an exceptional point [J]. Optics Letters, 2015, 40(21): 4955-4958. |
[12] |
Smith D R, Pendry J B, Wiltshire M C K. Metamaterials and negative refractive index [J]. Science, 2004, 305(5685): 788-792. |
[13] |
Holloway C L, Dienstfrey A, Kuester E F, et al. A discussion on the interpretation and characterization of metafilms/metasurfaces: The two-dimensional equivalent of metamaterials [J]. Metamaterials, 2009, 3(2): 100-112. |
[14] |
Yu N F, Genevet P, Kats M A, et al. Light propagation with phase discontinuities: Generalized laws of reflection and refraction [J]. Science, 2011, 334(6054): 333-337. |
[15] |
Özdemir Ş K, Rotter S, Nori F, et al. Parity–time symmetry and exceptional points in photonics [J]. Nature Materials, 2019, 18(8): 783-798. |
[16] |
Bender C M, Boettcher S. Real spectra in non-Hermitian Hamiltonians having PT symmetry [J]. Physical Review Letters, 1998, 80(24): 5243-5246. |
[17] |
Gupta S K, Zou Y, Zhu X Y, et al. Parity-time symmetry in non-Hermitian complex optical media [J]. Advanced Materials, 2019, 32(27): 1903639. |
[18] |
Klaiman S, Guenther U, Moiseyev N. Visualization of branch points in PT-symmetric waveguides [J]. Physical Review Letters, 2008, 101(8): 080402. |
[19] |
Bender C M. PT symmetry in quantum physics: From a mathematical curiosity to optical experiments [J]. Europhysics News, 2016, 47(2): 18-20. |
[20] |
Peng B, Ozdemir S K, Lei F C, et al. Parity-time-symmetric whispering-gallery microcavities [J]. Nature Physics, 2014, 10(5): 394-398. |
[21] |
Miri M A, Alu A. Exceptional points in optics and photonics[J]. Science, 2019, 363(6422): 42. |
[22] |
Ruter C E, Makris K G, El-Ganainy R, et al. Observation of parity-time symmetry in optics [J]. Nature Physics, 2010, 6(3): 192-195. |
[23] |
Zhang N, Gu Z Y, Liu S, et al. Far-field single nanoparticle detection and sizing [J]. Optica, 2017, 4(9): 1151-1156. |
[24] |
Chen W J, Ozdemir S K, Zhao G M, et al. Exceptional points enhance sensing in an optical microcavity[J]. Nature, 2017, 548(7666): 192. |
[25] |
Laha A, Dey S, Gandhi H K, et al. Exceptional point and toward mode-selective optical isolation [J]. ACS Photonics, 2020, 7(4): 967-974. |
[26] |
Xu H, Mason D, Jiang L Y, et al. Topological energy transfer in an optomechanical system with exceptional points [J]. Nature, 2016, 537(7618): 80-83. |
[27] |
Feng L, Wong Z J, Ma R M, et al. Single-mode laser by parity-time symmetry breaking [J]. Science, 2014, 346(6212): 972-975. |
[28] |
Hodaei H, Miri M A, Heinrich M, et al. Parity-time-symmetric microring lasers [J]. Science, 2014, 346(6212): 975-978. |
[29] |
Lupu A, Benisty H, Degiron A. Switching using PT symmetry in plasmonic systems: positive role of the losses [J]. Optics Express, 2013, 21(18): 21651-21668. |
[30] |
Kang M, Chen J, Chong Y D. Chiral exceptional points in metasurfaces [J]. Physical Review A, 2016, 94(3): 033834. |
[31] |
Guo A, Salamo G J, Duchesne D, et al. Observation of PT-symmetry breaking in complex optical potentials [J]. Physical Review Letters, 2009, 103(9): 093902. |
[32] |
Lawrence M, Xu N, Zhang X, et al. Manifestation of PT symmetry breaking in polarization space with terahertz metasurfaces [J]. Phys Rev Lett, 2014, 113(9): 093901. |
[33] |
Park S H, Lee S-G, Baek S, et al. Observation of an exceptional point in a non-Hermitian metasurface [J]. Nanophotonics, 2020, 9(5): 1031-1039. |
[34] |
Sakhdari M, Farhat M, Chen P-Y. PT-symmetric metasurfaces: wave manipulation and sensing using singular points [J]. New Journal of Physics, 2017, 19(6): 065002. |
[35] |
Jin B B, Tan W, Zhang C H, et al. High-performance terahertz sensing at exceptional points in a bilayer structure [J]. Advanced Theory and Simulations, 2018, 1(9): 1800070. |
[36] |
Wang X, Fang X, Mao D, et al. Extremely asymmetrical acoustic metasurface mirror at the exceptional point [J]. Phys Rev Lett, 2019, 123(21): 214302. |
[37] |
Gu X T, Bai R P, Zhang C, et al. Unidirectional reflectionless propagation in a non-ideal parity-time metasurface based on far field coupling [J]. Optics Express, 2017, 25(10): 11778-11787. |
[38] |
Leung H M, Gao W S, Zhang R R, et al. Exceptional point-based plasmonic metasurfaces for vortex beam generation [J]. Optics Express, 2020, 28(1): 503-510. |
[39] |
Falcone F, Lopetegi T, Laso M A G, et al. Babinet principle applied to the design of metasurfaces and metamaterials [J]. Physical Review Letters, 2004, 93(19): 197401. |
[40] |
Li J Y, Fu J, Liao Q, et al. Exceptional points in chiral metasurface based on graphene strip arrays [J]. Journal of the Optical Society of America B-Optical Physics, 2019, 36(9): 2492-2498. |