[1] M. Segev, M.A. Bandres. Topological photonics: Where do we go from here?. Nanophotonics, 10, 425-434(2021).

[2] Y. Ota, K. Takata, T. Ozawa, A. Amo, Z. Jia, B. Kante, M. Notomi, Y. Arakawa, S. Iwamoto. Active topological photonics. Nanophotonics, 9, 547-567(2020).

[3] T. Ozawa, H.M. Price, A. Amo, N. Goldman, M. Hafezi, L. Lu, M.C. Rechtsman, D. Schuster, J. Simon, O. Zilberberg, I. Carusotto. Topological photonics. Rev. Mod. Phys., 91, 015006(2019).

[4] J.D. Joannopoulos, S.G. Johnson, J.N. Winn, R.D. Meade. Photonic crystals(2011).

[5] E.J. Bergholtz, J.C. Budich, F.K. Kunst. Exceptional topology of non-Hermitian systems. Rev. Mod. Phys., 93, 015005(2021).

[6] Y. Huang, Y. Shen, G. Veronis. Topological edge states at singular points in non-Hermitian plasmonic systems. Photon. Res., 10, 747-757(2022).

[7] H. Wang, X. Zhang, J. Hua, D. Lei, M. Lu, Y. Chen. Topological physics of non-Hermitian optics and photonics: a review. J. Opt., 23, 123001(2021).

[8] C.E. Rüter, K.G. Makris, R. El-Ganainy, D.N. Christodoulides, M. Segev, D. Kip. Observation of parity-time symmetry in optics. Nat. Phys., 6, 192-195(2010).

[9] R. El-Ganainy, K.G. Makris, M. Khajavikhan, Z.H. Musslimani, S. Rotter, D.N. Christodoulides. Non-Hermitian physics and pt symmetry. Nat. Phys., 14, 11-19(2018).

[10] H. Zhao, L. Feng. Parity-time symmetric photonics. Natl. Sci. Rev., 5, 183-199(2018).

[11] B. Peng, Ş.K. Özdemir, F. Lei, F. Monifi, M. Gianfreda, G.L. Long, S. Fan, F. Nori, C.M. Bender, L. Yang. Parity-time-symmetric whispering-gallery microcavities. Nat. Phys., 10, 394-398(2014).

[12] Ş.K. Özdemir, S. Rotter, F. Nori, L. Yang. Parity-time symmetry and exceptional points in photonics. Nat. Mater., 18, 783-798(2019).

[13] X.-S. Lin, J.-H. Yan, L.-J. Wu, S. Lan. High transmission contrast for single resonator based all-optical diodes with pump-assisting. Opt. Express, 16, 20949-20954(2008).

[14] X. Yin, X. Zhang. Unidirectional light propagation at exceptional points. Nat. Mater., 12, 175-177(2013).

[15] I. Slowik, Y. Zhang, A. Mischok, R. Brückner, V.G. Lyssenko, H. Fröb, N.M. Kronenberg, M.C. Gather, K. Leo. Fano-like interference in the emission spectra of a multimode organic microcavity. IEEE J. Sel. Top. Quantum Electron., 22, 60-65(2015).

[16] B. Peng, Ş.K. Özdemir, M. Liertzer, W. Chen, J. Kramer, H. Yilmaz, J. Wiersig, S. Rotter, L. Yang. Chiral modes and directional lasing at exceptional points. Proc. Natl. Acad. Sci. USA, 113, 6845-6850(2016).

[17] V.G. Kozlov, V. Bulović, P.E. Burrows, S.R. Forrest. Laser action in organic semiconductor waveguide and double-heterostructure devices. Nature, 389, 362-364(1997).

[18] C. Tzschaschel, M. Sudzius, A. Mischok, H. Fröb, K. Leo. Net gain in small mode volume organic microcavities. Appl. Phys. Lett., 108, 023304(2016).

[19] S. Pfuetzner, C. Mickel, J. Jankowski, M. Hein, J. Meiss, C. Schuenemann, C. Elschner, A.A. Levin, B. Rellinghaus, K. Leo, M. Riede. The influence of substrate heating on morphology and layer growth in c60: Znpc bulk heterojunction solar cells. Org. Electron., 12, 435-441(2011).

[20] K. Vandewal, J. Benduhn, V. Nikolis. How to determine optical gaps and voltage losses in organic photovoltaic materials. Sustain. Energy Fuels, 2, 538-544(2018).

[21] M. Koschorreck, R. Gehlhaar, V.G. Lyssenko, M. Swoboda, M. Hoffmann, K. Leo. Dynamics of a high-Q vertical-cavity organic laser. Appl. Phys. Lett., 87, 181108-13(2005).

[22] V. Kozlov, V. Bulović, P. Burrows, M. Baldo, V. Khalfin, G. Parthasarathy, S. Forrest, Y. You, M. Thompson. Study of lasing action based on forster energy transfer in optically pumped organic semiconductor thin films. J. Appl. Phys., 84, 4096-4108(1998).

[23] C. Kallinger, S. Riechel, O. Holderer, U. Lemmer, J. Feldmann, S. Berleb, A. Mückl, W. Brüntting. Picosecond amplified spontaneous emission bursts from a molecularly doped organic semiconductor. J. Appl. Phys., 91, 6367-6370(2002).

[24] K. Liao, X. Hu, T. Gan, Q. Liu, Z. Wu, C. Fan, X. Feng, C. Lu, Y.-C. Liu, Q. Gong. Photonic molecule quantum optics. Adv. Opt. Photon., 12, 60-134(2020).

[25] P. Yeh, M. Hendry. Optical waves in layered media. Phys. Today, 43, 77(1990).

[26] B. Schütte, H. Gothe, S.I. Hintschich, M. Sudzius, H. Fröb, V.G. Lyssenko, K. Leo. Continuously tunable laser emission from a wedge-shaped organic microcavity. Appl. Phys. Lett., 92, 163309(2008).

[27] A. Regensburger, C. Bersch, M.-A. Miri, G. Onishchukov, D.N. Christodoulides, U. Peschel. Parity-time synthetic photonic lattices. Nature, 488, 167-171(2012).

[28] A. Yariv, Y. Xu, R.K. Lee, A. Scherer. Coupled-resonator optical waveguide: a proposal and analysis. Opt. Lett., 24, 711-713(1999).

[29] M. Bayindir, B. Temelkuran, E. Ozbay. Tight-binding description of the coupled defect modes in three-dimensional photonic crystals. Phys. Rev. Lett., 84, 2140(2000).

[30] M. Bayindir, C. Kural, E. Ozbay. Coupled optical microcavities in one-dimensional photonic bandgap structures. J. Opt. A: Pure Appl. Opt., 3, 184(2001).

[31] W.P. Su, J.R. Schrieffer, A.J. Heeger. Solitons in polyacetylene. Phys. Rev. Lett., 42, 1698(1979).

[32] C. Yuce. Edge states at the interface of non-hermitian systems. Phys. Rev. A, 97, 042118(2018).

[33] Z. Lin, H. Ramezani, T. Eichelkraut, T. Kottos, H. Cao, D.N. Christodoulides. Unidirectional invisibility induced by p t-symmetric periodic structures. Phys. Rev. Lett., 106, 213901(2011).