[1] Chen H T, Taylor A J, Yu N F. A review of metasurfaces: physics and applications[J]. Reports on Progress in Physics, 79, 076401(2016).
[2] Zang X F, Yao B S, Chen L et al. Metasurfaces for manipulating terahertz waves[J]. Light: Advanced Manufacturing, 2, 148-172(2021).
[3] Köhler R, Tredicucci A, Beltram F et al. Terahertz semiconductor-heterostructure laser[J]. Nature, 417, 156-159(2002).
[4] Nuss M C, Orenstein J. Terahertz time-domain spectroscopy[M]. Grüner G. Millimeter and submillimeter wave spectroscopy of solids. Topics in applied physics, 74, 7-50(2007).
[5] Veselago V G. The electrodynamics of substances with simultaneously negative values of ɛ and μ[J]. Soviet Physics Uspekhi, 10, 509-514(1968).
[6] Kildishev A V, Boltasseva A, Shalaev V M. Planar photonics with metasurfaces[J]. Science, 339, 1232009(2013).
[7] Grant J, McCrindle I J H, Li C et al. Multispectral metamaterial absorber[J]. Optics Letters, 39, 1227-1230(2014).
[8] Cao J H, Quan B G, Chen K L et al. Towards ultra-strong terahertz field enhancement in nanogap split ring resonators[C], WI12(2018).
[9] Wallauer J, Grumber C, Walther M. Mapping the coupling between a photo-induced local dipole and the eigenmodes of a terahertz metamaterial[J]. Optics Letters, 39, 6138-6141(2014).
[10] Yao J Q, Li J T, Zhang Y T et al. Bound states in continuum in periodic optical systems[J]. Chinese Optics, 16, 1-23(2023).
[11] Hsu C W, Zhen B, Stone A D et al. Bound states in the continuum[J]. Nature Reviews Materials, 1, 16048(2016).
[12] von Neumann J, Wigner E P. Uber merkwürdige diskrete eigenwerte. uber das verhalten von eigenwerten Bei adiabatischen prozessen[J]. Zhurnal Physik, 30, 467-470(1929).
[13] Every A G. Guided elastic waves at a periodic array of thin coplanar cavities in a solid[J]. Physical Review B, 78, 174104(2008).
[14] Friedrich H, Wintgen D. Interfering resonances and bound states in the continuum[J]. Physical Review A, 32, 3231-3242(1985).
[15] Linton C M, McIver P. Embedded trapped modes in water waves and acoustics[J]. Wave Motion, 45, 16-29(2007).
[16] Marinica D C, Borisov A G, Shabanov S V. Bound states in the continuum in photonics[J]. Physical Review Letters, 100, 183902(2008).
[17] Yang Y, Peng C, Liang Y et al. Analytical perspective for bound states in the continuum in photonic crystal slabs[J]. Physical Review Letters, 113, 037401(2014).
[18] Cong L Q, Singh R. Symmetry-protected dual bound states in the continuum in metamaterials[J]. Advanced Optical Materials, 7, 1900383(2019).
[19] Xiao S Y, Qin M B, Duan J Y et al. Polarization-controlled dynamically switchable high-harmonic generation from all-dielectric metasurfaces governed by dual bound states in the continuum[J]. Physical Review B, 105, 195440(2022).
[20] Zhao X G, Chen C X, Kaj K et al. Terahertz investigation of bound states in the continuum of metallic metasurfaces[J]. Optica, 7, 1548-1554(2020).
[21] Monticone F, Alù A. Embedded photonic eigenvalues in 3D nanostructures[J]. Physical Review Letters, 112, 213903(2014).
[22] Silveirinha M G. Trapping light in open plasmonic nanostructures[J]. Physical Review A, 89, 023813(2014).
[23] Sadrieva Z F, Sinev I S, Koshelev K L et al. Transition from optical bound states in the continuum to leaky resonances: role of substrate and roughness[J]. ACS Photonics, 4, 723-727(2017).
[24] Liu Z J, Xu Y, Lin Y et al. High-Q quasibound states in the continuum for nonlinear metasurfaces[J]. Physical Review Letters, 123, 253901(2019).
[25] Hsu C W, Zhen B, Lee J et al. Observation of trapped light within the radiation continuum[J]. Nature, 499, 188-191(2013).
[26] Hsiao H H, Hsu Y C, Liu A Y et al. Ultrasensitive refractive index sensing based on the quasi‐bound states in the continuum of all‐dielectric metasurfaces[J]. Advanced Optical Materials, 10, 2200812(2022).
[27] Koshelev K, Lepeshov S, Liu M K et al. Asymmetric metasurfaces with high-Q resonances governed by bound states in the continuum[J]. Physical Review Letters, 121, 193903(2018).
[28] Han S, Pitchappa P, Wang W H et al. Extended bound states in the continuum with symmetry-broken terahertz dielectric metasurfaces[J]. Advanced Optical Materials, 9, 2002001(2021).
[29] Yesilkoy F, Arvelo E R, Jahani Y et al. Ultrasensitive hyperspectral imaging and biodetection enabled by dielectric metasurfaces[J]. Nature Photonics, 13, 390-396(2019).
[30] Nguyen H, Dubois F, Deschamps T et al. Symmetry breaking in photonic crystals: on-demand dispersion from flatband to Dirac cones[J]. Physical Review Letters, 120, 066102(2018).
[31] Ma T, Huang Q P, He H C et al. All-dielectric metamaterial analogue of electromagnetically induced transparency and its sensing application in terahertz range[J]. Optics Express, 27, 16624-16634(2019).
[32] Zhong Y J, Du L H, Liu Q et al. All-silicon terahertz metasurface with sharp Fano resonance and its sensing applications[J]. IEEE Photonics Journal, 13, 4600210(2021).
[33] Wang J, Kühne J, Karamanos T et al. All‐dielectric crescent metasurface sensor driven by bound states in the continuum[J]. Advanced Functional Materials, 31, 2104652(2021).
[34] Wang P F, He F Y, Liu J J et al. Ultra-high-Q resonances in terahertz all-silicon metasurfaces based on bound states in the continuum[J]. Photonics Research, 10, 2743-2750(2022).
[35] Liu D, Yu X, Wu F et al. Terahertz high-Q quasi-bound states in the continuum in laser-fabricated metallic double-slit arrays[J]. Optics Express, 29, 24779-24791(2021).
[36] Niu J, Zhai Y, Han Q et al. Resonance-trapped bound states in the continuum in metallic THz metasurfaces[J]. Optics Letters, 46, 162-165(2021).
[37] Scalari G, Maissen C, Cibella S et al. High quality factor, fully switchable terahertz superconducting metasurface[J]. Applied Physics Letters, 105, 261104(2014).
[38] Cao W, Singh R, Al-Naib I A I et al. Low-loss ultra-high-Q dark mode plasmonic Fano metamaterials[J]. Optics Letters, 37, 3366-3368(2012).
[39] Srivastava Y K, Manjappa M, Cong L Q et al. Ultrahigh-Q Fano resonances in terahertz metasurfaces: strong influence of metallic conductivity at extremely low asymmetry[J]. Advanced Optical Materials, 4, 457-463(2016).
[40] Gupta M, Savinov V, Xu N N et al. Sharp toroidal resonances in planar terahertz metasurfaces[J]. Advanced Materials, 28, 8206-8211(2016).
[41] Kim M, Kee C S, Kim S. Graphene-based fine tuning of Fano resonance transmission of quasi-bound states in the continuum[J]. Optics Express, 30, 30666-30671(2022).
[42] Gao E D, Jin R, Fu Z C et al. Ultrawide dynamic modulation of perfect absorption with a Friedrich-Wintgen BIC[J]. Photonics Research, 11, 456-462(2023).
[43] Fan S H, Joannopoulos J D. Analysis of guided resonances in photonic crystal slabs[J]. Physical Review B, 65, 235112(2002).
[44] Lee J, Zhen B, Chua S L et al. Observation and differentiation of unique high-Q optical resonances near zero wave vector in macroscopic photonic crystal slabs[J]. Physical Review Letters, 109, 067401(2012).
[45] Zhang Y W, Chen A, Liu W Z et al. Observation of polarization vortices in momentum space[J]. Physical Review Letters, 120, 186103(2018).
[46] Zhen B, Hsu C W, Lu L et al. Topological nature of optical bound states in the continuum[J]. Physical Review Letters, 113, 257401(2014).
[47] Ye W M, Gao Y, Liu J L. Singular points of polarizations in the momentum space of photonic crystal slabs[J]. Physical Review Letters, 124, 153904(2020).
[48] Kang M, Mao L, Zhang S P et al. Merging bound states in the continuum by harnessing higher-order topological charges[J]. Light: Science & Applications, 11, 228(2022).
[49] Jin J C, Yin X F, Ni L F et al. Topologically enabled ultrahigh-Q guided resonances robust to out-of-plane scattering[J]. Nature, 574, 501-504(2019).
[50] Kang M, Zhang S P, Xiao M et al. Merging bound states in the continuum at off-high symmetry points[J]. Physical Review Letters, 126, 117402(2021).
[51] Hwang M S, Lee H C, Kim K H et al. Ultralow-threshold laser using super-bound states in the continuum[J]. Nature Communications, 12, 4135(2021).
[52] Liu W Z, Wang B, Zhang Y W et al. Circularly polarized states spawning from bound states in the continuum[J]. Physical Review Letters, 123, 116104(2019).
[53] Srivastava Y K, Ako R T, Gupta M et al. Terahertz sensing of 7 nm dielectric film with bound states in the continuum metasurfaces[J]. Applied Physics Letters, 115, 151105(2019).
[54] Chen X, Fan W H, Yan H. Toroidal dipole bound states in the continuum metasurfaces for terahertz nanofilm sensing[J]. Optics Express, 28, 17102-17112(2020).
[55] Chen X, Fan W H, Jiang X Q et al. High-Q toroidal dipole metasurfaces driven by bound states in the continuum for ultrasensitive terahertz sensing[J]. Journal of Lightwave Technology, 40, 2181-2190(2022).
[56] Wang Y L, Han Z H, Du Y et al. Ultrasensitive terahertz sensing with high-Q toroidal dipole resonance governed by bound states in the continuum in all-dielectric metasurface[J]. Nanophotonics, 10, 1295-1307(2021).
[57] Hentschel M, Schäferling M, Duan X Y et al. Chiral plasmonics[J]. Science Advances, 3, e1602735(2017).
[58] Chen Y, Deng H C, Sha X B et al. Observation of intrinsic chiral bound states in the continuum[J]. Nature, 613, 474-478(2023).
[59] Gorkunov M V, Antonov A A, Kivshar Y S. Metasurfaces with maximum chirality empowered by bound states in the continuum[J]. Physical Review Letters, 125, 093903(2020).
[60] Gorkunov M V, Antonov A A, Tuz V R et al. Bound states in the continuum underpin near-lossless maximum chirality in dielectric metasurfaces[J]. Advanced Optical Materials, 9, 2100797(2021).
[61] Overvig A, Yu N F, Alù A. Chiral quasi-bound states in the continuum[J]. Physical Review Letters, 126, 073001(2021).
[62] Shi T, Deng Z L, Geng G Z et al. Planar chiral metasurfaces with maximal and tunable chiroptical response driven by bound states in the continuum[J]. Nature Communications, 13, 4111(2022).
[63] Shen Z L, Fan S T, Yin W et al. Chiral metasurfaces with maximum circular dichroism enabled by out-of-plane plasmonic system[J]. Laser & Photonics Reviews, 16, 2200370(2022).
[64] Li J T, Yue Z, Li J et al. Ultra-narrowband terahertz circular dichroism driven by planar metasurface supporting chiral quasi bound states in continuum[J]. Optics & Laser Technology, 161, 109173(2023).
[65] Tang Y H, Liang Y, Yao J et al. Chiral bound states in the continuum in plasmonic metasurfaces[J]. Laser & Photonics Reviews, 17, 2200597(2023).
[66] Dixon J, Lawrence M, Barton D R et al. Self-isolated Raman lasing with a chiral dielectric metasurface[J]. Physical Review Letters, 126, 123201(2021).
[67] Solntsev A S, Agarwal G S, Kivshar Y S. Metasurfaces for quantum photonics[J]. Nature Photonics, 15, 327-336(2021).
[68] Fan Y B, Liang H, Li J et al. Emerging trend in unconventional metasurfaces: from nonlinear, non-Hermitian to nonclassical metasurfaces[J]. ACS Photonics, 9, 2872-2890(2022).
[69] Tittl A, Leitis A, Liu M K et al. Imaging-based molecular barcoding with pixelated dielectric metasurfaces[J]. Science, 360, 1105-1109(2018).
[70] Leitis A, Tittl A, Liu M K et al. Angle-multiplexed all-dielectric metasurfaces for broadband molecular fingerprint retrieval[J]. Science Advances, 5, eaaw2871(2019).
[71] Xie Y N, Ma Y J, Liu X Y et al. Dual-degree-of-freedom multiplexed metasensor based on quasi-BICs for boosting broadband trace isomer detection by THz molecular fingerprint[J]. IEEE Journal of Selected Topics in Quantum Electronics, 29, 8600110(2023).
[72] Sun M, Han Z H. Highly sensitive terahertz fingerprint sensing based on the quasi-guided modes in a distorted photonic lattice[J]. Optics Express, 31, 10947-10954(2023).
[73] Sun L, Xu L, Wang J Y et al. A pixelated frequency-agile metasurface for broadband terahertz molecular fingerprint sensing[J]. Nanoscale, 14, 9681-9685(2022).
[74] Liu X Y, Chen W, Ma Y J et al. Enhancing THz fingerprint detection on the planar surface of an inverted dielectric metagrating[J]. Photonics Research, 10, 2836-2845(2022).
[75] Zhou Y, Zheng H Y, Kravchenko I I et al. Flat optics for image differentiation[J]. Nature Photonics, 14, 316-323(2020).
[76] Li J T, Li J E, Zheng C L et al. Spectral amplitude modulation and dynamic near-field displaying of all-silicon terahertz metasurfaces supporting bound states in the continuum[J]. Applied Physics Letters, 119, 241105(2021).
[77] Cai H C, Li J T, Mao L H. Experimental implementation for near-field displaying application of bound states in continuum supported by terahertz metasurfaces[J]. Optics Express, 31, 2654-2664(2023).
[78] Fan K B, Shadrivov I V, Padilla W J. Dynamic bound states in the continuum[J]. Optica, 6, 169-173(2019).
[79] Han S, Cong L Q, Srivastava Y K et al. All-dielectric active terahertz photonics driven by bound states in the continuum[J]. Advanced Materials, 31, 1901921(2019).
