[2] [2] ENGHETA N, ZIOLKOWSKI R W. Metamaterials: physics and engineering explorations［M］. Hoboken, NJ: Wiley-Interscience, 2006.

[3] [3] SUZUKI T, KONDOH S. Negative refractive index metasurface in the 20-THz band［J］. Optical Materials Express, 2018, 8(7): 1916.

[4] [4] YIN S, CHEN Y T, QUAN B G, et al. Coupling-enabled chirality in terahertz metasurfaces［J］. Nanophotonics, 2023, 12(7): 1317-1326.

[5] [5] PENDRY J B, HOLDEN A J, STEWART W J, et al. Extremely low frequency plasmons in metallic mesostructures［J］. Physical Review Letters, 1996, 76(25): 4773-4776.

[6] [6] SMITH D R, SCHULTZ S, MARKO P, et al. Determination of effective permittivity and permeability of metamaterials from reflection and transmission coefficients［J］. Physical Review B, 2002, 65(19): 195104.

[7] [7] YANG S Y, LIU Z, XIA X X, et al. Excitation of ultrasharp trapped-mode resonances in mirror-symmetric metamaterials［J］. Physical Review B, 2016, 93(23): 235407.

[9] [9] MIROSHNICHENKO, FLACH, KIVSHAR. Fano resonances in nanoscale structures［J］. Reviews of Modern Physics, 2010, 82(3): 2257-2298.

[10] [10] LUK′YANCHUK B, ZHELUDEV N I, MAIER S A, et al. The fano resonance in plasmonic nanostructures and metamaterials［J］. Nature Materials, 2010, 9(9): 707-715.

[11] [11] FEDOTOV V A, ROSE M, PROSVIRNIN S L, et al. Sharp trapped-mode resonances in planar metamaterials with a broken structural symmetry［J］. Physical Review Letters, 2007, 99(14): 147401.

[12] [12] SINGH R, AL-NAIB I A I, KOCH M, et al. Sharp fano resonances in THz metamaterials［J］. Optics Express, 2011, 19(7): 6312.

[13] [13] CHEN M, SINGH L, XU N N, et al. Terahertz sensing of highly absorptive water-methanol mixtures with multiple resonances in metamaterials［J］. Optics Express, 2017, 25(13): 14089.

[14] [14] GUO K, ZHANG Y L, QIAN C, et al. Electric dipole-quadrupole hybridization induced enhancement of second-harmonic generation in T-shaped plasmonic heterodimers［J］. Optics Express, 2018, 26(9): 11984.

[15] [15] DICKEN M J, AYDIN K, PRYCE I M, et al. Frequency tunable near-infrared metamaterials based on VO2 phase transition［J］. Optics Express, 2009, 17(20): 18330.

[16] [16] SMSON Z L, MACDONALD K F, DE ANGELIS F, et al. Metamaterial electro-optic switch of nanoscale thickness［J］. Applied Physics Letters, 2010, 96(14): 143105.

[17] [17] NIKOLAENKO A E, DE ANGELIS F, BODEN S A, et al. Carbon nanotubes in a photonic metamaterial: giant ultrafast nonlinearity through plasmon-exciton coupling［C］//Conference on Lasers and Electro-Optics 2010. San Jose, CA. Washington, D.C.: OSA, 2010.

[19] [19] KAZANTZIS P G, DESINIOTIS C D. Four dipole problem equilibrium configurations［J］. Astrophysics and Space Science, 2000, 274(4): 819-836.

[20] [20] KAZANTZIS P G, DESINIOTIS C D. Planar symmetric periodic orbits in four dipole problem［J］. Astrophysics and Space Science, 2005, 295(3): 339-362.

[21] [21] YU B, ZENG F, YANG Y, et al. Torsional vibrational modes of tryptophan studied by terahertz time-domain spectroscopy［J］. Biophysical Journal, 2004, 86(3): 1649-1654.

[22] [22] YAHIAOUI R, STRIKWERDA A C, JEPSEN P U. Terahertz plasmonic structure with enhanced sensing capabilities［J］. IEEE Sensors Journal, 2016, 16(8): 2484-2488.