[1] ZEL'DOVICH I B. Electromagnetic interaction with parity violation[J]. Soviet Journal of Experimental and Theoretical Physics, 6, 1184(1958).

[2] DONG Z G, NI P G, ZHU J, et al. Toroidal dipole response in a multifold double-ring metamaterial[J]. Optics Express, 20, 13065-13070(2012).

[3] PAPASIMAKIS N, FEDOTOV V A, SAVINOV V, et al. Electromagnetic toroidal excitations in matter and free space[J]. Nature Materials, 15, 263-271(2016).

[4] SAYANSKIY A, DANAEIFAR M, KAPITANOVA P, et al. All-dielectric metalattice with enhanced toroidal dipole response[J]. Advanced Optical Materials, 6, 1800302(2018).

[5] GUO L Y, LI M H, YE Q W, et al. Electric toroidal dipole response in split-ring resonator metamaterials[J]. The European Physical Journal B, 85, 208(2012).

[6] STENISHCHEV I V, BASHARIN A A. Toroidal response in all-dielectric metamaterials based on water[J]. Scientific Reports, 7, 9468(2017).

[7] LIU W, ZHANG J F, MIROSHNICHENKO A E. Toroidal dipole-induced transparency in core-shell nanoparticles[J]. Laser & Photonics Reviews, 9, 564-570(2015).

[8] YE Q W, GUO L Y, LI M H, et al. The magnetic toroidal dipole in steric metamaterial for permittivity sensor application[J]. Physica Scripta, 88, 055002(2013).

[9] LI J, WANG Y H, JIN R C, et al. Toroidal-dipole induced plasmonic perfect absorber[J]. Journal of Physics D:Applied Physics, 50, 485301(2017).

[10] CHEN L, LIAO D G, GUO X G, et al. Terahertz time-domain spectroscopy and micro-cavity components for probing samples: a review[J]. Frontiers of Information Technology & Electronic Engineering, 20, 591-607(2019).

[11] CHEN L, ZHU Y M, ZANG X F, et al. Mode splitting transmission effect of surface wave excitation through a metal hole array[J]. Light:Science & Applications, 2, e60(2013).

[12] BASHARIN A A, CHUGUEVSKY V, VOLSKY N, et al. Extremely high Q-factor metamaterials due to anapole excitation[J]. Physical Review B, 95, 035104(2017).

[13] WU P C, LIAO C Y, SAVINOV V, et al. Optical anapole metamaterial[J]. ACS Nano, 12, 1920-1927(2018).

[14] MARINOV K, BOARDMAN A D, FEDOTOV V A, et al. Toroidal metamaterial[J]. New Journal of Physics, 9, 324(2007).

[15] KAELBERER T, FEDOTOV V A, PAPASIMAKIS N, et al. Toroidal dipolar response in a metamaterial[J]. Science, 330, 1510-1512(2010).

[16] HUANG Y W, CHEN W T, WU P C, et al. Design of plasmonic toroidal metamaterials at optical frequencies[J]. Optics Express, 20, 1760-1768(2012).

[17] SONG Z Y, DENG Y D, ZHOU Y G, et al. Terahertz toroidal metamaterial with tunable properties[J]. Optics Express, 27, 5792-5797(2019).

[18] DONG Z G, ZHU J, RHO J, et al. Optical toroidal dipolar response by an asymmetric double-bar metamaterial[J]. Applied Physics Letters, 101, 144105(2012).

[19] ÖGÜT B, TALEBI N, VOGELGESANG R, et al. Toroidal plasmonic eigenmodes in oligomer nanocavities for the visible[J]. Nano Letters, 12, 5239-5244(2012).

[20] LIU W, ZHANG J F, LEI B, et al. Invisible nanowires with interfering electric and toroidal dipoles[J]. Optics Letters, 40, 2293-2296(2015).

[21] BASHARIN A A, KAFESAKI M, ECONOMOU E N, et al. Dielectric metamaterials with toroidal dipolar response[J]. Physical Review X, 5, 011036(2015).

[22] FEDOTOV V A, ROGACHEVA A V, SAVINOV V, et al. Resonant transparency and non-trivial non-radiating excitations in toroidal metamaterials[J]. Scientific Reports, 3, 2967(2013).

[23] CHEN L, WEI Y M, ZANG X F, et al. Excitation of dark multipolar plasmonic resonances at terahertz frequencies[J]. Scientific Reports, 6, 22027(2016).

[24] CHEN L, XU N N, SINGH L, et al. Defect-induced fano resonances in corrugated plasmonic metamaterials[J]. Advanced Optical Materials, 5, 1600960(2017).

[25] CHEN L, GE Y F, ZANG X F, et al. Tunable phase transition via radiative loss controlling in a terahertz attenuated total reflection-based metasurface[J]. IEEE Transactions on Terahertz Science and Technology, 9, 643-650(2019).

[26] ZHOU J, CHEN L, SUN Q Y, et al. Terahertz on-chip sensing by exciting higher radial order spoof localized surface plasmons[J]. Applied Physics Express, 13, 012014(2020).

[27] SHEN W W, XIE J Y, ZANG X F, et al. Coupling terahertz wave into a plasmonic waveguide by using two ribbon waveguides[J]. Results in Physics, 19, 103653(2020).

[28] QIN P F, YANG Y H, MUSA M Y, et al. Toroidal localized spoof plasmons on compact metadisks[J]. Advanced Science, 5, 1700487(2018).

[29] SUN B, YU Y Y. Double toroidal spoof localized surface plasmon resonance excited by two types of coupling mechanisms[J]. Optics Letters, 44, 1444-1447(2019).

[30] SUN B, YU Y Y, ZHANG S, et al. Propagation of toroidal localized spoof surface plasmons using conductive coupling[J]. Optics Letters, 44, 3861-3864(2019).