[1] M. Tonouchi. Cutting-edge terahertz technology. Nat. Photonics, 1, 97-105(2007).
[2] S. Koenig, D. Lopez-Diaz, J. Antes, F. Boes, R. Henneberger, A. Leuther, A. Tessmann, R. Schmogrow, D. Hillerkuss, R. Palmer, T. Zwick, C. Koos, W. Freude, O. Ambacher, J. Leuthold, I. Kallfass. Wireless sub-THz communication system with high data rate. Nat. Photonics, 7, 977-981(2013).
[3] X. Zang, W. Xu, M. Gu, B. Yao, L. Chen, Y. Peng, J. Xie, A. V. Balakin, A. P. Shkurinov, Y. Zhu, S. Zhuang. Polarization-insensitive metalens with extended focal depth and longitudinal high-tolerance imaging. Adv. Opt. Mater., 8, 1901342(2020).
[4] S. Zhong. Progress in terahertz nondestructive testing: a review. Front. Mech. Eng., 14, 273-281(2019).
[5] Y. Kawano. Terahertz sensing and imaging based on nanostructured semiconductors and carbon materials. Laser Photon. Rev., 6, 246-257(2012).
[6] P. U. Jepsen, D. G. Cooke, M. Koch. Terahertz spectroscopy and imaging–Modern techniques and applications. Laser Photon. Rev., 5, 124-166(2011).
[7] Y. Hu, T. Jiang, J. Zhou, H. Hao, H. Sun, H. Ouyang, M. Tong, Y. Tang, H. Li, J. You, X. Zheng, Z. Xu, X. Cheng. Ultrafast terahertz frequency and phase tuning by all-optical molecularization of metasurfaces. Adv. Opt. Mater., 7, 1970084(2019).
[8] T. Nagatsuma, G. Ducournau, C. C. Renaud. Advances in terahertz communications accelerated by photonics. Nat. Photonics, 10, 371-379(2016).
[9] X. C. Q. Yang, Q. Xu, C. Tian, Y. Xu, L. Cong, X. Zhang, Y. Li, C. Zhang, X. Zhang, J. Han, W. Zhang. Broadband terahertz rotator with an all-dielectric metasurface. Photon. Res., 6, 1056-1061(2018).
[10] Z. Chen, X. Chen, L. Tao, K. Chen, M. Long, X. Liu, K. Yan, R. I. Stantchev, E. Pickwell-MacPherson, J. B. Xu. Graphene controlled Brewster angle device for ultra broadband terahertz modulation. Nat. Commun., 9, 4909(2018).
[11] L. Cong, Y. K. Srivastava, H. Zhang, X. Zhang, J. Han, R. Singh. All-optical active THz metasurfaces for ultrafast polarization switching and dynamic beam splitting. Light Sci. Appl., 7, 28(2018).
[12] C. C. Chang, Z. Zhao, D. Li, A. J. Taylor, S. Fan, H. T. Chen. Broadband linear-to-circular polarization conversion enabled by birefringent off-resonance reflective metasurfaces. Phys. Rev. Lett., 123, 237401(2019).
[13] H.-T. Chen, W. J. Padilla, J. M. O. Zide, A. C. Gossard, A. J. Taylor, R. D. Averitt. Active terahertz metamaterial devices. Nature, 444, 597-600(2006).
[14] Z. Miao, Q. Wu, X. Li, Q. He, K. Ding, Z. An, Y. Zhang, L. Zhou. Widely tunable terahertz phase modulation with gate-controlled graphene metasurfaces. Phys. Rev. X, 5, 041027(2015).
[15] H.-T. Chen, J. F. O’Hara, A. K. Azad, A. J. Taylor, R. D. Averitt, D. B. Shrekenhamer, W. J. Padilla. Experimental demonstration of frequency-agile terahertz metamaterials. Nat. Photonics, 2, 295-298(2008).
[16] S. J. Kindness, N. W. Almond, B. Wei, R. Wallis, W. Michailow, V. S. Kamboj, P. Braeuninger-Weimer, S. Hofmann, H. E. Beere, D. A. Ritchie, R. Degl’Innocenti. Active control of electromagnetically induced transparency in a terahertz metamaterial array with graphene for continuous resonance frequency tuning. Adv. Opt. Mater., 6, 1800570(2018).
[17] S. Xiao, T. Wang, T. Liu, X. Yan, Z. Li, C. Xu. Active modulation of electromagnetically induced transparency analogue in terahertz hybrid metal-graphene metamaterials. Carbon, 126, 271-278(2018).
[18] S. Han, L. Cong, Y. K. Srivastava, B. Qiang, M. V. Rybin, A. Kumar, R. Jain, W. X. Lim, V. G. Achanta, S. S. Prabhu, Q. J. Wang, Y. S. Kivshar, R. Singh. All-dielectric active terahertz photonics driven by bound states in the continuum. Adv. Mater., 31, 1901921(2019).
[19] L. Cong, R. Singh. Symmetry-protected dual bound states in the continuum in metamaterials. Adv. Opt. Mater., 7, 1900383(2019).
[20] M. Liu, Z. Tian, X. Zhang, J. Gu, C. Ouyang, J. Han, W. Zhang. Tailoring the plasmon-induced transparency resonances in terahertz metamaterials. Opt. Express, 25, 19844-19855(2017).
[21] X. Chen, S. Ghosh, Q. Xu, C. Ouyang, Y. Li, X. Zhang, Z. Tian, J. Gu, L. Liu, A. K. Azad, J. Han, W. Zhang. Active control of polarization-dependent near-field coupling in hybrid metasurfaces. Appl. Phys. Lett., 113, 061111(2018).
[22] J. Gu, R. Singh, X. Liu, X. Zhang, Y. Ma, S. Zhang, S. A. Maier, Z. Tian, A. K. Azad, H.-T. Chen, A. J. Taylor, J. Han, W. Zhang. Active control of electromagnetically induced transparency analogue in terahertz metamaterials. Nat. Commun., 3, 1151(2012).
[23] T.-T. Kim, H.-D. Kim, R. Zhao, S. S. Oh, T. Ha, D. S. Chung, Y. H. Lee, B. Min, S. Zhang. Electrically tunable slow light using graphene metamaterials. ACS Photon., 5, 1800-1807(2018).
[24] Y. Hu, T. Jiang, J. Zhou, H. Hao, H. Sun, H. Ouyang, M. Tong, Y. Tang, H. Li, J. You, X. Zheng, Z. Xu, X. Cheng. Ultrafast terahertz transmission/group delay switching in photoactive WSe2-functionalized metaphotonic devices. Nano Energy, 68, 104280(2020).
[25] Y. K. Srivastava, A. Chaturvedi, M. Manjappa, A. Kumar, G. Dayal, C. Kloc, R. Singh. MoS2 for ultrafast all-optical switching and modulation of THz Fano metaphotonic devices. Adv. Opt. Mater., 5, 1700762(2017).
[26] A. Kumar, A. Solanki, M. Manjappa, S. Ramesh, Y. K. Srivastava, P. Agarwal, T. C. Sum, R. Singh. Excitons in 2D perovskites for ultrafast terahertz photonic devices. Sci. Adv., 6, eaax8821(2020).
[27] M. Manjappa, Y. K. Srivastava, A. Solanki, A. Kumar, T. C. Sum, R. Singh. Hybrid lead halide perovskites for ultrasensitive photoactive switching in terahertz metamaterial devices. Adv. Mater., 29, 1605881(2017).
[28] Y. Hu, J. You, M. Tong, X. Zheng, Z. Xu, X. Cheng, T. Jiang. Pump-color selective control of ultrafast all-optical switching dynamics in metaphotonic devices. Adv. Sci., 7, 2000799(2020).
[29] W. X. Lim, M. Manjappa, Y. K. Srivastava, L. Cong, A. Kumar, K. F. MacDonald, R. Singh. Ultrafast all-optical switching of germanium-based flexible metaphotonic devices. Adv. Mater., 30, 1705331(2018).
[30] H. J. Joyce, J. L. Boland, C. L. Davies, S. A. Baig, M. B. Johnston. A review of the electrical properties of semiconductor nanowires: insights gained from terahertz conductivity spectroscopy. Semicond. Sci. Technol., 31, 103003(2016).
[31] J. S. Jensen, O. Sigmund. Topology optimization for nano-photonics. Laser Photon. Rev., 5, 308-321(2011).
[32] M. Minkov, I. A. D. Williamson, L. C. Andreani, D. Gerace, B. Lou, A. Y. Song, T. W. Hughes, S. Fan. inverse design of photonic crystals through automatic differentiation. ACS Photon., 7, 1729-1741(2020).
[33] D. Sell, J. Yang, S. Doshay, R. Yang, J. A. Fan. Large-angle, multifunctional metagratings based on freeform multimode geometries. Nano Lett., 17, 3752-3757(2017).
[34] C. Sitawarin, W. Jin, Z. Lin, A. W. Rodriguez. Inverse-designed photonic fibers and metasurfaces for nonlinear frequency conversion [invited]. Photon. Res., 6, B82-B89(2018).
[35] W. Ma, F. Cheng, Y. Xu, Q. Wen, Y. Liu. Probabilistic representation and inverse design of metamaterials based on a deep generative model with semi-supervised learning strategy. Adv. Mater., 31, 1901111(2019).
[36] Y. Chen, Y. Hu, J. Zhao, Y. Deng, Z. Wang, X. Cheng, D. Lei, Y. Deng, H. Duan. Topology optimization-based inverse design of plasmonic nanodimer with maximum near-field enhancement. Adv. Funct. Mater., 30, 2000642(2020).
[37] A. Y. Piggott, J. Lu, K. G. Lagoudakis, J. Petykiewicz, T. M. Babinec, J. Vučković. Inverse design and demonstration of a compact and broadband on-chip wavelength demultiplexer. Nat. Photonics, 9, 374-377(2015).
[38] L. Su, A. Y. Piggott, N. V. Sapra, J. Petykiewicz, J. Vučković. Inverse design and demonstration of a compact on-chip narrowband three-channel wavelength demultiplexer. ACS Photon., 5, 301-305(2018).
[39] B. Shen, P. Wang, R. Polson, R. Menon. An integrated-nanophotonics polarization beamsplitter with 2.4 × 2.4 μm2 footprint. Nat. Photonics, 9, 378-382(2015).
[40] S. Y. Y. Zhang, A. E.-J. Lim, G.-Q. Lo, C. Galland, T. Baehr-Jones, M. Hochberg. A compact and low loss Y-junction for submicron silicon waveguide. Opt. Express, 21, 1310-1316(2013).
[41] B. Shen, P. Wang, R. Polson, R. Menon. Ultra-high-efficiency metamaterial polarizer. Optica, 1, 356-360(2014).
[42] S. So, T. Badloe, J. Noh, J. Rho, J. Bravo-Abad. Deep learning enabled inverse design in nanophotonics. Nanophotonics, 9, 1041-1057(2020).
[43] S. Molesky, Z. Lin, A. Y. Piggott, W. Jin, J. Vucković, A. W. Rodriguez. Inverse design in nanophotonics. Nat. Photonics, 12, 659-670(2018).
[44] L. Su, D. Vercruysse, J. Skarda, N. V. Sapra, J. A. Petykiewicz, J. Vučković. Nanophotonic inverse design with SPINS: software architecture and practical considerations. Appl. Phys. Rev., 7, 011407(2020).
[45] W. Ma, F. Cheng, Y. Liu. Deep-learning-enabled on-demand design of chiral metamaterials. ACS Nano, 12, 6326-6334(2018).
[46] M. D. Huntington, L. J. Lauhon, T. W. Odom. Subwavelength lattice optics by evolutionary design. Nano Lett., 14, 7195-7200(2014).
[47] Z. Lin, X. Liang, M. Lončar, S. G. Johnson, A. W. Rodriguez. Cavity-enhanced second-harmonic generation via nonlinear-overlap optimization. Optica, 3, 233-238(2016).
[48] J. C. Mak, C. Sideris, J. Jeong, A. Hajimiri, J. K. Poon. Binary particle swarm optimized 2 x 2 power splitters in a standard foundry silicon photonic platform. Opt. Lett., 41, 3868-3871(2016).
[49] T. Nakanishi, Y. Nakata, Y. Urade, K. Okimura. Broadband operation of active terahertz quarter-wave plate achieved with vanadium-dioxide-based metasurface switchable by current injection. Appl. Phys. Lett., 117, 091102(2020).
[50] D. Wang, L. Zhang, Y. Gong, L. Jian, T. Venkatesan, C. Qiu, M. Hong. Multiband switchable terahertz quarter-wave plates via phase-change metasurfaces. IEEE Photon. J., 8, 5500308(2016).
[51] D. Wang, L. Zhang, Y. Gu, M. Q. Mehmood, Y. Gong, A. Srivastava, L. Jian, T. Venkatesan, C.-W. Qiu, M. Hong. Switchable ultrathin quarter-wave plate in terahertz using active phase-change metasurface. Sci. Rep., 5, 15020(2015).
[52] M. Manjappa, A. Solanki, A. Kumar, T. C. Sum, R. Singh. Solution-processed lead iodide for ultrafast all-optical switching of terahertz photonic devices. Adv. Mater., 31, 1901455(2019).
[53] S. Zhang, D. A. Genov, Y. Wang, M. Liu, X. Zhang. Plasmon-induced transparency in metamaterials. Phys. Rev. Lett., 101, 047401(2008).
[54] P. Tassin, L. Zhang, R. Zhao, A. Jain, T. Koschny, C. M. Soukoulis. Electromagnetically induced transparency and absorption in metamaterials: the radiating two-oscillator model and its experimental confirmation. Phys. Rev. Lett., 109, 187401(2012).
[55] R. Eberhart, J. Kennedy. A new optimizer using particle swarm theory. Proceedings of the Sixth International Symposium on Micro Machine and Human Science (MHS’95), 39-43(1995).
[56] D.-C. Wang, R. Tang, Z. Feng, S. Sun, S. Xiao, W. Tan. Symmetry-assisted spectral line shapes manipulation in dielectric double-Fano metasurfaces. Adv. Opt. Mater., 9, 2001874(2021).
[57] D.-C. Wang, S. Sun, Z. Feng, W. Tan, C.-W. Qiu. Multipolar-interference-assisted terahertz waveplates via all-dielectric metamaterials. Appl. Phys. Lett., 113, 201103(2018).
[58] T. W. Hughes, M. Minkov, I. A. D. Williamson, S. Fan. Adjoint method and inverse design for nonlinear nanophotonic devices. ACS Photon., 5, 4781-4787(2018).
[59] Z. Tao, J. You, J. Zhang, X. Zheng, H. Liu, T. Jiang. Optical circular dichroism engineering in chiral metamaterials utilizing a deep learning network. Opt. Lett., 45, 1403-1406(2020).
[60] Z. Tao, J. Zhang, J. You, H. Hao, H. Ouyang, Q. Yan, S. Du, Z. Zhao, Q. Yang, X. Zheng, T. Jiang. Exploiting deep learning network in optical chirality tuning and manipulation of diffractive chiral metamaterials. Nanophotonics, 9, 2945-2956(2020).
[61] S. Du, J. You, J. Zhang, Z. Tao, H. Hao, Y. Tang, X. Zheng, T. Jiang. Expedited circular dichroism prediction and engineering in two-dimensional diffractive chiral metamaterials leveraging a powerful model-agnostic data enhancement algorithm. Nanophotonics, 10, 20200570(2020).
[62] M. ElKabbash, A. R. Rashed, B. Kucukoz, Q. Nguyen, A. Karatay, G. Yaglioglu, E. Ozbay, H. Caglayan, G. Strangi. Ultrafast transient optical loss dynamics in exciton–plasmon nano-assemblies. Nanoscale, 9, 6558-6566(2017).
