[2] Siegel P H. Terahertz technology[J]. IEEE Trans. Microwave Theory Tech., 2002, 50(3): 910-928.
[3] Schmuttenmaer C A. Exploring dynamics in the far-infrared with terahertz spectroscopy[J]. Chem. Rev., 2004, 35(24): 1759-1780.
[4] Chen H T, Padilla W J, Cich M J, et al. A metamaterial solid-state terahertz phase modulator[J]. Nat. Photonics, 2009, 3(3): 148-151.
[5] Mller L, Federici J, Sinyukov A, et al. Data encoding on terahertz signals for communication and sensing[J]. Opt. Lett., 2008, 33(4): 393-395.
[6] Chan W L, Chen H T, Taylor A J, et al. A spatial light modulator for terahertz beams[J]. Appl. Phys. Lett., 2009, 94(21): 213511.
[8] Hashemi M R, Cakmakyapan S, Jarrahi M. Reconfigurable metamaterials for terahertz wave manipulation[J]. Rep. Prog. Phys., 2017, 80(9): 094501.
[9] Smith D R, Pendry J B, Wiltshire M C K. Metamaterials and negative refractive index[J]. Science, 2004, 305(5685): 788-792.
[10] Pendry J B. Negative refraction makes a perfect lens[J]. Phys. Rev. Lett., 2000, 85(18): 3966-3969.
[11] Zhao G, Bi S, Niu M, et al. A zero refraction metamaterial and its application in electromagnetic stealth cloak[J]. Mater. Today Commun., 2019, 21: 100603.
[12] Chen H T, Padilla W J, Zide J M O, et al. Active terahertz metamaterial devices[J]. Nature, 2006, 444(7119): 597-600.
[13] Shrekenhamer D, Rout S, Strikwerda A C, et al. High speed terahertz modulation from metamaterials with embedded high electron mobility transistors[J]. Opt. Express, 2011, 19(10): 9968-9975.
[14] Zhang X, Xing Y, Zhang Q, et al. High speed terahertz modulator based on the single channel AlGaN/GaN high electron mobility transistor[J]. Solid-State Electron., 2018, 146: 9-12.
[15] Zhang Y, Qiao S, Liang S, et al. Gbps terahertz external modulator based on a composite metamaterial with a double-channel heterostructure[J]. Nano Lett., 2015, 15(5): 3501-3506.