[1] CROWE T W, BISHOP W L, PORTERFIELD D W, et al. Opening the terahertz window with integrated diode circuits[J]. IEEE Journal of Solid-State Circuits, 2005, 40(10): 2104-2110.
[2] APPLEBY R, ANDERTON R N. Millimeter-wave and submillimeter-
[5] CHEN H T, PADILLA W J, ZIDE J M O, et al. Active terahertz metamaterial devices[J]. Nature, 2006, 444(6): 783-790.
[6] YOHAN L, SUN-JE K, HYEONSOO P, et al. Metamaterials and metasurfaces for sensor applications[J]. Sensors, 2017, 17(8): 1708-1726.
[7] LI C Y, CHANG C C, ZHOU Q L, et al. Resonance coupling and polarization conversion in terahertz metasurfaces with twisted split-ring resonator pairs[J]. Optics Express, 2017, 25(21): 25842-25852.
[8] CHENG X M, HUANG R, XU J, et al. Broadband terahertz near-perfect absorbers[J]. ACS Applied Materials & Interfaces, 2020, 12(29): 33352-33360.
[9] VERMA V K, MISHRA S K, KAUSHAL K K, et al. An octaband polarization insensitive terahertz metamaterial absorber using orthogonal elliptical ring resonators[J]. Plasmonics, 2020, 15(1):75-81.
[12] WANG B X, WANG G Z. Quad-band terahertz absorber based on dipolar resonances of metamaterial resonator[J]. Plasmonics, 2017, 13(3): 1097-1103.
[13] MOHANTY A, ACHARYA O P, APPASANI B, et al. A multi-band terahertz metamaterial absorber based on a π and u-shaped structure[J]. Photonics and Nanostructures-Fundamentals and Applications, 2018, 32:74-80.
[14] WANG B X, ZHAI X, WANG G Z, et al. Design of a four-band and polarization-insensitive terahertz metamaterial absorber[J]. IEEE Photonics Journal, 2015, 7(1): 1-8.
[15] JIA W, BAI J, ROBERTS K, et al. Design and simulation of a polarization-insensitive metamaterial terahertz absorber with five bands[J].Microwave and Optical Technolgy Letters, 2020, 62(8): 2649-2655.
[16] SMITH D R, DALICHAOUCH R, KNOLL N, et al. Photonic band-structure and defects in one and 2 dimensions[J]. Journal of the Optical Society of America B, 1993, 10(2): 314-321.
[18] POZAR D M. Microwave engineering fourth edition[M]. New York: John Wiley & Sons Inc, 2012.