[1] Hernaez M, Acevedo B, Mayes A G et al. High-performance optical fiber humidity sensor based on lossy mode resonance using a nanostructured polyethylenimine and graphene oxide coating[J]. Sensors and Actuators B: Chemical, 286, 408-414(2019).

[2] Qiao S Q. Humidity sensor based on fiber grating coated with graphene oxide[J]. Journal of Physics: Conference Series, 1213, 042076(2019).

[3] Lo Presti D, Massaroni C, Schena E. Optical fiber gratings for humidity measurements: a review[J]. IEEE Sensors Journal, 18, 9065-9074(2018).

[4] Tételin A, Pellet C, Laville C et al. Fast response humidity sensors for a medical microsystem[J]. Sensors and Actuators B: Chemical, 91, 211-218(2003).

[5] Hansel N N, McCormack M C, Kim V. The effects of air pollution and temperature on COPD[J]. Journal of Chronic Obstructive Pulmonary Disease, 13, 372-379(2016).

[6] Silverberg J I, Hanifin J, Simpson E L. Climatic factors are associated with childhood eczema prevalence in the United States[J]. Journal of Investigative Dermatology, 133, 1752-1759(2013).

[7] Wang S J, Xia L P, Mao H Y et al. Terahertz biosensing based on a polarization-insensitive metamaterial[J]. IEEE Photonics Technology Letters, 28, 986-989(2016).

[8] Shelby R A, Smith D R, Schultz S. Experimental verification of a negative index of refraction[J]. Science, 292, 77-79(2001).

[9] Xu T, Agrawal A, Abashin M et al. All-angle negative refraction and active flat lensing of ultraviolet light[J]. Nature, 497, 470-474(2013).

[10] Zhou W, Chen J, Li H et al. Progress of electromagnetic metamaterial perfect absorber based on terahertz band[J]. Laser & Optoelectronics Progress, 59, 1100006(2022).

[11] Zhang T, Yang S, Yu X Y. Tunable broadband terahertz perfect absorber design based on vanadium dioxide[J]. Laser & Optoelectronics Progress, 58, 2116002(2021).

[12] Fang A L, Dai X Y, Ling X H et al. Metamaterials at terahertz and their applications[J]. Laser & Optoelectronics Progress, 47, 051601(2010).

[13] Schurig D, Mock J J, Justice B J et al. Metamaterial electromagnetic cloak at microwave frequencies[J]. Science, 314, 977-980(2006).

[14] O’Hara J F, Singh R, Brener I et al. Thin-film sensing with planar terahertz metamaterials: sensitivity and limitations[J]. Optics Express, 16, 1786-1795(2008).

[15] Zhao Z Y, Zhao H, Ako R T et al. Polarization-insensitive terahertz spoof localized surface plasmon-induced transparency based on lattice rotational symmetry[J]. Applied Physics Letters, 117, 011105(2020).

[16] Wang L, Zhao Z Y, Du M J et al. Tuning symmetry-protected quasi bound state in the continuum using terahertz meta-atoms of rotational and reflectional symmetry[J]. Optics Express, 30, 23631-23639(2022).

[17] Wang L, Zhao Z Y, Du M J et al. Polarization insensitive symmetry protected quasi-bound states in the continuum at terahertz band[J]. Journal of Applied Physics, 130, 233102(2021).

[18] Wang L, Zhao Z Y, Ako R T et al. Terahertz superlattice modes in Moiré metasurface composed of twisted square and hexagonal lattices[J]. Applied Physics Express, 14, 062003(2021).

[19] Kim Y H, Jang K, Yoon Y J et al. A novel relative humidity sensor based on microwave resonators and a customized polymeric film[J]. Sensors and Actuators B: Chemical, 117, 315-322(2006).

[20] Amin E M, Karmakar N C, Winther-Jensen B. Polyvinyl-alcohol (PVA)-based RF humidity sensor in microwave frequency[J]. Progress in Electromagnetics Research B, 54, 149-166(2013).

[21] Shin H J, Kim S H, Park K et al. Free-standing guided-mode resonance humidity sensor in terahertz[J]. Sensors and Actuators A: Physical, 268, 27-31(2017).

[22] Kim H S, Cha S H, Roy B et al. Humidity sensing using THz metamaterial with silk protein fibroin[J]. Optics Express, 26, 33575-33581(2018).

[23] Omenetto F G, Kaplan D L. New opportunities for an ancient material[J]. Science, 329, 528-531(2010).

[24] Diao Y Y, Liu X Y, Toh G W et al. Multiple structural coloring of silk-fibroin photonic crystals and humidity-responsive color sensing[J]. Advanced Functional Materials, 23, 5373-5380(2013).

[25] Li Q S, Qi N, Peng Y et al. Sub-micron silk fibroin film with high humidity sensibility through color changing[J]. RSC Advances, 7, 17889-17897(2017).

[26] Luo Y, Pei Y C, Feng X M et al. Silk fibroin based transparent and wearable humidity sensor for ultra-sensitive respiration monitoring[J]. Materials Letters, 260, 126945(2020).

[27] Tao H, Amsden J J, Strikwerda A C et al. Metamaterial silk composites at terahertz frequencies[J]. Advanced Materials, 22, 3527-3531(2010).

[28] Zheng Y Q, Wang L L, Zhao L J et al. A flexible humidity sensor based on natural biocompatible silk fibroin films[J]. Advanced Materials Technologies, 6, 2001053(2021).

[29] Ronne C, Thrane L, Åstrand P O et al. Investigation of the temperature dependence of dielectric relaxation in liquid water by THz reflection spectroscopy and molecular dynamics simulation[J]. Journal of Chemical Physics, 107, 5319-5331(1997).

[30] Sersic I, Frimmer M, Verhagen E et al. Electric and magnetic dipole coupling in near-infrared split-ring metamaterial arrays[J]. Physical Review Letters, 103, 213902(2009).

[31] 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).

[32] Wang G Q, Zhu F J, Lang T T et al. All-metal terahertz metamaterial biosensor for protein detection[J]. Nanoscale Research Letters, 16, 109(2021).

[33] Lin S J, Xu X L, Hu F R et al. Using antibody modified terahertz metamaterial biosensor to detect concentration of carcinoembryonic antigen[J]. IEEE Journal of Selected Topics in Quantum Electronics, 27, 6900207(2021).

[34] Ye Y X, Zhang Y X, Zhao Y et al. Sensitivity influencing factors during pesticide residue detection research via a terahertz metasensor[J]. Optics Express, 29, 15255-15268(2021).

[35] Wang Z Y, Geng Z X, Fang W H. Exploring performance of THz metamaterial biosensor based on flexible thin-film[J]. Optics Express, 28, 26370-26384(2020).

[36] Li D X, Hu F R, Zhang H P et al. Identification of early-stage cervical cancer tissue using metamaterial terahertz biosensor with two resonant absorption frequencies[J]. IEEE Journal of Selected Topics in Quantum Electronics, 27, 8600107(2021).

[37] Navarro-Cía M, Melzer J E, Harrington J A et al. Silver-coated teflon tubes for waveguiding at 1-2 THz[J]. Journal of Infrared, Millimeter, and Terahertz Waves, 36, 542-555(2015).