Detection of amino acid with metamaterial perfect absorbers in the terahertz band

Polarization-insensitive metamaterial perfect absorber in near-infrared band based on trapezoidal silver array

“…MPA was first proposed by Landy et al [19], and the structure has an absorption close to 100% at 11.5 GHz. Since then, MPA has developed rapidly with continuous research efforts [20][21][22][23][24], from single-frequency to multi-frequency, polarization-sensitive to polarization-insensitive and narrowband to broadband MPA. Moreover, it has been developed to the full spectral range, such as microwave [25][26][27], terahertz [28][29][30][31], visible [32][33][34][35] and infrared [36][37][38][39][40].…”

A dual ultra-broadband switchable high-performance terahertz absorber based on hybrid graphene and vanadium dioxide

“…4,5 In recent years, metamaterials have been widely used in terahertz functional devices, [6][7][8][9] which can well realize active control of electromagnetic waves in the terahertz region. Terahertz absorbers based on metamaterials have attracted much attention due to their potential applications in detection, 10 switching, 11 sensing [12][13][14] and filtering. 15 During the past few years, dynamically tunable terahertz functional devices have become a popular research topic, for example, the realization of asymmetric transmission and the thermal switching of circular dichroism, 16 the realization of asymmetric transmission and polarization conversion, 17 and the switching of broadband absorption and sensing.…”

“…4,5 In recent years, metamaterials have been widely used in terahertz functional devices, 6–9 which can well realize active control of electromagnetic waves in the terahertz region. Terahertz absorbers based on metamaterials have attracted much attention due to their potential applications in detection, 10 switching, 11 sensing 12–14 and filtering. 15…”

Study on qualitative identification of aflatoxin solution based on terahertz metamaterial enhancement

“…Wang et al 23 used an all-metal metamaterial terahertz biosensor for the detection of bovine serum proteins in 2021, and the detection limit was 0.035 mg ml −1 . In 2022, Zhu et al 24 proposed a metamaterial sensor composed of a graphene four-open square ring and a golden hemisphere, and combined with THz-TDS technology to identify four amino acids of proline, glycine, arginine and methionine, and the recognition accuracy reached 100%. In 2022, Hu et al 25 designed a terahertz enhanced metamaterial absorber based on the electromagnetic theory and applied it to the effective detection of benzoic acid samples.…”