Tunable high-sensitivity sensing detector based on Bulk Dirac semimetal

Abstract

We propose a tunable narrow-band sensing detector with an Au-polyimide-Dirac semimetal structure. Simulations show >99.8% absorptivity at 2.4–5.2 THz. The sensor has active tunability, high refractive index sensitivity, angle insensitivity, and good sensing performance.

High confidence plasmonic sensor based on photonic crystal fibers with a U-shaped detection channel

“…The movement of the peak position can inverse solve the cause of the change of the medium in contact with the surface of the gold layer. 39,40…”

“…The movement of the peak position can inverse solve the cause of the change of the medium in contact with the surface of the gold layer. 39,40 During the simulation, the RI of air can be approximated as 1 and the dielectric function of gold can be expressed by the Drude-Lorentz model as: 41 eðoÞ…”

Active tunable terahertz bandwidth absorber based on single layer graphene

“…Tunable metamaterials are an important component of various optical devices but these materials are extremely rare in the terahertz frequency range [12][13][14][15][16]. After Tao et al designed the first THz absorber based on metamaterials in 2008 [17], metamaterial-based absorbers have attracted extensive research and attention [18][19][20][21][22]. In 2014, Wang et al designed a bandwidth absorber in the THz band through alloy metamaterials.…”

Tunable broadband absorber based on a layered resonant structure with a Dirac semimetal

“…It is called 3D graphene because it can realize a dynamic change of Fermi energy after surface alkaline doping to tune the electrical characteristics. [23][24][25][26][27][28] In 2018, a bulk Dirac semimetal (BDS) based tunable narrowband absorber at terahertz frequencies was proposed by Liu et al, 29 and then the absorber based on Dirac semimetal began to be used. [30][31][32][33] Generally speaking, the structure of the perfect absorber is based on metal-dielectric material-metal.…”