In the far-infrared (THz) field, single-walled carbon nanotubes (SWCNTs) are promising candidates for room-temperature and self-powered thermal detectors due to their low specific heat capacity, high stability, relatively large Seebeck coefficients, and the ability to be doped diversely. Especially when the nanotubes are aligned, the photoresponse becomes polarization-sensitive. In this work, we integrated a bowtie antenna stereostructure with a horizontally aligned SWCNTs film to generate new resonance modes and gain mechanisms to improve the polarization extinction ratio (PER) and the response of carbon nanotube far-infrared detectors. While the antenna size changes, we can get PERs higher than 6481 from 0.5THZ to 1.5 THz.
We numerically studied a simple and novel graphene-based dielectric microcavity narrowband perfect absorber. By electrically modulating the graphene Fermi level and critical coupling theory, our absorber achieves 100% perfect absorption at 8.0 μm in the mid-infrared, and the FWHM (full width at half-maximum) of the absorption peak is only 21 nm. We use the optical constants obtained from experimental data, including the mobility and surface conductivity of graphene, so the results are more applicable. In addition, the relatively simple structure of the dielectric microcavity graphene structure has a high tolerance for manufacturing defects.
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