Ruoxing Wang, Li Li, Tong Guo, Tianzhi Wang, Jianlong Liu, Hao Tian, Fengjun Tian, and Weimin Sun
https://www.osapublishing.org/ao/abstract.cfm?uri=ao-58-34-9406
We present, by simulations, a metastructured graphene/liquid crystal hybrid tuning terahertz perfect absorber that consists of graphene disk resonator arrays above a metallic layer separated with liquid crystal substrate. The liquid crystal refractive index and the graphene Fermi level are utilized to implement double-tuning operation to push the spectra scanning limit of the terahertz absorber. Our simulations demonstrate high performance of a near-linear broad tuning region and near-unity absorbance with wide incident angle and polarization independence. The range of the resonant frequency scan is notably enlarged at a spectral ratio of as high as while ensuring absorbance beyond 90%. Such graphene/liquid crystal hybrid tuning scheme would be preferable to push the working-band limit of terahertz perfect absorbers.
© 2019 Optical Society of America
No comments:
Post a Comment