title: Achieving ultranarrow graphene perfect absorbers by exciting guided-mode resonance of one-dimensional photonic crystals.
abstract: Graphene perfect absorbers with ultranarrow bandwidth are numerically proposed by employing a subwavelength dielectric grating to excite the guided-mode resonance of one-dimensional photonic crystals (1DPCs). Critical coupling of the guided-mode resonance of 1DPCs to graphene can produce perfect absorption with a ultranarrow bandwidth of 0.03 nm. The quality factor of the absorption peak reaches a ultrahigh value of 20000. It is also found that the resonant absorption peaks can be tuned by controlling the dispersion line of the guided mode and the period of the grating. When the parameters of the grating and the 1DPCs are suitably set, the perfect absorption peaks can be tuned to any randomly chosen wavelength in the visible wavelength range.
authors: College of Electronic Engineering, South China Agricultural University, Guangzhou, 510642, China.
authors: Yongbing
authors: Y
authors: Long
authors: State Key Laboratory on Integrated Optoelectronics, College of Electronic Science and Engineering, Jilin University, 2699 Qianjin Street, Changchun 130012, China.
authors: Liang
authors: L
authors: Shen
authors: College of Electronic Engineering, South China Agricultural University, Guangzhou, 510642, China.
authors: Haitao
authors: H
authors: Xu
authors: College of Electronic Engineering, South China Agricultural University, Guangzhou, 510642, China.
authors: Haidong
authors: H
authors: Deng
authors: School of Applied Physics and Material, WuYi University, Jiangmen, 529020, China.
authors: Yuanxing
authors: Y
authors: Li