Jinhua Hu, Jia Fu, Xiuhong Liu, Danping Ren, Jijun Zhao, Yongqing Huang. Perfect absorption in a monolayer graphene at the near-infrared using a compound waveguide grating by robust critical coupling[J]. Chinese Optics Letters, 2019, 17(1): 010501
- Chinese Optics Letters
- Vol. 17, Issue 1, 010501 (2019)
Fig. 1. Schematic of the graphene-based absorber. (a) Monolayer graphene covered on the top of the CWG with a DBR mirror. (b) Cross-section of the absorber for TE-polarized light at normal incidence.
Fig. 2. RCWA simulation result and theoretically calculated result of the absorption spectrum for TE polarization light at normal incidence.
Fig. 3. Electric field amplitude distributions of the graphene-based absorber for TE polarization under normal incidence at the (a) on-resonant wavelength of 1550.8 nm and (b) off-resonant wavelength of 1540 nm.
Fig. 4. Absorption spectra in the structure as a function of wavelength and gap G P = 710 nm W 1 = 200 nm W 2 = 150 nm t g = 220 nm t b = 270 nm
Fig. 5. Absorption spectra of the structure as a function of wavelength for different grating thickness t g t b P = 710 nm W 1 = 200 nm W 2 = 150 nm G = 25 nm t b = 270 nm t g = 220 nm
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Table 1. Eigenvalues of TE Eigenmodes Corresponding to Different Gap G
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