Yuefei Chen, Wenrui Xue, Chen Zhao, Chen Zhang, Changyong Li. Grating-Type Mid-Infrared Absorber Based on Hexagonal Boron Nitride Material[J]. Acta Optica Sinica, 2019, 39(10): 1005001
- Acta Optica Sinica
- Vol. 39, Issue 10, 1005001 (2019)
Fig. 1. Structural schematic of grating-type absorber
Fig. 2. Relationship between dielectric constant of h-BN and wavelength. (a) Relationship between real part of dielectric constant of h-BN and wavelength; (b) relationship between imaginary part of dielectric constant of h-BN and wavelength
Fig. 3. Contour map of absorption versus incident angle and wavelength under optimized structural parameters
Fig. 4. Magnetic field distributions of unit structure at different incident wavelengths under normal incidence of TM. (a) 6.5 μm; (b) 10.5 μm; (c) 12.5 μm; (d) 13.8 μm
Fig. 5. Relative changes of absorption curves when geometrical parameters of the structure are changed and other parameters remain unchanged. (a) L ; (b) P ; (c) T 1; (d) T 2; (e) W 1; (f) W 2
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Table 1. Parameters in the expression of dielectric constant of h-BN material
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