Design and Analysis of High Absorber Based on Sub-Wavelength Grating Structure

Abstract:

Two kinds of high absorber were designed based on sub-wavelength grating structure for aluminum substrate. The absorption and electric field distribution of these two structures were calculated by using the finite difference time domain method. One absorber was obtained by using Al₂O₃/SiO₂ double layers and Al rectangular sub-wavelength layer which has high absorption peaks both in TE polarization and TM polarization in infrared spectrum. Another absorber was a single layer structure with a triangular sub-wavelength grating structure which had a broadband absorption in TE polarization at spectral range of 300-1000nm.Simulation results showed that the absorption of this absorber increase and then decreases with the increasing of the height of sub-wavelength grating. The average absorption reached the maximum when the height of grating was 800nm.

• Periodical: Applied Mechanics and Materials (Volume 872)
• Pages: 89-93
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.872.89
• Online since: October 2017
• Authors: Kun Li, Yu Qing Xiong*, Sheng Zhu Cao, Kai Feng Zhang, Hu Wang, Chao Zhou
• Keywords: Grating, High Absorber, Sub-Wavelength

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