FDTD method study on the effects of geometric parameters on the W- Al2O3 nano-structure thermal emitter. (1st December 2020)

• Record Type: Journal Article
• Authors: Lyu, Jizu; Cui, Guicheng; Shi, Lin; Gao, Linsong; Bai, Minli; Jiang, Lei
• Is Part Of: Nanotechnology. Volume 32:Number 8(2021)
• Publication Date: 2020-12-01
• Subjects: wavelength-selective -- thermal emitters -- magnetic polaritons; Nanotechnology -- Periodicals; Nanotechnology -- Periodicals; Nanotechnology; Publications périodiques; Nanotechnologies; Periodicals; 620.5
• DOI: 10.1088/1361-6528/abc84f
• Languages: English
• ISSNs: 0957-4484

Abstract

Abstract: In this paper, a 2D periodic structure made of tungsten (W) grating patch on a thin Al2 O3 spacer and an opaque W film is proposed, as a broadband selective thermal emitter. We numerically investigated the spectral emissivity of the structure from the deep by finite-difference time-domain method. Geometric parameters effects on the emissivity are discussed and the mechanisms of magnetic polaritons in the structure are further analyzed in detail. In addition, by adding another metal-dielectric stack upon the pre-existing grating structure, the emissivity of the composite structure can be further enhanced, and the normal emissivity exceeds 0.95 in the wavelength range of 0.65–1.95 μ m, some even close to unity. Furthermore, the composite structures are found to exhibit insensitivity to polar angle and polarization.