High efficient light absorption and nanostructure-dependent birefringence of a metal-dielectric symmetrical layered structure

Yi-Jun Jen; Yi-Ciang Jhang; Wei-Chih Liu

doi:10.1117/12.2273927

30 August 2017 High efficient light absorption and nanostructure-dependent birefringence of a metal-dielectric symmetrical layered structure

Yi-Jun Jen, Yi-Ciang Jhang, Wei-Chih Liu

Author Affiliations +

Proceedings Volume 10356, Nanostructured Thin Films X; 1035604 (2017) https://doi.org/10.1117/12.2273927
Event: SPIE Nanoscience + Engineering, 2017, San Diego, California, United States

Abstract

A multilayer that comprises ultra-thin metal and dielectric films has been investigated and applied as a layered metamaterial. By arranging metal and dielectric films alternatively and symmetrically, the equivalent admittance and refractive index can be tailored separately. The tailored admittance and refractive index enable us to design optical filters with more flexibility. The admittance matching is achieved via the admittance tracing in the normalized admittance diagram. In this work, an ultra-thin light absorber is designed as a multilayer composed of one or several cells. Each cell is a seven-layered film stack here. The design concept is to have the extinction as large as possible under the condition of admittance matching. For a seven-layered symmetrical film stack arranged as Ta₂O₅ (45 nm)/ a-Si (17 nm)/ Cr (30 nm)/ Al (30 nm)/ Cr (30 nm)/ a-Si (17 nm)/ Ta₂O₅ (45 nm), its mean equivalent admittance and extinction coefficient over the visible regime is 1.4+0.2i and 2.15, respectively. The unit cell on a transparent BK7 glass substrate absorbs 99% of normally incident light energy for the incident medium is glass. On the other hand, a transmission-induced metal-dielectric film stack is investigated by using the admittance matching method. The equivalent anisotropic property of the metal-dielectric multilayer varied with wavelength and nanostructure are investigated here.

Conference Presentation

Citation Download Citation

Yi-Jun Jen, Yi-Ciang Jhang, and Wei-Chih Liu "High efficient light absorption and nanostructure-dependent birefringence of a metal-dielectric symmetrical layered structure", Proc. SPIE 10356, Nanostructured Thin Films X, 1035604 (30 August 2017); https://doi.org/10.1117/12.2273927

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