Multilayer tungsten-alumina-based broadband light absorbers for high-temperature applications

作者：Chirumamilla Manohar^*; Roberts Alexander S; Ding Fei; Wang Deyong; Kristensen Peter Kjaer; Bozhevolnyi Sergey I; Pedersen Kjeld

来源：Optical Materials Express, 2016, 6(8): 2704-2714.

DOI：10.1364/OME.6.002704

Efficient broadband absorption of visible and near-infrared light by low quality-factor metal-insulator-metal (MIM) resonators using refractory materials is reported. Omnidirectional absorption of incident light for broad angles of incidence and polarization insensitivity are observed for the fabricated MIM resonator. Excellent thermal stability of the absorber is demonstrated at high operating temperatures (800 degrees C). The experimental broadband absorption spectra show good agreement with simulations. The resonator with 12 nm top tungsten and 100 nm alumina spacer film shows absorbance above 95% in the range of 650 to 1750 nm. The absorption window is tunable in terms of the center wavelength, bandwidth, and the value of maximum absorbance (similar to 98%) by simple variation of appropriate layer thicknesses. Owing to their flexibility, ease of fabrication and low cost, the presented absorbers have the potential for a wide range of applications, including the use in commonly used infrared bands or absorbers for (solar) thermo-photovoltaic energy conversion, where high absorbance and simultaneously low (thermal) re-radiation is of paramount importance.

• 出版日期2016-8-1