Insciences J. 2014, 4(1), 19-26;doi:10.5640/insc.040119

Full Research Paper, Section: Nanotechnology

Polarization and incident angle insensitive germanium nano-pyramid array for perfect absorption in visible regime

Qi Han¹, Lei Jin¹, Yongqi Fu^{1 *} , Weixing Yu^{2 *}

¹ School of Physical Electronics, University of Electronic Science and Technology of China, Chengdu 610054, P.R. China
² State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun, Jilin, 130033, P.R. China

^* Author to whom correspondence should be addressed.

Published: March 19, 2014

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Abstract

An extraordinary light harvesting property of a periodic nano-pyramid array is reported. It is found that the nano-pyramid array can absorb light efficiently with an average absorptivity of 0.998 over the whole visible waveband. The ultra-high absorption is independent of the incoming light on polarization state and insensitive within a broad angle range. We attribute the efficient light harvesting property of the nano-pyramid array to Fabry-Perot resonance physically. This perfect absorber has advantages of easy fabrication, cost effective, and stable energy harvesting.

absorption, broadband, nano-pyramid array, visible regime