Modal approach for tailoring the absorption in a photonic crystal membrane
Abstract
In this paper, we propose a method for tailoring the absorption in a photonic crystal membrane. For that purpose, we first applied Time Domain Coupled Mode Theory to such a subwavelength membrane and demonstrated that 100% resonant absorption can be reached even for a symmetric membrane, if degenerate modes are involved. Design rules were then derived from this model in order to tune the absorption. Subsequently, Finite Difference Time Domain simulations were used as a proof of concept and carried out on a low absorbing material (extinction coefficient=10-2) with a high refractive index corresponding to the optical indices of amorphous silicon at around 720 nm. In doing so, 85% resonant absorption was obtained, which is significantly higher than the commonly reported 50% maximum value. Those results were finally analyzed and confronted to theory so as to extend our method to other materials, configurations and applications.
Keywords
Cite
@article{arxiv.1306.3832,
title = {Modal approach for tailoring the absorption in a photonic crystal membrane},
author = {Romain Peretti and Guillaume Gomard and Christian Seassal and Xavier Letartre and Emmanuel Drouard},
journal= {arXiv preprint arXiv:1306.3832},
year = {2013}
}