Tailoring the absorption in a photonic crystal membrane: a modal approach

Romain Peretti; Guillaume Gomard; Christian Seassal; Xavier Letartre; Emmanuel Drouard

doi:10.1117/12.922427

25 April 2012 Tailoring the absorption in a photonic crystal membrane: a modal approach

Romain Peretti, Guillaume Gomard, Christian Seassal, Xavier Letartre, Emmanuel Drouard

Proceedings Volume 8425, Photonic Crystal Materials and Devices X; 84250Q (2012) https://doi.org/10.1117/12.922427
Event: SPIE Photonics Europe, 2012, Brussels, Belgium

Abstract

In order to achieve high efficiency photovoltaic devices and sensors, we propose to implement photonic crystals on thin absorbing layers in such a way to generate two Bloch mode resonances with opposite symmetries. Through FDTD and RCWA simulations, we track and adjust the characteristics of these modes so as to reach their degeneracy. Design and simulations were carried out considering a hydrogenated amorphous silicon layer. We demonstrate that up to 92% absorption can be achieved, far above the 50% limit corresponding to the critical coupling condition between an incident wave and an optical resonance. Moreover, the robustness of the absorption peak was tested by varying both the topographical parameters of the PhC membrane and the angle of incidence. Finally, some guidelines are provided to generalize our approach for the design of broadband absorbers.

Citation Download Citation

Romain Peretti, Guillaume Gomard, Christian Seassal, Xavier Letartre, and Emmanuel Drouard "Tailoring the absorption in a photonic crystal membrane: a modal approach", Proc. SPIE 8425, Photonic Crystal Materials and Devices X, 84250Q (25 April 2012); https://doi.org/10.1117/12.922427

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