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Proceedings Paper

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

Paper Details

Date Published: 25 April 2012
PDF: 9 pages
Proc. SPIE 8425, Photonic Crystal Materials and Devices X, 84250Q (25 April 2012); doi: 10.1117/12.922427
Show Author Affiliations
Romain Peretti, Univ. de Lyon, Institut des Nanotechnologies de Lyon, CNRS-INSA-ECL-UCBL (France)
Guillaume Gomard, Univ. de Lyon, Institut des Nanotechnologies de Lyon, CNRS-INSA-ECL-UCBL (France)
Christian Seassal, Univ. de Lyon, Institut des Nanotechnologies de Lyon, CNRS-INSA-ECL-UCBL (France)
Xavier Letartre, Univ. de Lyon, Institut des Nanotechnologies de Lyon, CNRS-INSA-ECL-UCBL (France)
Emmanuel Drouard, Univ. de Lyon, Institut des Nanotechnologies de Lyon, CNRS-INSA-ECL-UCBL (France)


Published in SPIE Proceedings Vol. 8425:
Photonic Crystal Materials and Devices X
Hernán Ruy Míguez; Sergei G. Romanov; Lucio Claudio Andreani; Christian Seassal, Editor(s)

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