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Proceedings Paper

Light trapping in photonic crystals
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Paper Abstract

We consider light trapping in photonic crystals. Using temporal coupled-mode theory and assuming that the active material is weakly absorbing, we show that the upper bound of the angle-integrated light trapping absorption enhancement is proportional to the photonic density of states. The tight bound can be reached if all the modes supported by the structure are coupled to external radiation. We discuss the roles of van Hove singularity, effective medium theory, and periodicity. By appropriate design, the angle-integrated absorption enhancement could surpass the conventional limit substantially in two dimension and marginally in three dimension.

Paper Details

Date Published: 7 October 2014
PDF: 9 pages
Proc. SPIE 9177, Thin Films for Solar and Energy Technology VI, 91770N (7 October 2014); doi: 10.1117/12.2061160
Show Author Affiliations
Ken X. Wang, Stanford Univ. (United States)
Zongfu Yu, Stanford Univ. (United States)
Victor Liu, Stanford Univ. (United States)
Aaswath Raman, Stanford Univ. (United States)
Yi Cui, Stanford Univ. (United States)
Shanhui Fan, Stanford Univ. (United States)


Published in SPIE Proceedings Vol. 9177:
Thin Films for Solar and Energy Technology VI
Louay A. Eldada; Michael J. Heben, Editor(s)

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