Deducing critical coupling condition to achieve perfect absorption for thin-film absorbers and identifying key characteristics of absorbing materials needed for perfect absorption
- 3 March 2014
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 104 (9), 091109
- https://doi.org/10.1063/1.4867646
Abstract
Equations are deduced to describe the critical coupling condition to achieve perfect absorption for the thin-film absorbers of absorbing layer/spacer layer/substrate. By numerically solving these equations, a linear inequality is obtained to describe key characteristics of the absorbing layer needed for perfect absorption at a given wavelength. Guided by this finding, various materials including metals and semiconductors are identified as the absorbing layer to achieve perfect absorption at a randomly chosen wavelength within the visible wavelength range of 400–800 nm. Finally, it is found that absorption in an ultrathin absorbing layer can approach 100% with the use of highly reflective substrate.Keywords
Funding Information
- NNSFC (11004154)
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