Chiu NF, Yang CD, Kao YL, Lu KL. Enhancing extraction of light from metal composite structures for plasmonic emitters using light-coupling effect.
OPTICS EXPRESS 2015;
23:9602-9611. [PMID:
25968996 DOI:
10.1364/oe.23.009602]
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Abstract
This work demonstrates the efficiency and directionality of a method of extracting light from thin-film emissive devices by near-field evanescent waves in plasmonic emitters used in metal composite grating structures. A near-field evanescent wave can induce a surface plasmon wave on the surface of a metal under resonant conditions. Enhancing the near-field evanescent wave generates strong far-field nonlinear optical effects. This effect is highly efficient in some plasmonic emitter structures. Theoretical and experimental results demonstrate that such a metal composite grating structure exhibits good performance, a high coupling ratio, a small coupling angle, enhanced light extraction and a small FWHM. It also improves luminous efficiency, emitter angle, and directivity.
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