Broadband light-trapping enhancement in an ultrathin film a-si absorber using whispering gallery modes and guided wave modes with dielectric surface-textured structures

Gumin Kang; Haesung Park; Dongheok Shin; Seunghwa Baek; Minjung Choi; Dai Hyuk Yu; Kyoungsik Kim; Willie J. Padilla

doi:10.1002/adma.201204596

Broadband light-trapping enhancement in an ultrathin film a-si absorber using whispering gallery modes and guided wave modes with dielectric surface-textured structures

Gumin Kang, Haesung Park, Dongheok Shin, Seunghwa Baek, Minjung Choi, Dai Hyuk Yu, Kyoungsik Kim, Willie J. Padilla

Research output: Contribution to journal › Article › peer-review

62 Scopus citations

Abstract

An embedded nanosphere dielectric structure on an a-Si ultrathin film improves weighted absorption from 23.8% to 39.9%. The PMMA embedding layer offers a guided wave mode as well as mechanical robustness, in addition to the resonant whispering gallery modes coupling. Broadband light-trapping enhancements are observed by dielectric surface textured structures of hemispheres, nanocones, nanospheres, or embedded nanospheres.

Original language	English (US)
Pages (from-to)	2617-2623
Number of pages	7
Journal	Advanced Materials
Volume	25
Issue number	18
DOIs	https://doi.org/10.1002/adma.201204596
State	Published - May 14 2013
Externally published	Yes

Keywords

metamaterials
nanostructures
photonic crystals
self-assembly
whispering gallery modes

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title = "Broadband light-trapping enhancement in an ultrathin film a-si absorber using whispering gallery modes and guided wave modes with dielectric surface-textured structures",

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AU - Shin, Dongheok

AU - Baek, Seunghwa

AU - Choi, Minjung

AU - Yu, Dai Hyuk

AU - Kim, Kyoungsik

AU - Padilla, Willie J.

PY - 2013/5/14

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AB - An embedded nanosphere dielectric structure on an a-Si ultrathin film improves weighted absorption from 23.8% to 39.9%. The PMMA embedding layer offers a guided wave mode as well as mechanical robustness, in addition to the resonant whispering gallery modes coupling. Broadband light-trapping enhancements are observed by dielectric surface textured structures of hemispheres, nanocones, nanospheres, or embedded nanospheres.

KW - metamaterials

KW - nanostructures

KW - photonic crystals

KW - self-assembly

KW - whispering gallery modes

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Broadband light-trapping enhancement in an ultrathin film a-si absorber using whispering gallery modes and guided wave modes with dielectric surface-textured structures

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Keywords

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