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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
Author(s) -
Kang Gumin,
Park Haesung,
Shin Dongheok,
Baek Seunghwa,
Choi Minjung,
Yu DaiHyuk,
Kim Kyoungsik,
Padilla Willie J.
Publication year - 2013
Publication title -
advanced materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 10.707
H-Index - 527
eISSN - 1521-4095
pISSN - 0935-9648
DOI - 10.1002/adma.201204596
Subject(s) - materials science , whispering gallery wave , dielectric , broadband , optoelectronics , trapping , optics , absorption (acoustics) , composite material , resonator , ecology , physics , biology
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.