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.
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.
authors.affiliation: Address School of Mechanical Engineering, Yonsei University, Address 50 Yonsei-ro, Seodaemun-gu, Seoul 120-749, South Korea.
authors.forename: Gumin
authors.initials: G
authors.lastname: Kang
authors.forename: Haesung
authors.initials: H
authors.lastname: Park
authors.forename: Dongheok
authors.initials: D
authors.lastname: Shin
authors.forename: Seunghwa
authors.initials: S
authors.lastname: Baek
authors.forename: Minjung
authors.initials: M
authors.lastname: Choi
authors.forename: Dai-Hyuk
authors.initials: DH
authors.lastname: Yu
authors.forename: Kyoungsik
authors.initials: K
authors.lastname: Kim
authors.forename: Willie J
authors.initials: WJ
authors.lastname: Padilla