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Proceedings Paper

Band gap control of colloidal photonic crystal by hyperthermal neutral beam etching
Author(s): Young-Sang Cho; Gi-Ra Yi; Jun Hyuk Moon; Bong-Ju Lee; Seung-Man Yang; Chul-Jin Choi
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Paper Abstract

The photonic band gap of colloidal crystal films made of polystyrene nanospheres was controlled by dry etching technology using hyperthermal neutral beam. Vertical deposition technique was applied to prepare colloidal crystal films with face centered cubic lattice structure using aqueous suspension of monodispersed polystyrene particles. The pseudogap of these colloidal photonic crystals was tuned by etching the films with neutral beam, which reduces the size of the constituent polystyrene particles. Isotropic reduction of the particles in collodial crystal films resulted in the blue shift of stop band of the photonic band gap materials. By changing the etching time, the reflected colors of the dry-etched colloidal crystals were successfully controlled.

Paper Details

Date Published: 10 September 2010
PDF: 7 pages
Proc. SPIE 7755, Nanophotonic Materials VII, 775509 (10 September 2010); doi: 10.1117/12.861115
Show Author Affiliations
Young-Sang Cho, Korea Institute of Materials Science (Korea, Republic of)
Gi-Ra Yi, Chungbuk National Univ. (Korea, Republic of)
Jun Hyuk Moon, Sogang Univ. (Korea, Republic of)
Bong-Ju Lee, National Fusion Research Institute (Korea, Republic of)
Seung-Man Yang, Korea Advanced Institute of Science and Technology (Korea, Republic of)
Chul-Jin Choi, Korea Institute of Materials Science (Korea, Republic of)

Published in SPIE Proceedings Vol. 7755:
Nanophotonic Materials VII
Stefano Cabrini; Taleb Mokari, Editor(s)

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