Band gap control of colloidal photonic crystal by hyperthermal neutral beam etching

Young-Sang Cho; Gi-Ra Yi; Jun Hyuk Moon; Bong-Ju Lee; Seung-Man Yang; Chul-Jin Choi

doi:10.1117/12.861115

10 September 2010 Band gap control of colloidal photonic crystal by hyperthermal neutral beam etching

Young-Sang Cho, Gi-Ra Yi, Jun Hyuk Moon, Bong-Ju Lee, Seung-Man Yang, Chul-Jin Choi

Proceedings Volume 7755, Nanophotonic Materials VII; 775509 (2010) https://doi.org/10.1117/12.861115
Event: SPIE NanoScience + Engineering, 2010, San Diego, California, United States

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.

Citation Download Citation

Young-Sang Cho, Gi-Ra Yi, Jun Hyuk Moon, Bong-Ju Lee, Seung-Man Yang, and Chul-Jin Choi "Band gap control of colloidal photonic crystal by hyperthermal neutral beam etching", Proc. SPIE 7755, Nanophotonic Materials VII, 775509 (10 September 2010); https://doi.org/10.1117/12.861115

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