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.
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