OPTICAL DEVICE

摘要

A photonic crystal (2) which comprises a material in a gel form and, arranged in the material, a plurality of micro-spheres of silica or barium titanate or micro pores. The application of an external force transforms the photonic crystal (2), which in turn changes the photonic band gap thereof. The change of the photonic band results in the restriction of the transmission of a light having a specific wave length through the photonic crystal, which allows the output of a light of a desired wave length from the photonic crystal (2). The photonic crystal can easily change the wavelength of a light outputted therefrom by the change of an external force applied thereto.