| 초록 |
Photonic crystals containing multiple rugate structure are prepared by electro-chemical etchings. A method of preparing one-dimensional photonic crystals with multiple peaks in their optical reflectivity spectrum is described. Etching is carried out in a Teflon cell by using a two-electrode configuration with a Pt mesh counter electrode. They exhibit sharp photonic band gaps in the optical reflectivity spectrum. This reflectivity can be tuned to appear anywhere in the visible to near-infrared spectral range, depending on the programmed etch waveform. The structure of rugate PSi was investigated by field emission scanning electron micrograph (FESEM). |
