Fig. 1. Three views of crystal structure. (a) Top view; (b) left view; (c) front view

Fig. 2. Reflectivity spectra of three Si slabs with and without photonic crystal

Fig. 3. Reflectivity spectrum of photonic crystal without mirror at different temperatures

Fig. 4. Reflectivity spectrum of photonic crystal with mirror at different temperatures (s=190 μm)

Fig. 5. Temperature-reflectivity curves at five frequencies

Fig. 6. Temperature-reflectivity curves at different incident angles

Fig. 7. Trends of temperature-reflectivity curves