Fig. 1. Omnidirectional mirror structure of cascade one-dimensional photonic crystals. (a) Original 3-level cascade structure; (b) transformed 3-level cascade structure

Fig. 2. Reflection characteristics of single-stage photonic crystals. (a) Reflector 1; (b) reflector 2; (c) reflector 3; (d) omnidirectional reflection band

Fig. 3. Reflectivity of a cascaded photonic crystal reflector as a function of wavelength and incident angle of TM polarized waves

Fig. 4. Omnidirectional reflection band of cascaded photonic crystal mirrors

Fig. 5. Reflectivity spectra of 3-level cascaded structures with different values of transformation coefficient a. (a) 1.0; (b) 0.8; (c) 0.5; (d) 0.1

Fig. 6. Distribution of electric field intensity on cutting surface of original photonic crystal. (a) 360 nm, 0°; (b) 480 nm, 0°; (c) 360 nm, 85°; (d) 480 nm, 85°