Electric Field Transmittance in a 1D Alternating Photonic Crystal
This Demonstration calculates the electric field transmission from a 1D photonic crystal that consists of alternating layers having refractive indices of and You can see the band gap phenomena. The dependence of the band gap width and transmission on the difference in and is evident.
Formulas and constants used:
speed of light:
width of the high refractive index layer:
width of the low refractive index layer:
period of the high and low layers:
incoming wavelength/frequency: ;
Bragg frequency: ;
 A. Yariv and P. Yeh, Optical Waves in Crystals: Propagation and Control of Laser Radiation, New York: Wiley, 1984.