Transmission character of general function photonic crystals

► The peak value of transmission intensity T can be much larger or smaller than 1. ► When T>1, the optical thickness increases, the number of band gaps increases, and the width becomes narrow. ► When T<1, the optical thickness increases, the number of band gaps increases, and the width becomes narrow. ► When T>1, as the incident angles increase, the transmissivity increases, and the band gaps red shift. ► We study the effect of incident angles and periods number on the transmissivity.