Transmission performance of 1D quaternary photonic crystal with multiple defects

In this note, we show the transmission performance of 1D quaternary photonic crystal (QPC) with two defect layers in the structure. The structure consists of 6 periods of four materials followed by a first defect layer (air column) in sequence with 12 periods of same four materials followed by a second defect layer (air column) then again 6 periods of four materials. This note is written to extend our recently published work (Singh et al. in J Opt, 2023. 10.1007/s12596-022-01085-7) on 1D QPCs. These multiple defect 1D QPCs are innovative structural options for making photonic devices.