Modelling of three tunable multichannel filters using Ag metal as a defect layer in a photonic crystal

Abstract

"Three optical multi-color flters are modelled in the current work. They are composed of defective photonic crystals of two layers A and B and a defect layer C which is selected as silver Ag. The three multi-color flters have the structures (ABA)(ABAC)N(ABA),

(ABAC)NABA, and (ABAC)N(BAB). The transmission spectra of the flters are investigated for diferent values of coupled defects (N). It is found that the three flters have several fltering channels. These channels are directly related to the number of coupled defects.

In the multi-color flters (ABA)(ABAC)N(ABA), (ABAC)NABA, and (ABAC)N(BAB), the number of fltering channels is equal to N+1, N and N−1, respectively. With the increase

of N, the resonant peaks are blue shifted. These flters can be used efectively in preamplifcation, radio tuning to a specifc frequency, tone control in audio systems, equalization and signal processing circuits."