OICC Press Journal of Theoretical and Applied Physics 2251-7235 6 1 2023 11 17 Nanoscale effects on multichannel add/drop filter based on 2-D photonic crystal ring-resonator heterostructure 10.1186/2251-7235-6-12 EN Hamed Pezeshki Department. of Electrical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran Vahid Ahmadi Department of Electrical and Computer Engineering, Tarbiat Modares University, Tehran, Iran Journal Article 2023 11 17 AbstractIn this paper, we propose a heterostructure multichannel add/drop filter based on 2-D photonic crystal ring-resonator in which, add and drop operations are accomplished by coupling between two W1 waveguides. The wavelength spacing of 10.3 nm, as well as the average cross-talk of −37.5 dB, are the other features of the proposed filter. Furthermore, nanoscale effects on the filter's performance including wavelength spacing, cross-talk amount, and dynamic response are considered. By taking into account these effects, the minimum wavelength spacing of 12 nm is obtained, whereas the filter’s cross-talk has an average of −40 dB. Simulations are performed using 2-D finite-difference time-domain calculations.