Enhancement of Photonic Crystal All-Optical Diode Efficiency with a Subwavelength Layer

Abstract

In this paper, the eect of a subwavelength thin layer on all-optical diode action in a one-dimensional photonic crystal is investigated. The photonic multilayer structure is considered as (BA) 6 (AB) 6 C(AABB) 6 , where layers A and B are nonlinear and linear materials respectively, and C is a thin layer with positive or negative-index material. The results are shown that by introducing a thin layer with dierent optical properties the all-optical diode eciency is controllable. In our numerical results, the transmission contrast of the structure, without the thin layer is obtained as 0.63, with a positive index material layer nearly zero and with a negative index material thin layer about 0.75.

Weyl semimetal assisted nonreciprocal modification of Flat-top optical pulses via defective photonic band-gap structures

“…Zhukovsky et al [11] have investigated light propagation in an asymmetric PC constructed from Kerr nonlinear materials with perfect transmission resonances. In reference [12], the effect of a sub-wavelength thin layer on all-optical diode action in an asymmetrical 1D PC is investigated. Yu MA et al in 2019 investigated the non-reciprocal properties of a 1D magnetized plasma PCs with the Fibonacci sequence [13].…”