https://doi.org/10.1140/epjd/s10053-023-00670-0
Regular Article – Optical Phenomena and Photonics
Super-dispersive demultiplexer design using positive–negative refraction boundary and hetero-photonic crystals
Electrical and Computer Engineering Faculty, Tarbiat Modares University, Tehran, Iran
Received:
5
December
2022
Accepted:
12
May
2023
Published online:
12
June
2023
In this paper, a systematic approach is employed to design a photonic crystal with a boundary between positive and negative refraction to boost the refractive properties of the crystal. Mathematical techniques are employed to turn the process of equi-frequency contours’ engineering into a nearly mechanical process free of trial-and-error steps. The designed demultiplexer’s operational characteristics are then further improved by adding a second photonic crystal with an oblique boundary. The refracted beams in the first crystal impinge on an oblique interface of the second photonic crystal to experience a change in Bloch wavenumbers and even greater refraction angles so that a novel super-dispersive two-step optical demultiplexer is made. A beam divergence of 161 degrees is obtained for an input spectrum of λ = [1474 nm, 1550 nm] which is quite superior than the design’s counterparts.
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