Ultra-compact broadband mode converter and optical diode based on linear rod-type photonic crystal waveguide | Zendy

Han Ye | Zendy; Donglin Wang | Zendy; Zhongyuan Yu | Zendy; Jinqiannan Zhang | Zendy; Zhihui Chen | Zendy

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Ultra-compact broadband mode converter and optical diode based on linear rod-type photonic crystal waveguide

Author(s) -

Han Ye,

Donglin Wang,

Zhongyuan Yu,

Jinqiannan Zhang,

Zhihui Chen

Publication year - 2015

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.23.009673

Subject(s) - optics , broadband , photonic crystal , diode , photonic integrated circuit , bandwidth (computing) , waveguide , photonics , materials science , optoelectronics , physics , computer science , telecommunications

In this paper, we present extremely compact designs of both broadband mode converter and optical diode in linear rod-type photonic crystal (PhC) waveguide with functional region consisting of only 4 × 1 unit cells of perfect PhC. The dielectric distribution inside functional region are optimized by combining geometry projection method and method of moving asymptotes. Bidirectional mode converter realizes above 60% transmission efficiency within bandwidth 0.02c/a, where c and a represent light velocity and PhC lattice constant respectively. Optical diode achieves above 19 dB unidirectionality for even mode within bandwidth 0.01c/a. Moreover, the proposed designs have reasonable tolerance of rod boundary fluctuation. We expect the results will help developing recipes for future PhC devices in all-optical integrated circuits.

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