Lateral lattice shift engineered slow light in elliptical photonics crystal waveguides

Bo Li; Chong Pei Ho; Fu-Li Hsiao; Chengkuo Lee

doi:10.1117/1.JNP.8.084090

3 November 2014 Lateral lattice shift engineered slow light in elliptical photonics crystal waveguides

Bo Li, Chong Pei Ho, Fu-Li Hsiao, Chengkuo Lee

Author Affiliations +

Journal of Nanophotonics, Vol. 8, Issue 1, 084090 (November 2014). https://doi.org/10.1117/1.JNP.8.084090

Abstract

A photonics crystal (PhC) waveguide that operates in the slow-light regime is reported in this paper. A second line of circular air holes from the PhC waveguide in a triangular lattice is replaced by a line of elliptical air holes. Based on a three-dimensional plane wave expansion, the lateral shift of elliptical air holes is conducted to enhance the slow-light characteristics. A group index of 166 and a delay-bandwidth product of 0.1812 are derived from an optimized PhC using elliptical air holes with a lateral shift of 160 nm according to the simulation results. A Mach–Zehnder interferometer (MZI) is integrated with the above-mentioned PhC waveguide with a 17 μm length in one of its arms. The measured transmission spectrum of the fabricated MZI embedded with a PhC waveguide shows slow-light interference patterns.

CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.

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Bo Li, Chong Pei Ho, Fu-Li Hsiao, and Chengkuo Lee "Lateral lattice shift engineered slow light in elliptical photonics crystal waveguides," Journal of Nanophotonics 8(1), 084090 (3 November 2014). https://doi.org/10.1117/1.JNP.8.084090

Published: 3 November 2014

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Cited by 14 scholarly publications.

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KEYWORDS

Waveguides

Dispersion

Photonic crystals

Slow light

Silicon

Light wave propagation

Scanning electron microscopy

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