Please use this identifier to cite or link to this item: https://doi.org/10.1364/OL.43.005504
Title: Dispersion engineering and thermo-optic tuning in mid-infrared photonic crystal slow light waveguides on silicon-on-insulator
Authors: Ma, Yiming 
Dong, Bowei 
Li, Bo 
Ang, Kah-Wee 
Lee, Chengkuo 
Keywords: Science & Technology
Physical Sciences
Optics
PLATFORMS
GERMANIUM
CHIP
Issue Date: 15-Nov-2018
Publisher: OPTICAL SOC AMER
Citation: Ma, Yiming, Dong, Bowei, Li, Bo, Ang, Kah-Wee, Lee, Chengkuo (2018-11-15). Dispersion engineering and thermo-optic tuning in mid-infrared photonic crystal slow light waveguides on silicon-on-insulator. OPTICS LETTERS 43 (22) : 5504-5507. ScholarBank@NUS Repository. https://doi.org/10.1364/OL.43.005504
Abstract: © 2018 Optical Society of America In this Letter, the design, fabrication, and characterization of slow light devices using photonic crystal waveguides (PhCWs) in the mid-infrared wavelength range of 3.9–3.98 μm are demonstrated. The PhCWs are built on the silicon-on-insulator platform without undercut to leverage its well-developed fabrication process and strong mechanical robustness. Lattice shifting and thermo-optic tuning methods are utilized to manipulate the slow light region for potential spectroscopy sensing applications. Up to 20 nm wavelength shift of the slow light band edge is demonstrated. Normalized delay-bandwidth products of 0.084–0.112 are obtained as a result of dispersion engineering. From the thermo-optic characterization results, the slow light enhancement effect of thermo-optic tuning efficiency is verified by the proportional relationship between the phase shift and the group index. This work serves as a proof of concept that the slow light effect can strengthen light–matter interaction and thereby improve device performance in sensing and nonlinearity applications.
Source Title: OPTICS LETTERS
URI: https://scholarbank.nus.edu.sg/handle/10635/168951
ISSN: 0146-9592
1539-4794
DOI: 10.1364/OL.43.005504
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