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Comparison of the phase change process in a GST-loaded silicon waveguide and MMI

Zhang, H., Yang, X., Lu, L., Chen, J., Rahman, B. M. ORCID: 0000-0001-6384-0961 and Zhou, L. (2021). Comparison of the phase change process in a GST-loaded silicon waveguide and MMI. Optics Express, 29(3), pp. 3503-3514. doi: 10.1364/OE.413660

Abstract

In the past decades, silicon photonic integrated circuits (PICs) have been considered a promising approach to solve the bandwidth bottleneck in optical communications and interconnections. Despite the rapid advances, large-scale PICs still face a series of technical challenges, such as large footprint, high power consumption, and lack of optical memory, resulting from the active tuning methods used to control the optical waves. These challenges can be partially addressed by combining chalcogenide phase change materials (PCMs) such as Ge2Sb2Te­5 (GST) with silicon photonics, especially applicable in reconfigurable optical circuit applications due to the nonvolatile nature of the GST. We systematically investigate the phase change process induced by optical and electrical pulses in GST-loaded silicon waveguide and multimode interferometer. Using optical pulse excitation to amorphize GST has a clear advantage in terms of operation speed and energy efficiency, while electrical pulse excitation is more suitable for large-scale integration because it does not require complex optical routing. This study helps us better understand the phase change process and push forward the further development of the Si-GST hybrid photonic integration platform, bringing in new potential applications.

Publication Type: Article
Additional Information: © 2021, Optical Society of America. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modifications of the content of this paper are prohibited." and link to final version.
Subjects: Q Science > QC Physics
T Technology > TK Electrical engineering. Electronics Nuclear engineering
Departments: School of Mathematics, Computer Science & Engineering > Engineering > Electrical & Electronic Engineering
Date available in CRO: 08 Jul 2021 07:51
Date deposited: 8 July 2021
Date of acceptance: 9 January 2021
Date of first online publication: 21 January 2021
URI: https://openaccess.city.ac.uk/id/eprint/26397
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