Modeling Compact Non-Volatile Photonic Switching Based on Optical Phase Change Material and Graphene Heater
Name
dao-khoidao-sm-dmse-2024-thesis.pdf
Description
Thesis PDF
Size
1.12 MB
Format
Adobe PDF
Checksum (MD5)
6b3919e2a618cdd2880bbda2188df2d3
Author(s)
Dao, Khoi Phuong
Advisor(s)
Hu, Juejun
Date Issued
February 2024
Publisher
Massachusetts Institute of Technology
Abstract
On-chip photonic switches are the building blocks for programable integrated circuits (PICs) and the integration of phase change materials (PCMs) enables promising designs which are compact, non-volatile, and efficient. However, conventional PCMs such as Ge₂Sb₂Te₅ (GST) introduce significant optical absorption loss, leading to elevated insertion losses in devices. Current approaches, compensating for this loss through weak evanescent light-PCM interactions, result in larger footprint devices. A compact non-volatile 2 × 2 switch design is introduced, leveraging optical concentration in slot waveguide modes to significantly enhance interactions of light with PCM, thereby realizing a compact, efficient photonic switch. The crystalline-amorphous phase transitions are driven by an integrated single-layer graphene heater, providing high electro-thermal efficiency, low absorption loss, and rapid switching speed. Computational simulations demonstrate reversible phase transitions of Sb₂Se₃ facilitating 2 working states with crosstalk (CT) down to -24 dB at 1550 nm wavelength and more than 55 nm 0.3 dB insertion loss (IL)bandwidth. The proposed photonic switch architecture can constitute the cornerstone for next-generation high-performance reconfigurable photonic circuits.
MIT Department
Massachusetts Institute of Technology. Department of Materials Science and Engineering
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