2026-09-20T07:21:08Zhttps://dspace.mit.edu/server/oai/request

oai:dspace.mit.edu:1721.1/1536932024-03-14T03:10:16Zcom_1721.1_7582com_1721.1_7581col_1721.1_131023

Hu, Juejun Dao, Khoi Phuong Massachusetts Institute of Technology. Department of Materials Science and Engineering 2024-03-13T13:27:12Z 2024-03-13T13:27:12Z 2024-02 2024-01-19T19:43:18.919Z https://hdl.handle.net/1721.1/153693 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. S.M. Massachusetts Institute of Technology In Copyright - Educational Use Permitted Copyright retained by author(s) https://rightsstatements.org/page/InC-EDU/1.0/ Modeling Compact Non-Volatile Photonic Switching Based on Optical Phase Change Material and Graphene Heater Thesis application/pdf Master Master of Science in Materials Science and Engineering Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="d17bb325-2efa-4b8e-ace0-336c75223399"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Title>Modeling Compact Non-Volatile Photonic Switching Based on Optical Phase Change Material and Graphene Heater</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2024-02</PublicationDate> <Authors> <Author> <DisplayName>Dao, Khoi Phuong</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>https://rightsstatements.org/page/InC-EDU/1.0/</License> <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.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>