A hybrid approach towards on-chip visible lasers
Name
1191625254-MIT.pdf
Size
62.66 MB
Format
Adobe PDF
Checksum (MD5)
4e1606a535ab77c97b0d09699d475ac4
Author(s)
Mahony, Thomas Stephen.
Advisor(s)
Vladimir Bulović.
Date Issued
2020
Publisher
Massachusetts Institute of Technology
Abstract
In recent years, the world of nanostructured optically active materials has expanded to include organic molecules; colloidal nanocrystals such as quantum dots, quantum rods, and quantum wells or nanoplatelets; perovskite semiconductors; and perovskite nanocrystals. A key feature of these materials is the capability to engineer their energy levels, e.g., via chemical composition or size, allowing for their absorption and emission spectra to be tuned throughout the visible and near-infrared electromagnetic spectrum. Many of these materials are deposited from solution, which makes them suitable for large-area technologies such as solar cells and light-emitting devices (LEDs) for displays. However, nanopatterning these materials and integrating them into photonic devices has proven dicult due to fabrication constraints. In this work, we demonstrate strategies for processing and nanopatterning organic molecules, colloidal quantum dots, and cadmium selenide nanoplatelets. We created nanobeam photonic crystal cavities that incorporate organic gain media resulting in an ultracompact low-threshold organic laser. We combined colloidal quantum dots with polymethylmethacrylate (PMMA) to create suspended polymeric cavities that showed enhanced spontaneous emission from the quantum dots. By functionalizing surfaces, we achieved orientation control of nanoplatelet αlms. We also achieved the αrst demonstration of lithographically patterned nanoplatelet αlms, and we integrated them into silicon nitride photonics. We developed these processing and nanopatterning strategies while building architectures for on-chip lasers; nevertheless, these techniques have broad applicability to other technologies.
Description
Thesis: Ph. D., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, May, 2020
Cataloged from the official PDF of thesis.
Includes bibliographical references (pages 181-195).
Subjects
Electrical Engineering and Computer Science.
MIT Department
Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science
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MIT theses may be protected by copyright. Please reuse MIT thesis content according to the MIT Libraries Permissions Policy, which is available through the URL provided.
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