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Vladimir Bulović. Mahony, Thomas Stephen. Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science. Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science 2020-09-03T17:42:32Z 2020-09-03T17:42:32Z 2020 2020 https://hdl.handle.net/1721.1/127023 1191625254 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). 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. by Thomas Stephen Mahony. Ph.D. Ph.D. Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science 195 pages eng Massachusetts Institute of Technology 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. http://dspace.mit.edu/handle/1721.1/7582 Electrical Engineering and Computer Science. A hybrid approach towards on-chip visible lasers Thesis application/pdf 2020-09-03T17:42:30Z Publication Doctoral EECS unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="8fc06ee3-acc0-4fff-8a71-9914e56e1216"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>A hybrid approach towards on-chip visible lasers</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2020</PublicationDate> <Authors> <Author> <DisplayName>Mahony, Thomas Stephen.</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Electrical Engineering and Computer Science.</Keyword> <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.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>