Nanostructures for coherent light sources and photodetectors
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Nanostructures for coherent light sources and photodetectors
Nanostructures forCoherent Light Sources and PhotodetectorsVinh Xuan HoDissertation submitted to the faculty of the Virginia Polytechnic Institute and Nanostructures for coherent light sources and photodetectors d State University in partial fulfillment of the requirements for the degree ofDoctor of PhilosophyinPhysicsVinh Ọ. Nguyen, Chair Giti A. Khodaparast Michael p. Cooney James R. MahanSatoru EmoriJames GrayApril 22,2020 Blacksburg, VirginiaKeywords: Lasing, GaN:Er, Graphene Photodetector, Mid-infrared Nanostructures for coherent light sources and photodetectors , Near-infraredCopyright © 2020 by Vinh Xuan HoNanostructures forCoherent Light Sources and PhotodetectorsVinh Xuan HoABSTRACTLarge-scale optoelectronNanostructures for coherent light sources and photodetectors
ic integration is limited by the lack of efficient light sources and broadband photodetectors, which could be integrated with the silicon complementarNanostructures forCoherent Light Sources and PhotodetectorsVinh Xuan HoDissertation submitted to the faculty of the Virginia Polytechnic Institute and Nanostructures for coherent light sources and photodetectors m silicon in extending the silicon technology into frilly integrated optoelectronic circuits. Recent breakthroughs, including the demonstration of highspeed optical modulators, photodetectors, and waveguides in silicon, have brought the concept of transition from electrical to optical interconnects Nanostructures for coherent light sources and photodetectors closer to realization. The on-chip light sources based on silicon are still a key challenge due to the indirect bandgap of silicon that impedes cohereNanostructures for coherent light sources and photodetectors
nt light sources. To overcome this issue, we have studied, fabricated, and characterized nanostructures including single semiconductor epilayers, multNanostructures forCoherent Light Sources and PhotodetectorsVinh Xuan HoDissertation submitted to the faculty of the Virginia Polytechnic Institute and Nanostructures for coherent light sources and photodetectors ht sources, we reported the demonstration of room-temperature lasing at the technologically crucial 1.5 pin wavelength range from Er-doped GaN epilayers and Er-doped GaN multiple-quantum wells grown on silicon and sapphire. The realization of roomtemperature lasing at the minimum loss window of opti Nanostructures for coherent light sources and photodetectors cal fiber and in the eye-safe wavelength region of 1.5 pm is highly sought-after for use in many applications in various fields including defense, indNanostructures for coherent light sources and photodetectors
ustrial processing, communication, medicine, spectroscopy and imaging. The resultslaid the foundation for achieving hybrid GaN-Si lasers providing a nNanostructures forCoherent Light Sources and PhotodetectorsVinh Xuan HoDissertation submitted to the faculty of the Virginia Polytechnic Institute and Nanostructures for coherent light sources and photodetectors However, silicon photodetectors arc sensitive in the uv to near infrared region. Photod elect ion in the mid-infrared is based on thermal radiation detectors, narrow bandgap materials (InGaAs, HgCdlc) semiconductors, photo-ionization of shallow impurities in semiconductors (Si:As. Ge:Ga). and quantu Nanostructures for coherent light sources and photodetectors m well structures. Such technology requhes complicated fabrication processes or cryogenic operation, resulting in manufacturing costs and severe integNanostructures for coherent light sources and photodetectors
ration issues. To develop broadband photodetectors, we focus on graphene photodetectors on silicon. Graphene generates photocarriers by absorbing photNanostructures forCoherent Light Sources and PhotodetectorsVinh Xuan HoDissertation submitted to the faculty of the Virginia Polytechnic Institute and Nanostructures for coherent light sources and photodetectors n material, especially in the infrared to terahertz region. Here, we have demonstrated high-performance hybrid photodetectors operating from the deep-ultraviolet to the mid-infrared region with high sensitivity and ultrafast response by coupling graphene with a p-type semiconductor photosensitizer, Nanostructures for coherent light sources and photodetectors nitrogen-doped TasOs thin film.https: //k hoth u Vi en.comNanostructures forCoherent Light Sources and PhotodetectorsVinh Xuan HoGENERAL AUDIENCE ABSTNanostructures for coherent light sources and photodetectors
RACTAccording to Moor’s law. the number of transistors per die area doubles every 18 months with no increase in power consumption, which means that diNanostructures forCoherent Light Sources and PhotodetectorsVinh Xuan HoDissertation submitted to the faculty of the Virginia Polytechnic Institute and Nanostructures for coherent light sources and photodetectors hotons (light) travel with the highest speed permitted by the known law of physics. The idea of optical interconnects, using photons instead of electrons, enables faster data transfer. Two important elements of the integrated circuits (ICs) based on photons are the coherent light source (laser) and Nanostructures for coherent light sources and photodetectors the photodetector. We investigated the optical properties of erbium doped gallium nitride epilayers and multiple quantum wells grown on silicon and saNanostructures for coherent light sources and photodetectors
pphire and demonstrated lasing from these materials at 1.5 pm. We also fabricated and characterized graphene photodetectors that can detect the light Nanostructures forCoherent Light Sources and PhotodetectorsVinh Xuan HoDissertation submitted to the faculty of the Virginia Polytechnic Institute and Nanostructures for coherent light sources and photodetectors . Besides, they are the heart of many important applications ranging from gas sensing, aerospace sensors and systems, thermal imaging, biomedical imaging, infrared spectroscopy, and lidar-to-optical telecommunications.To My Beloved FamilyVAcknowledgmentsThe journey I have taken in my Doctoral educat Nanostructures for coherent light sources and photodetectors ion has consummated in the completion of this dissertation. I have successfully reached this finishing line thanks to the invaluable and immense suppoNanostructures for coherent light sources and photodetectors
rt in numerous aspects of the following people who I am blessed to spend time with.First and foremost, I would like to express my profound gratitude tNanostructures forCoherent Light Sources and PhotodetectorsVinh Xuan HoDissertation submitted to the faculty of the Virginia Polytechnic Institute and Nanostructures for coherent light sources and photodetectors ectronics for me and shows me the effective research approach in this field. He is not only a wise and visionary advisor in academic research, but also a mentor in life who gave the foundation in his advice and the springboad in my favorable learning conditions to make a better me. His profound know Nanostructures for coherent light sources and photodetectors ledge, rich experience, rigorous attitude, and challenging spirit have been great values for me as a student, a researcher, and a teacher also. I trulNanostructures for coherent light sources and photodetectors
y felt the greatest honor to be supervised by Dr. Nguyen during my entire student life at Virginia Tech. Largely thanks to Dr. Vinh Nguyen, what I havNanostructures forCoherent Light Sources and PhotodetectorsVinh Xuan HoDissertation submitted to the faculty of the Virginia Polytechnic Institute and Nanostructures for coherent light sources and photodetectors embers. Dr. Giti A. Khodaparast, Dr. J. Robert Mahan, Dr. Michael p. Cooney, Dr. James Gray, Dr. Satoru Emori for all the constructive and helpfill suggestions I receive. My special thanks go to Dr. J. Robert Mahan for his guidance on the language and organization for my presentation. I also would l Nanostructures for coherent light sources and photodetectors ike to thank Dr. Camillo Mariani for his guidance through formatting my PhD dissertation.My very special thanks go to my colleagues Yifei Wang and YizNanostructures for coherent light sources and photodetectors
hou Wang. As a team, we have worked on several projects. I especially appreciate Yifei’s help during device fabrication with her carefill preparation Nanostructures forCoherent Light Sources and PhotodetectorsVinh Xuan HoDissertation submitted to the faculty of the Virginia Polytechnic Institute and Nanostructures for coherent light sources and photodetectors ng the redesign whenever I needed the correction. Furthermore. I would like to thank Victor Dao, Luke Patrick, Prashant Pradhan for designing experiment components. I could not have accomplished so much without the help of my lab mates. Besides. I really want to thank all my colleagues in my researc Nanostructures for coherent light sources and photodetectors h group: Abhishek Singh. Luan Doan. Jiarong Cui. Leslie Howe.Nanostructures forCoherent Light Sources and PhotodetectorsVinh Xuan HoDissertation submitted to the faculty of the Virginia Polytechnic Institute andNanostructures forCoherent Light Sources and PhotodetectorsVinh Xuan HoDissertation submitted to the faculty of the Virginia Polytechnic Institute andGọi ngay
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