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Hybrid Numerical Models for Fast Design of Terahertz Plasmonic Devices

Bhardwaj, Shubhendu
http://orcid.org/0000-0001-6174-5119
http://rave.ohiolink.edu/etdc/view?acc_num=osu1500336630858748

Abstract Details

2017, Doctor of Philosophy, Ohio State University, Electrical and Computer Engineering.
Electron-plasmonic devices are of strong interest for terahertz applications. In this work, we develop rigorous computational tools using finite difference time domain (FDTD) methods for accurate modeling of these devices. Existing full-wave-hydrodynamic models already combine Maxwell's and hydrodynamic electron-transport equation for multiphysical hybrid modeling. However, these multilevel methods are time-consuming as dense mesh is required for plasmonic modeling. Therefore, they are not suited for design and optimization. To address this issue, we propose new iterative ADI-FDTD-hydrodynamic hybrid coupled model. The new implementations provide time-efficient, yet accurate, modeling of these devices. It is demonstrated that for a typical simulation, up to 50% reduction in simulation-time is achieved with a nominal 3% error in calculations. Using the new tool-set, we investigate several devices that operate using the properties of 2D electron gas (2DEG). We provide one of the first multiphysical numerical analyses of these devices, giving accurate estimates of their terahertz performance. The developed tool allows simulation of arbitrary 2DEG based terahertz devices, providing useful and intuitive 2D field information. This has allowed understanding of the operation and radiation principles of these devices. Specifically, we examine the known plasma-wave instability in short-channel high electron mobility transistors (HEMTs) that leads to terahertz emissions at cryogenic temperatures. We also examine terahertz emitters that exploit resonant tunneling induced negative differential resistance (NDR) in HEMTs. Finally, using this tool we numerically demonstrate the existence of acoustic and optical-plasmonic modes within 2DEG bilayer systems in HEMTs. Methods for exciting and controlling these modes are also discussed enabling new physics among bilayer devices.
John Volakis (Advisor)
Siddharth Rajan (Advisor)
Kubilay Sertel (Committee Member)
Teixeira Fernando (Committee Member)
Niru Nahar (Committee Member)
Karin Musier-Forsyth (Committee Member)
152 p.
Electrical Engineering; Plasma Physics
Plasma-wave, electron plasmonics, 2D electron gas, mutliphysical, computational , FDTD, hydrodynamic, terahertz radiation, terahertz detectors, terahertz sources, graphene modeling, hybrid model, full-wave modeling, HEMT, FET

Recommended Citations

Citations

  • Bhardwaj, S. (2017). Hybrid Numerical Models for Fast Design of Terahertz Plasmonic Devices [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1500336630858748

    APA Style (7th edition)

  • Bhardwaj, Shubhendu. Hybrid Numerical Models for Fast Design of Terahertz Plasmonic Devices. 2017. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1500336630858748.

    MLA Style (8th edition)

  • Bhardwaj, Shubhendu. "Hybrid Numerical Models for Fast Design of Terahertz Plasmonic Devices." Doctoral dissertation, Ohio State University, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=osu1500336630858748

    Chicago Manual of Style (17th edition)

osu1500336630858748
336
© 2017, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.