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|Title:||APPLICATIONS OF PLASMONICS FOR TERAHERTZ DETECTION, MODULATION AND WAVEGUIDING||Authors:||HOU HAOWEN||Keywords:||Terahertz, Plasmonics, GaN, HEMT||Issue Date:||13-Jan-2017||Citation:||HOU HAOWEN (2017-01-13). APPLICATIONS OF PLASMONICS FOR TERAHERTZ DETECTION, MODULATION AND WAVEGUIDING. ScholarBank@NUS Repository.||Abstract:||Terahertz technology had been widely explored for applications in homeland security, nondestructive testing, and ultra-broadband communication. To realize these applications, efficient terahertz detector, terahertz waveguides, and novel terahertz modulator are needed. In this thesis, we explore the use of plasmonics to achieve these functions. We first report a sub-terahertz (THz) plasmonic detector with nano-antennas, which shows excellent performance with maximum responsivity of 15 kV/W (1.8 times enhancement) at room temperature and a responsivity of 2.7 kV/W at 200 ℃. In addition, the introduction of a Fabry-Pérot (FP) cavity in enhancing the responsivity of the plasmonic terahertz detector achieved a 2.5 times enhancement. What’s more, edge plasmons on graphene nano-ribbon waveguides and its cut-off behavior of this waveguide is investigated. Finally, plasmonic terahertz modulator based on an array of graphene disks fabricated on the silicon substrate is demonstrated.||URI:||http://scholarbank.nus.edu.sg/handle/10635/135815|
|Appears in Collections:||Ph.D Theses (Open)|
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