Semiconductor surface plasmons: a route to terahertz waveguides and sensors

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Semiconductor surface plasmons: a route to terahertz waveguides and sensors

Show simple item record Stone, Edmund K. en_US 2012-06-13T10:14:11Z en_US 2013-03-21T10:34:27Z 2012-03-29 en_US
dc.description.abstract The terahertz regime has until recently been some what neglected due to the difficulty of generating and measuring terahertz radiation. Terahertz time domain spectroscopy has allowed for affordable and broadband probing of this frequency regime with phase sensitive measurements (chapter 3). This thesis aims to use this tool to add to the knowledge of the interactions between electromagnetic radiation and matter specifically in regard to plasmonics. This thesis covers several distinct phenomena related to plasmonics at terahertz frequencies. The generation of terahertz radiation from metal nanoparticles is first described in chapter 4. It is shown that the field strength of the plasmon appears to relate to the strength of the generated field. It is also shown that the power dependence of the generated terahertz radiation is not consistent with the optical rectification description of this phenomenon. An alternative explanation is developed which appears more consistent with the observations. A simple model for the power dependence is derived and compared to the experimental results. In chapter 5 the parameters that make good plasmonic materials are discussed. These parameters are used to assess the suitability of semiconductors for terahertz surface plasmon experiments. The Drude permittivity of InSb is measured here, leading to a discussion of terahertz particle plasmons in chapter 6. Finite element method modelling is used to show some merits of these over optical particle plasmons. This also includes a discussion of fabrication methods for arrays of these particles. Finally, chapter 7 is a discussion of so called spoof surface plasmons. This includes some experimental work at microwave frequencies and an in depth analysis of open ended square hole arrays supported by model matching method modelling. Perfect endoscope effects are discussed and compared to superlensing. The thesis ends with a brief conclusions chapter where some of the ideas presented are brought together. en_GB
dc.description.sponsorship EPSRC en_GB
dc.identifier.citation The generation of terahertz radiation from plasmonic nanoparticle arrays, D. K. Polyushkin, E. Hendry, E. K. Stone, and W. L. Barnes, Nano Lett., 2011, 11 (11), 4718 en_GB
dc.identifier.citation Dispersion of spoof surface plasmons in open-ended metallic hole arrays, E. K. Stone, and E. Hendry, Phys. Rev. B 84, 035418 (2011) en_GB
dc.identifier.grantnumber EP/F026757/1 en_GB
dc.identifier.uri en_US
dc.language.iso en en_GB
dc.publisher University of Exeter en_GB
dc.subject THz en_GB
dc.subject terahertz en_GB
dc.subject plasmonics en_GB
dc.subject particle plasmon en_GB
dc.subject LSPR en_GB
dc.subject surface plasmon en_GB
dc.subject SPP en_GB
dc.subject semiconductor en_GB
dc.subject InSb en_GB
dc.subject generation en_GB
dc.title Semiconductor surface plasmons: a route to terahertz waveguides and sensors en_GB
dc.type Thesis or dissertation en_GB 2012-06-13T10:14:11Z en_US 2013-03-21T10:34:27Z
dc.contributor.advisor Hendry, Euan en_US
dc.publisher.department Physics en_GB
dc.type.degreetitle PhD in Physics en_GB
dc.type.qualificationlevel Doctoral en_GB
dc.type.qualificationname PhD en_GB

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