Subwavelength imaging using plasmonic lenses at terahertz frequencies

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dc.contributor.authorHeggie, Tanner
dc.contributor.supervisorNaylor, David A.
dc.date.accessioned2015-01-15T23:14:54Z
dc.date.available2015-01-15T23:14:54Z
dc.date.issued2014
dc.degree.levelMastersen_US
dc.degree.levelMasters
dc.description.abstractThe effects of diffraction at terahertz frequencies limit the spatial resolution of imaging systems. One approach to achieve subwavelength resolution is near-field imaging using a subwavelength aperture, however, the low transmission through subwavelength apertures limits the sensitivity of this approach. Plasmonic lenses in the form of bullseye structures, consisting of a circular subwavelength aperture with concentric periodic corrugations, have demonstrated enhanced transmission and beam confinement. This thesis discusses the design criteria of plasmonic lenses optimized for 325 GHz. Fabrication for optical applications is traditionally achieved by nanolithography. Since the scale of plasmonic structures depends on the wavelength, precision micromilling techniques are well suited for terahertz applications. Theoretical simulations are obtained using a finite-difference time-domain solver and the performance the devices are evaluated using a customized terahertz testbed. The prospect of using plasmonic lenses in a terahertz imaging configuration for the diagnosis of cancer is also discussed.en_US
dc.identifier.urihttps://hdl.handle.net/10133/3618
dc.language.isoen_CAen_US
dc.proquest.subject0752en_US
dc.proquest.subject0607en_US
dc.proquest.subject0992en_US
dc.proquestyesYesen_US
dc.publisherLethbridge, Alta. : University of Lethbridge, Dept. of Physics and Astronomyen_US
dc.publisher.departmentDepartment of Physics and Astronomyen_US
dc.publisher.facultyArts and Scienceen_US
dc.relation.ispartofseriesThesis (University of Lethbridge. Faculty of Arts and Science)en_US
dc.subjectPlasmonicsen_US
dc.subjectTerahertzen_US
dc.subjectSurface plasmon polaritonsen_US
dc.subjectExtraordinary transmissionen_US
dc.subjectBullseye lensen_US
dc.subjectMicromillingen_US
dc.subjectSubwavelength imagingen_US
dc.titleSubwavelength imaging using plasmonic lenses at terahertz frequenciesen_US
dc.typeThesisen_US
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