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iDEA: DREXEL LIBRARIES E-REPOSITORY AND ARCHIVES

iDEA: DREXEL LIBRARIES E-REPOSITORY AND ARCHIVES

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Design and application of plasmonic devices

Details
Title
Design and application of plasmonic devices
Author(s)
Grote, Richard
Advisor(s)
Nabet, Bahram
Keywords
Electric engineering; Plasmons (physics); Polaritons
Date
2008-08
Publisher
Drexel University
Thesis
M.S., Electrical Engineering -- Drexel University, 2008
Abstract
Surface Plasmon Polaritons (SPPs) are quantized charge density oscillations that occur at the interface between a metal and a dielectric when a photon couples to the free electron gas of the metal. The extraordinary properties of SPPs allow for sub-di raction limit waveguiding and localized eld enhancement, neither of which are achievable by any other means. The emerging eld of Surface Plasmonics has applied SPP coupling to a number of new and interesting applications, such as: Surface Enhanced Raman Spectroscopy (SERS), Super Lenses, nano-scale optical circuits, optical lters, photonic band gap structures, biological and chemical sensing, and SPP enhanced photodetectors.The focus of this thesis is on the modeling, design and fabrication of plasmonic devices. A comparison of di erent models for the dielectric function of the metal, gold in this case, in optical frequencies is presented for the purpose of accurately modeling metallic dispersion through Finite- Di erence Time-Domain (FDTD) simulations. The fabrication, measurement, and simulation of SPP Bragg grating coupling devices are performed for both linear and circular geometries. Finally, these gratings are added to the two gold contacts of a metal-semiconductor-metal photodetector designed on Gallium Arsenide for an operating wavelength of 830 nm to create a SPP enhanced Photodetector. The device is optimized using FDTD simulations to maximize the eld enhancement, fabricated by E-beam lithography and tested with femtosecond time response studies.
URI
http://hdl.handle.net/1860/2916
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Theses, Dissertations, and Projects

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