Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 28 for “"Plasmonic Structures"”.
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Designing plasmonic structures
… results used in the design of various photonic structures. The emphasis of this thesis is in the theoretical and computational methods employed in the design. Many structures were fabricated and experimentally characterized confirming simulation results. Theoretically, surface plasmons (SPs) or …
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Simulation methods for plasmonic structures
… The interaction of light with metallic nanostructures produces a collective excitation of conduction electrons at the metal surface, also known as surface plasmons. These plasmonic resonances enable an unprecedented control of light by confining the electromagnetic field to regions well …
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Imaging and Control of Heat Generation at the Nanoscale Using Plasmonic Structures
Plasmonic nanostructures appear in a variety of applications and devices thanks to their spectral tunability, hot carrier generation, enhanced emission, and their ability to confine electromagnetic fields at volumes smaller than the diffraction limit of light. Despite their utilization and the vast …
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Nanolaminate coatings to improve long-term stability of plasmonic structures in physiological environments
The unprecedented ability of plasmonic metal nano-structures to concentrate light into deep-subwavelength volumes has propelled their use in a vast array of nanophotonics technologies and research endeavors. They are used in sensing, super-resolution imaging, SPP lithography, SPP assisted …
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Nanolaminated Plasmonics: from Passive to Active Nanophotonics Devices
Plasmonics can achieve the tight optical confinement and localization in the subwavelength domain. Surface plasmon polaritons (SPPs) are closely related to coupling to emitters in excitation and emission, waveguiding, and active modulating on the nanoscale. Due to these phenomenon, plasmonic …
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Quantitative Multispectral Biosensing and Imaging Using Plasmonic Crystals
… reflection or transmission configurations. These plasmonic structures exhibit multiple resonances that can be leveraged in sensing applications using multispectral analysis protocols. This thesis describes two new types of low-cost plasmonic crystal sensors formed by soft UV nanoimprint …
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Engineered Plasmonic Nanostructures for Infrared Spectroscopy, Refractive Index Sensing and Nonlinear Optics
… interaction in metal nanoparticles and nanostructures – has been the topic of intense research activities for many years. Early researchers studied the dependence of plasmon resonance frequency on the size, shape and dielectric environment of the nanoscale system, mainly for sensing …
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Investigation of Anisotropic Heat Transport Through Frequency Domain Thermoreflectance Technique
… including transistors, lasers, sensors, and plasmonic structures. In this thesis, I examine the characterization of heat transport in anisotropic materials through frequency domain thermoreflectance (FDTR) technique. Firstly, I describe the experimental setup and numerical modeling of the …
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Numerical Modelling of Plasmonic Waveguides
Plasmonics play an essential role now in the area of compact on chip optical systems; this is due to their unique characteristics and the ability of guiding light below the diffraction limit. Moreover, the integration between optical systems and electronic systems can be realised using those …
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Polarization Conversion Mediated Surface Plasmon Polaritons in Extraordinary Optical Transmission through a Nanohole Arrays
… the role of polarization, in general periodic plasmonic structures. Our model predicts that under certain conditions polarization conversion should occur in EOT light transmitted through the nanohole array. We experimentally measure polarization conversion in EOT and compare the experimentally …
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Detectivity vs. Sensitivity: Non-Hermitian Metasurface Sensor
… between the detectivity and sensitivity of a plasmonic sensor. Plasmonic sensors are popular for their high sensitivity arising from large local field enhancements. However, their Q-factors are bad resulting in low detectivity for limited power-budget situations. This problem can be alleviated …
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Dynamic Plasmonic Systems with Actuating Nanotransducers
… power for driving these machines. In this work, plasmonic nanoparticles coated with thin thermoresponsive polymeric shells actuate in response to light to give rapid, dynamic optical and mechanical responses. They are called actuating nanotransducers (ANTs). Their fast, reversible response and …
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Finite element characterisation of plasmonic waveguides in terahertz and optical frequencies
In recent years plasmonic devices have become an interesting area of research due to the sub-wavelength confinement and propagation of radiation, allowing the design of very compact structures. Compact structures are necessary to make smaller integrated optical circuits. Due to the use of metals, …
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Multi-Physics Modeling of Terahertz and Millimeter-Wave Devices
… materials, and large dimensions of optical structures that prohibit their integration into nano-size packages, respectively. In order to address these issues, the application of surface plasmons (SPs) is mostly suggested to advance plasmonic devices and make this area comparable to photonics …
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Interaction of Light and Conjugated Polymers in Plasmonic Nanogaps
… Integrating conjugated polymers into plasmonic nanocavities has unlocked electrochromic plasmonic coloration with nano-scale resolution display potential and has served as a platform for nanoscale mechanism characterization. This thesis focuses on the electrochromic nanoparticle on …
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FDTD Analysis of Plasmonic and Nanojet Enhanced Photodetectors for Improved Performance
… at near-infrared (NIR) wavelengths by way of plasmonics or photonic nanojets. The response time of photodiodes is primarily limited by two factors: (1) the transit time of photo-generated carriers to the electrode and (2) depletion layer capacitance of the semiconductor. The former requires a …
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Let there be (more) light : a study of tungsten based 2D semiconductor-plasmonic hybrid structures
… enhancing the emission of WS₂ and WSe₂ using Ag structures. Two sets of experiments are presented. The first set studied WS₂-Ag structure hybrids. We varied the thickness of a dielectric spacer that is positioned between monolayer WS₂ and a Ag film to observe how it affects the photoluminescence …
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Engineering Application-Specific Plasmonic Nanoparticles: Quantitative Measurements and Precise Characterization
… are discussed and characterized. These novel structures are akin to nanowires, but with a small, rectangular cross-sectional geometry. Gold nanobelts are shown to exhibit a strong transverse resonance that has never been reported previously in nanowires. The transverse resonance is shown to …
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Investigation of optical near field using near field scanning optical microscopy
… to explore the near field distribution of metal plasmonic nanostructures.^ Ridge apertures with shapes like bowtie and C can be used to focus light into sub-diffraction limit spot with enhancement. This localization of the field near the exit of a bowtie aperture is investigated with a home built …
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Plasmonic devices for manipulating light at the nanoscale: slow-light waveguides and compact couplers
In this dissertation, I explore new plasmonic structures and devices for manipulating light at the nanoscale: slow-light waveguides and compact couplers. I first introduce a plasmonic waveguide system, based on a plasmonic analogue of electromagnetically induced transparency (EIT), which supports a …
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