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 14 of 14 for “"field confinement"”.
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The solar tachocline: a self-consistent model of magnetic confinement
… focus on angular momentum balance and magnetic field confinement within the tachocline. In Part I we review current knowledge of the Sun's rotation. We summarise the main mechanisms by which angular momentum is transported within the Sun, and discuss the difficulties in reconciling the observed …
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Design, fabrication, and characterization of high-speed light-emitting transistors and microcavity lasers
… small aperture buried-oxide current and field confinement is also demonstrated with wider mode spacing and faster carrier recombination lifetime (enhanced Purcell factor ~ 2 to 8 times, but still limited cavity), lower threshold current, larger side mode suppression ratio, and higher …
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Plasmon-powered Nanochemistry
… nanocavities are shown to further enhance the field-confinement. Such extremely confined light is then utilised to monitor single-molecule surface coordination dynamics in real-time. From bulk solution down to single-molecule, a range of systems are demonstrated to illustrate the powerful …
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Pillar-supported plasmonic nanoantennas for optical nanotweezers and optical audio applications
… momentum transfer from confined electromagnetic fields within micro- and nanoscale objects to form non-invasive probes that serve to provide piconewton forces and detect motion with angstrom-level precision. This technique was discovered in the 1980s and has been found useful in a variety of …
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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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Temporal dynamics of hot-electrons in metal films and alloys
… measurements, we combine the internal electric field profile resulting from surface plasmon coupling with the conventional two-temperature model. Our results show that coupling to the propagating surface plasmon enhances the hot-carrier relaxation time due to the electric field confinement …
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Nanoscale Control of Gap-plasmon Enhanced Optical Processes
… years. The strong plasmon-mediated electric field enhancement and field confinement well beyond the diffraction limit has been demonstrated to improve the performance of optical devices including ultrasensitive sensors, light emitters, and optical absorbers. A plasmon resonance mode of …
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Theoretical investigation of metal-cavity nanolasers and nanoLEDs and comparison with experiments
… shows the enhancement of metal on the optical field confinement and the reduction of the radiation loss from metal. The threshold material gain can be improved by one third compared with that of the same cavity without metal encapsulation. On the other hand, due to the dispersive …
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An experimental study of light-material interaction at subwavelength scale
… nanotechnology offers a new perspective in the field of optics. The study of light-material interaction has evolved into a nanoscale regime with its dimension smaller than the wavelength of light. While there are pressing needs of optical applications with higher resolution and efficiency, one …
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Design and investigation of a novel 𝝿-configuration spr sensor for multi-parameter biosensing applications.
… refractive index enhanced the local evanescent field, boosting sensitivity from 12,600 nm/RIU in the Ag-analyte region to 20,000 nm/RIU in Ag-TiO2-analyte region. Furthermore, through nanoscale multilayer surface engineering, the sensor was modified to increase its sensing capabilities. …
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Investigations on the development of a novel hybrid sensor for environmental monitoring applications.
… envisaged integrating optical and electrical fields in addition to nanomaterials. This thesis reports investigations on enhancing the sensitivity/selectivity through optical, nanomaterials and electrochemical routes, and then integrating these to realise a hybrid sensor. A novel optical sensor …
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Plasmonic nanoantennas for multipurpose particle manipulation and enhanced optical magnetism
… of momentum from confined electromagnetic fields to micro- and nanoscale objects. Optical tweezers, based on the use of high-numerical aperture objective lenses, take advantage of this phenomenon to form non-contact probes that are capable of applying piconewton forces and detecting motion …
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Nonlinear optical emission and near-field enhancement effects in arrays of gold bowtie nano-antennas
… investigates the effects of the large near-field intensity enhancements from periodic arrays of gold bowtie nano-antennas (BNAs) after illumination by laser light. Specifically, we focus on laser-induced damage, nonlinear optical emission, and a proof-of-concept for utilizing arrays of gold …