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 20 for “"Nanoantennas"”.
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Mirror-Coupled Nanoantennas with Hexagonal-Boron Nitride Spacers
… range of optical resonators. Combining plasmonic nanoantennas with such resonators enables the formation of nanoscale optical resonances. The novel nano-optics observed by combining these heterostructures with optically active media is laying the foundations for devices such as ultra-high …
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Optical Nanoantennas for Ultrafast Nonlinear Spectroscopy of Individual Nanosystems
Die Arbeit befasst sich mit der ultraschnellen nichtlinearen Dynamik verschiedener Prozesse in individuellen metallischen und halbleitenden Nanostrukturen, ohne die Mittlung über Ensembles. Nanoobjekte mit einer Größe von nur wenigen Nanometern zeigen außergewöhnliche lineare wie auch nichtlineare …
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Plasmonic nanoantennas for multipurpose particle manipulation and enhanced optical magnetism
… in the nanometer-sized gaps of plasmonic nanoantennas are orders of magnitude larger than those of conventional optical tweezers. Accordingly, plasmon-enhanced gradient forces can both significantly relax constraints for microparticle manipulation and offer a route for improved …
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Pillar-supported plasmonic nanoantennas for optical nanotweezers and optical audio applications
… the nanometer-sized gaps of plasmonic bowtie nanoantennas (BNAs) are orders of magnitude larger than those of conventional optical tweezers. Accordingly, plasmon-enhanced gradient forces can both significantly relax constraints for microparticle manipulation and offer a route for improved …
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Mid-IR plasmon-mediated photoluminescence from gallium-doped zinc oxide bow-tie nanoantennas
… a two-dimensional periodic array of bow-tie nanoantennas patterned on various mid-IR emitters. Thin films of GZO are grown by pulsed laser deposition and are characterized electrically and optically, with the extracted material parameters used as inputs in our simulations. GZO plasmonic …
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Optical Nanoantennas Integrated with 3D Microelectrode Arrays: Hybrid Photonic-Electronic Modalities for Nano-Bio Interfacing
The human body is dynamic and understanding such complexity for accurate diagnostics and therapies remains a challenge due to lack of minimally-invasive biotechnologies capable of long-term measurements of various biochemical and bioelectrical signals simultaneously from single cells to cell …
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Fabrication and applications of pillar bowtie nanoantenna arrays
… theory to reduce the gap between pillar bowtie nanoantennas using SEM and experimentally show gap size controllability using a combination of accelerating voltage, current and magnification of SEM. Recording near field optical intensity in our nanostructure has been explained via simulation, …
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Lightwave Electronics Based on Nanoantenna Networks
… thesis underscores the pivotal role of metallic nanoantennas as a scalable platform for lightwave electronics. It demonstrates how metallic nanoantennas enable control over light field-driven responses through rectification, resonance control (leading to lower peak fields required to operate), …
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Flat optics based on patterned nanostructures for concentrating light
… both nanostructured plasmonic or metal nanoantennas with deeply subwavelength features, and dielectric nanostructured surfaces that are fabricated by two-photon lithography. In the former case, we developed pillar-supported Au bowtie nanoantennas (pBNAs), and found that light …
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Plasmonic Nanostructures: Optical Nanocircuits, Tunable Charge Transfer Plasmons, and Properties of Fano Resonant Nanoclusters
… nanocircuits that tune the resonance of the nanoantennas at visible wavelengths. Series and parallel combinations of nanocircuit elements (nanocapacitors, nanoinductors and nanoresistors) can be realized by appropriately loading specific arrangements of dielectric, semiconducting and metallic …
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Extraordinary light-induced local field, angular momentum and force near metallic nanoparticles
… the past decade. Here we show several different nanoantennas for SEIRA detection, which exhibit an order of magnitude greater SEIRA sensitivity than previous record-setting designs. We also consider that plasmonic nanoparticles can induce remarkably large electromagnetic field gradients near …
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Free-electron-driven nanoscale light sources: from Hertzian antennas to metamaterials
… gap resemble conventional radio dipole antennas. Nanoantennas, driven by electron beam produce emission in the visible part of the spectrum. I show that these nanoantennas are most efficiently fed in the region of closest proximity between their two elements, in particular, where the light density …
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Light-matter interactions in all-dielectric silicon nanoresonators
… mirrors for optical and infrared wavelengths, nanoantennas, molecular spectroscopy, surface-enhanced Raman spectroscopy (SERS) and subwavelength cavities.
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Plasmonic and Superconducting Self-Assembled MBE Grown Indium Islands
… will be presented and compared to those of nanoantennas constructed from standard fabrication processes. The coupling between near-surface quantum confined structures, both fabricated and self-assembled, will be compared to the coupling in typical dielectric cavities, such as photonic …
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Infrared Energy Conversion in Plasmonic Fields at Two-Dimensional Semiconductors
… of LSPR in heterostructures of noble metal nanoantennas and molybdenum- or tungsten-disulfide (MoS2; WS2) monolayers were examined by parallel synthesis of (i) DDA electrodynamic simulations and (ii) near-field electron energy loss (EELS) and far-field optical transmission UV-vis …
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Integrated optical phased arrays for lidar applications
… In this work, we first propose two metallic nanoantennas to couple between a waveguide mode to free space radiation. Then, by combining existing Si photonic components like directional couplers and modulators with optical antennas and phase shifters that were designed for this goal we …
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Studies on Optically Induced DC-Voltage in Thin Film Structures
… molecular rectifiers can also be used as optical nanoantennas to harvest the light and convert it into a DC-potential difference, which may be practical for energy production. I discuss the design, rectification processes, and propos two antenna fabrication procedures: electrochemical deposition …
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Towards efficient three-dimensional wide-angle beam propagation methods and theoretical study of nanostructures for enhanced performance of photonic devices
… the usefulness of core-shell nanostructures as nanoantennas to enhance light absorption of thin-film amorphous silicon solar cells. An increased absorption up to 33 % has theoretically been demonstrated.
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Multimaterial multifunctional fibers for biomedical applications
… plasmonic nanostructures can serve as optical nanoantennas to achieve ultrasensitive bio-/chemical sensing. But due to the limitation of the sensing mechanism, it is hard to perform the plasmonic sensing in live animals. Moreover, the relatively poor electrical performance of the electrode …
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Interactions of Organic Fluorophores with Plasmonic Surface Lattice Resonances
… by Lattice Resonances in Plasmonic Crystals of Nanoantennas. <em>Phys. Rev. Lett.</em> <strong>2009</strong>, <em>102</em> (14), 146807. https://doi.org/10.1103/PhysRevLett.102.146807.</p> <p>(6) Hoang, T. B.; Akselrod, G. M.; Yang, A.; Odom, T. W.; Mikkelsen, M. H. Millimeter-Scale Spatial …