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 18 of 18 for “"absorption enhancement"”.
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Scattering design : absorption enhancement and frequency selective metasurfaces
… approximate angle/ frequency-averaged limits on absorption enhancement due to multiple scattering from arrays of "metaparticles", applicable to general wave-scattering problems and motivated here by ocean-buoy energy extraction. We show that general limits, including the well known Yablonovitch …
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Absorption enhancement of plasmonic thin film solar cell combined with nanocavity
… a lot of attention from researchers for their absorption capabilities. This study focused on the design of plasmonic thin film solar cell so that the absorption can be optimized. The structures were developed with different materials, geometries and configurations through Finite Element Method …
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Local absorption enhancement of light in tailored disordered amorphous silicon thin-films
… to their light trapping capabilities and local absorption. Computational optimization of thin films leads to design guidelines by which several nanotextures are fabricated. The investigation of the fabricated nanotextures via short laser pulse excitation reveals localized modes that …
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Sustainable atmospheric ammonia synthesis and nitrogen fixation using non-thermal plasma (NTP)
… catalyst improvement, system development, and absorption enhancement. For the catalyst improvement, a multi-functional catalyst was introduced and deposited onto various supporting materials. For absorption enhancement, MgCl2 was implemented for the absorption enhancement, taking advantage of …
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Multiphase Aging of Atmospheric Biomass Burning Brown Carbon
… thesis focused on elucidating the changes in absorption and chemical composition of biomass burning brown carbon aerosol from atmospheric aging. Targeting daytime photochemical aging by light exposure, we found that UVA light enhanced the ability of the particles to absorb visible light on …
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Physical and radiative properties of coated nanoparticle aggregates
… impact of these short-lived climate forcers. The absorption enhancement of non-uniformly lightly-coated BC is less pronounced than that of laboratory-generated particles and core-shell models, aligning more closely with field measurements. This highlights the influence of BC core and coating …
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Tailoring Optical and Plasmon Resonances in Core-Shell and Core-Multishell Nanowires
… semiconductor-metal-photocatalyst CMS NWs, the absorption within ultrathin (sub-50 nm) photocatalyst layers can be substantially enhanced. Notably, aluminum and copper based NWs provide absorption enhancement remarkably close to silver and gold based NWs respectively. Further, such absorption is …
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On Applications of Resonances, from One to Infinity
… we present approximate frequency/angle-averaged absorption enhancement bounds in the radiative transfer regime and apply the results to ocean buoy energy extraction. Our results, which match full-wave simulations, enable us to propose and quantify approaches to increase performance through …
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Solid Dispersions in Medium-Insoluble Hydrogels for Enhancing the Solubility and Bioavailability of Poorly Soluble Drugs
… these test carriers can provide similar oral absorption enhancement. Further optimization of ASDs in water-insoluble carriers is still required before they can be employed as alternative strategies for bioavailability enhancement.
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A fundamental study of epitaxial graphene on silicon carbide on silicon for mid-infrared nanophotonics
… of graphene and silicon carbide can enhance MIR absorption, detected field strength, and confinement. In particular, the possibility of combining the tunable nature of graphene surface plasmon polaritons (SPPs) with low loss surface phonon polaritons (SPhPs) supported in SiC offers great promise. …
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Ultra-thin photovoltaic technologies with nanophotonic textures for enhanced solar energy harvesting
… related to the efficiency of sunlight absorption and power generation. Maximising the absorption of sunlight in ultra-thin solar cells requires careful optimisation of the full device design, tailored to minimise i) front surface reflection by means of antireflection coatings, ii) …
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In Situ Characterization of Optical Absorption by Carbonaceous Aerosols: Calibration and Measurement
Light absorption by aerosols has a great impact on climate change. A Photoacoustic spectrometer (PA) coupled with aerosol-based classification techniques represents an in situ method that can quantify the light absorption by aerosols in a real time, yet significant differences have been reported …
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Photodetection using ultrathin metal films
… and solar cells. However, silicon's lack of absorption in the infrared limits its use in infrared detectors and imaging sensors, severely constraining its implementation in telecommunications for low-cost integrated optical circuitry. In this thesis, we show that this limitation can be …
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Multispectral plasmon enhanced quantum dots in a well infrared photodetectors
… indicate the presence of several modes of absorption, which can be tuned by changing the pitch of the pattern. Enhancement of absorption is predicted for the detector. Experimental demonstration show spectral tuning in MWIR and LWIR regions and a peak absorption enhancement of 4.9x. By …
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Functional gel for directed molecular transport and sensor applications
… chemical gradient with a >50-fold concentration enhancement relative to the surrounding area. In addition to the size effect on the analyte collection capability, we can also well control the position of chemical gradient and print an array of micro-scale chemical gradients on the same substrate. …
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Thin-film silicon solar cells : photonic design, process and fundamentals
… Si solar cells critically depends on optical absorption in the silicon layer since silicon has low absorption coefficient in the red and near-infrared (IR) wavelength ranges due to its indirect bandgap nature. This thesis aims at understanding, designing, and fabricating novel photonic …
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Surface plasmons for enhanced metal-semiconductor-metal photodetectors
… limit waveguiding and localized field enhancement. The emerging field 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 filters and SPP …
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Nasal delivery of peptides using powder carriers based on starch/poly(acrylic acid)
… remains low. In Chapter 1 the barriers to nasal absorption of peptides are described. The strategies which have been described in literature to circumvent the nasal barriers are also mentioned. This research project focused on powder formulations as carriers for the nasal delivery of peptides, …