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Showing 1 to 20 of 62 for “"Enhancement factor"”.
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Investigation of enhancement factor minimization with reciprocal temperature for binary mixtures containing helium and hydrogen, An
Includes bibliographical references (pages 104-108).
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Static and Dynamic Properties of Vertical -Cavity Surface -Emitting Lasers
… A novel method for estimating the linewidth enhancement factor in VCSELs is developed from the matching of theory and experiment. Two-mode competition in the VCSEL under feedback is also investigated.
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Structural and Functional Effects in Solutions With Pure and Entrainer-Doped Supercritical Solvents
… nonpolar supercritical solvents the predominant factor determining solubility is the volatility of the solute at the solution temperature. Of secondary importance is the effect of solute size, with larger solutes showing greater solubility enhancements, as defined by the dimensionless enhancement …
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Modal Properties and Spontaneous Emission Factor in Unstable-Resonator Semiconductor Lasers
… the unstable resonator, the spontaneous emission factor, defined as the ratio of the power of the spontaneous emission entering the lasing mode to the total power of the spontaneous emission, is much larger than that of a regular Fabry-Perot cavity of the same dimension. The large spontaneous …
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Study of Breakdown/arcing for High Power RF Antennas on Fusion Applications
… the emission current but increases the enhancement factor of copper electrodes. XeF 2 exhibits a self-extinguishing emission current behavior on copper and tungsten electrodes, which allows the electrodes to achieve higher hold-off voltages. To reveal the mechanism by which chemicals …
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Study of Type-I and Type-Ii Strained Quantum -Well Lasers
… on injection locking for measuring the linewidth enhancement factor is developed, and we extract the linewidth enhancement factor for the above three lasers. They are also calculated using the same parameters extracted from the gain spectra and agree with the experimental results very well. For a …
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Validation of the NPL gravimetric hygrometer
… has been validated to demonstrate its satisfactory performance as a primary standard for humidity within the UK national measurement system. The measurement performance of the gravimetric hygrometer has been characterised for mixing ratios within the range 0.01 g kg to 155 g kg 4 (equivalent …
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Surface enhanced Raman spectroscopy based on black silver and micro-pyramids array
… pyramids, which we call SERS pyramids. The Raman enhancement factor is calculated as 6.38$\times$10$^7$ for black silver and 1.6$\times$10$^6$ for SERS pyramids. In addition, two exemplary applications of black silver SERS substrates---the detection of contaminants leached from lab-use plasticware …
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THE SHEAR BEHAVIOUR OF THE REINFORCED CONCRETE FOUR-PILE CAPS
… longitudinal and transverse pile spacing, shear enhancement factor, and the width of the cap over which the shear enhancement factor is applied. The shear behaviour of pile caps is also influenced by the load patterns. In this research, the strut-and-tie method has been proved to be a more …
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Study on the photoelectric hot electrons generation and transport with metallic-semiconductor photonic crystals
… nm centered at 590 nm is observed. Photoresponse enhancement factor of 12.28 at 639 nm compared to a flat chip is also measured. Applications of these results could lead to low-cost and robust photoelectrochemical device such as full-spectrum solar water splitting.
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The effect of cumulative forward and single large-angle scattering of an electromagnetic wave in a random medium
… recently. He derives a formal expression for the enhancement factor of the electromagnetic flux at large angles (excluding backscatter) from an extended weakly random medium. Enhancement describes the factor by which the singly-scattered flux is modified when the effects of cumulative forward …
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Silicon-Germanium interdiffusion and its impacts on enhanced mobility MOSFETs
… x 1015 atoms/cm2. It is shown that the mobility enhancement factor is degraded by RTA and ion implantation. For each RTA condition, there is a threshold implantation dose, above which the strained Si mobility starts to degrade significantly. The degradation is larger for devices with higher …
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Injection locking characteristics of indium arsenide quantum dash lasers
… laser for the first time. The linewidth enhancement factor(α-parameter) of a QDash laser was measured using an injection locking technique that takes advantage of the asymmetry of the injection range. Studies were performed as functions of injecesed photon density, wavelength, and output …
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Tailored Materials for Surface-Enhanced Raman Spectroscopy
… population of thiol at the surface and the enhancement factor of the particle aggregates as aggregation progresses. It was therefore necessary to find conditions under which the aggregates would provide a stable enhancement factor and although a large number of colloid/salt combinations …
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Solid-state superionic stamping: Patterning 3D metallic micro- and nanostructures for surface enhanced Raman sensing
… essential attributes, including robust signal enhancement, reproducible and consistent response, and cost-effective scalability. This research introduces a highly sensitive, large-area silver SERS substrate patterned with a uniform array of 3D retroreflecting inverted micro- and nanoscale …
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Development of High-Performance Optofluidic Sensors on Micro/Nanostructured Surfaces
… found that meridian WGMs with intrinsic quality factor Q exceeding 104 can exist. Importantly, such meridian WGMs can be efficiently excited by a waveguiding structure embedded in the planar chip, which could significantly reduce the overall system complexity by eliminating conventional …
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External control of semiconductor nanostructure lasers
… high differential gain and modified linewidth enhancement factor. However, there are known intrinsic limitations associated with semiconductor laser dynamics that can hinder the performance including the mode stability, spectral linewidth, and direct modulation capabilities. One possible method …
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Optimization of photonic crystal enhanced fluorescence by excitation laser angle scanning
… scanners, but with a reduction in the obtainable enhancement factor. Using computer simulations and experimental measurements, we describe the interaction between the resonant bandwidth of a PCEF device surface and the optical design of the detection instrumentation that is used to provide …
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Scanning tunneling microscopy and spectroscopy of topological materials with broken symmetry
… dispersion and was used to determine the mass enhancement factor.
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Temperature-Dependent High-Speed Modulation and Wavelength Conversion Using Quantum-Well Lasers
… of linear gain, refractive index, and linewidth enhancement factor due to optical and electrical pumping are shown for Fabry-Perot lasers and semiconductor optical amplifiers. Gain spectra with and without an optical pump are measured; theoretical fits to the data and predicted carrier densities …
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