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Results for “Refraction”
Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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A study of the refractivity bias in occultation retrievals using end-to-end simulations
Direct Methanol Fuel Cells in portable applications are expected to provide substantially higher energy density and longer operating times over advanced batteries. The time threshold of advantage of using a fuel cell instead of a battery is almost independent of the power level, and is determined by the power density of the fuel cell and its operating efficiency.
SINGLE CRYSTAL DIAMOND COMPOUND REFRACTIVE LENS
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A mixing rule for imaginary parts of refractive indices of aerosols or colloids in the Rayleigh regime
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Comparing methods for measuring thickness, refractive index, and porosity of mesoporous thin films
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Dipole-like scattering by Rayleigh-sized particles with medium-matched real and general imaginary part of the refractive index
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Unraveling the Nature of Lasing Emission from Hybrid Silicon Nitride and Colloidal Nanocrystal Photonic Crystals with Low Refractive Index Contrast
Silicon nitride is used for its low optical loss and high thermal stability, making it a suitable platform for visible-light applications in integrated photonic devices. However, its application has been limited due to inefficient light emission, a problem addressed by integrating various types of light emitters onto the platform. In particular, the integration of solution-processable colloidal nanocrystals (NCs) as optical gain materials onto the silicon nitride platform is a promising route but requires a more solid theoretical footing. By leveraging 2D surface-emitting photonic crystal structures combined with NCs, we effectively confine and manipulate light to achieve lasing from green to red. Building on this, we model the light–matter interactions of the low index contrast NC/nitride platform, validated by extensive experimental validations through Fourier imaging techniques, revealing the full photonic band structure and showing clear mode congestion. Finally, these comprehensive studies confirm the potential of hybrid NC-based structures for fully integrated on-chip laser applications and indicate routes for further improvement.
Improved constraints on hematite refractive index for estimating climatic effects of dust aerosols
Abstract Uncertainty in desert dust composition poses a big challenge to understanding Earth’s climate across different epochs. Of particular concern is hematite, an iron-oxide mineral dominating the solar absorption by dust particles, for which current estimates of absorption capacity vary by over two orders of magnitude. Here, we show that laboratory measurements of dust composition, absorption, and scattering provide valuable constraints on the absorption potential of hematite, substantially narrowing its range of plausible values. The success of this constraint is supported by results from an atmospheric transport model compared with station-based measurements. Additionally, we identify substantial bias in simulating hematite abundance in dust aerosols with current soil mineralogy descriptions, underscoring the necessity for improved data sources. Encouragingly, the next-generation imaging spectroscopy remote sensing data hold promise for capturing the spatial variability of hematite. These insights have implications for enhancing dust modeling, thus contributing to efforts in climate change mitigation and adaptation.
Refractive index matched polymeric and preceramic resins for height-scalable two-photon lithography
Studying the effect of resin RI on print fidelity. Chemically modifying RI resins to demonstrate 3D structures print without height limitation resulting on ceramic and nonceramic print as tall as 2.5 mm with sub-micron features.
Sample Code for "An automated approach to the alignment of compound refractive lenses"
This sample code is intended to be publicly released on DOECODE. It is an accompaniment to "n automated approach to the alignment of compoundrefractive lenses". It's two small, mostly self-contained scripts that include the complete details necessary to implement the to-be published article's algorithm at a scientific beamline.
Complex angle isofrequency opening and reciprocity breaking in the refractive dual interface system
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Submicron focusing of high-energy X-rays with silicon saw-tooth refractive lenses – fabrication and aberrations: errata
Three (3) items of errata are submitted for our recently published paper [ Opt. Express 28 , 36505 ( 2020 ) 10.1364/OE.405566 ]. One is a clarifying extension to the Fig. 3 caption. Two are typographical corrections. The scientific results and conclusions are unaffected.