Linear approximation of the coherence function of a white-light source for efficient phase-shifting interferometry

1996 ◽  
Author(s):  
Patrick Sandoz
Keyword(s):  
Light Source ◽  
Linear Approximation ◽  
White Light ◽  
Coherence Function ◽  
Phase Shifting ◽  
White Light Source ◽  
Phase Shifting Interferometry

scholarly journals Author Correction: Crystal structure and optical properties of a high-density InGaN nanoumbrella array as a white light source without phosphors

2021 ◽  
Vol 13 (1) ◽  
Author(s):  
Tetsuya Kouno ◽  
Masaru Sakai ◽  
Katsumi Kishino ◽  
Akihiko Kikuchi ◽  
Naoki Umehara ◽  
...  
Keyword(s):  
Crystal Structure ◽  
Optical Properties ◽  
Light Source ◽  
White Light ◽  
High Density ◽  
White Light Source

A Correction to this paper has been published: https://doi.org/10.1038/s41427-021-00298-9

scholarly journals 6 nm super-resolution optical transmission and scattering spectroscopic imaging of carbon nanotubes using a nanometer-scale white light source

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Xuezhi Ma ◽  
Qiushi Liu ◽  
Ning Yu ◽  
Da Xu ◽  
Sanggon Kim ◽  
...  
Keyword(s):  
Light Source ◽  
Hyperspectral Imaging ◽  
White Light ◽  
Optical Transmission ◽  
Super Resolution ◽  
Strain Engineering ◽  
Optical Methods ◽  
Material Research ◽  
Halogen Lamp ◽  
White Light Source

AbstractOptical transmission and scattering spectroscopic microscopy at the visible and adjacent wavelengths denote one of the most informative and inclusive characterization methods in material research. Unfortunately, restricted by the diffraction limit of light, it cannot resolve the nanoscale variation in light absorption and scattering, diagnostics of the local inhomogeneity in material structure and properties. Moreover, a large quantity of nanomaterials has anisotropic optical properties that are appealing yet hard to characterize through conventional optical methods. There is an increasing demand to extend the optical hyperspectral imaging into the nanometer length scale. In this work, we report a super-resolution hyperspectral imaging technique that uses a nanoscale white light source generated by superfocusing the light from a tungsten-halogen lamp to simultaneously obtain optical transmission and scattering spectroscopic images. A 6-nm spatial resolution in the visible to near-infrared wavelength regime (415–980 nm) is demonstrated on an individual single-walled carbon nanotube (SW-CNT). Both the longitudinal and transverse optical electronic transitions are measured, and the SW-CNT chiral indices can be identified. The band structure modulation in a SW-CNT through strain engineering is mapped.

scholarly journals Light scattering of glass-particle filled matrices with similar refractive index

2018 ◽  
Vol 52 (30) ◽  
pp. 4231-4246 ◽  
Author(s):  
Wolfgang Wildner ◽  
Dietmar Drummer
Keyword(s):  
Refractive Index ◽  
Light Source ◽  
White Light ◽  
Scattered Light ◽  
Glass Particle ◽  
Refractive Indices ◽  
Mechanical And Thermal Properties ◽  
White Light Source ◽  
Transmission Measurements ◽  
Optical Appearance

If fillers can be added to transparent materials without losing transparency, then advantages like enhanced mechanical and thermal properties can be integrated. The investigated specimens consist of glass particles and refractive index oil as a model for transparent matrices with a very similar refractive index. Their optical properties and resulting limitations are described. Potential uses are also demonstrated by application-oriented optical testing. Besides a standard spectrometer, additional spectrometer setups were used. These include a diffuse as well as a collimated illumination and different sample positioning. Furthermore, the scattered light intensity was measured at different angles. This analysis reveals that composites with smaller particles transmit more light directly. In contrast, standard spectrometers indicate an increasing direct transmittance of composites with larger particles. They collect significant amounts of scattered light and, therefore, are not suitable for transmission measurements of such composites. The different positioning shows that all specimens exhibit very little scattering when placed directly on a diffuse light source. With a greater distance between specimen and light source, the scattering increases strongly. To display the composites' optical appearance, the light-dark-contrast of the diffuse white light source photographed behind the composite was analyzed. Both long and short distances between composite and light source lead to a precise image of the light source. Nevertheless, the white light source appears in the color of the wavelength with matching refractive indices at long distances.

Structure Determination of a New Molecular White-Light Source

2018 ◽  
Vol 255 (11) ◽  
pp. 1800083 ◽  
Author(s):  
Benjamin D. Klee ◽  
Eike Dornsiepen ◽  
Jens R. Stellhorn ◽  
Benedict Paulus ◽  
Shinya Hosokawa ◽  
...  
Keyword(s):  
Light Source ◽  
White Light ◽  
Structure Determination ◽  
White Light Source

Study on LEDs Synthesized High Color Rendering Index White Light Source

2016 ◽  
Vol 36 (3) ◽  
pp. 0323003
Author(s):  
胡奕彬 Hu Yibin ◽  
庄其仁 Zhuang Qiren ◽  
刘士伟 Liu Shiwei ◽  
赖传杜 Lai Chuandu
Keyword(s):  
Light Source ◽  
White Light ◽  
White Light Source ◽  
Color Rendering Index ◽  
Color Rendering
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