Refractiveindex.info database of optical constants

Polyanskiy, Mikhail N.

doi:10.1038/s41597-023-02898-2

Cited by 120 publications

(19 citation statements)

References 467 publications

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“…The refractive indices for polystyrene and SiliGlass were obtained from the literature. 21 , 28 , 29 The absorption coefficient of the polystyrene was measured by using the transmittance model on an empty cuvette with the expected content transmittance of 1.…”

Section: Methodsmentioning

confidence: 99%

“… 21 The refractive index of air was taken to be

, and the refractive index of

was obtained from the literature. 32 , 29 The result of the simulation is the scattering efficiency

of a sphere, which is related to the scattering cross-section of a particle

through its geometrical cross-section

where

is the diameter of the sphere. 23 The scattering coefficient

is then determined by multiplying the cross-section by the volume fraction of the scatterers: 22

where

is the volume fraction of the spheres.…”

Section: Methodsmentioning

confidence: 99%

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Effects of phantom microstructure on their optical properties

Stergar,

Hren,

Milanič

2024

J. Biomed. Opt.

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. Significance Developing stable, robust, and affordable tissue-mimicking phantoms is a prerequisite for any new clinical application within biomedical optics. To this end, a thorough understanding of the phantom structure and optical properties is paramount. Aim We characterized the structural and optical properties of PlatSil SiliGlass phantoms using experimental and numerical approaches to examine the effects of phantom microstructure on their overall optical properties. Approach We employed scanning electron microscope (SEM), hyperspectral imaging (HSI), and spectroscopy in combination with Mie theory modeling and inverse Monte Carlo to investigate the relationship between phantom constituent and overall phantom optical properties. Results SEM revealed that microspheres had a broad range of sizes with average and were also aggregated, which may affect overall optical properties and warrants careful preparation to minimize these effects. Spectroscopy was used to measure pigment and SiliGlass absorption coefficient in the VIS-NIR range. Size distribution was used to calculate scattering coefficients and observe the impact of phantom microstructure on scattering properties. The results were surmised in an inverse problem solution that enabled absolute determination of component volume fractions that agree with values obtained during preparation and explained experimentally observed spectral features. HSI microscopy revealed pronounced single-scattering effects that agree with single-scattering events. Conclusions We show that knowledge of phantom microstructure enables absolute measurements of phantom constitution without prior calibration. Further, we show a connection across different length scales where knowledge of precise phantom component constitution can help understand macroscopically observable optical properties.

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Section: Methodsmentioning

confidence: 99%

“… 21 The refractive index of air was taken to be

, and the refractive index of

was obtained from the literature. 32 , 29 The result of the simulation is the scattering efficiency

of a sphere, which is related to the scattering cross-section of a particle

through its geometrical cross-section

where

is the diameter of the sphere. 23 The scattering coefficient

is then determined by multiplying the cross-section by the volume fraction of the scatterers: 22

where

is the volume fraction of the spheres.…”

Section: Methodsmentioning

confidence: 99%

Effects of phantom microstructure on their optical properties

Stergar,

Hren,

Milanič

2024

J. Biomed. Opt.

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“…Chirped pulses were created through the inclusion of 3 sets of two 5 mm uncoated zinc selenide (ZnSe) windows (WG71050, Thorlabs Inc.) in Brewster pairs (to compensate lateral Snell shifts and minimize reflective losses). Using the measured pulse spectrum and phase as the input, the theoretical group delay dispersion (GDD) and third-order dispersion from the ZnSe windows were added to simulate the resulting chirped pulse duration using PyNLO 34 , 35 to be

. Due to reflective losses from the addition of the ZnSe windows, the highest available power for the chirped pulses was reduced to 335 mW.…”

Section: Methodsmentioning

confidence: 99%

Two-dimensional electro-optical multiphoton microscopy

Farinella,

Stanek,

Jayakumar

et al. 2024

Neurophoton.

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The development of genetically encoded fluorescent indicators of neural activity with millisecond dynamics has generated demand for ever faster two-photon (2P) imaging systems, but acoustic and mechanical beam scanning technologies are approaching fundamental limits. We demonstrate that potassium tantalate niobate (KTN) electro-optical deflectors (EODs), which are not subject to the same fundamental limits, are capable of ultrafast two-dimensional (2D) 2P imaging in vivo.Aim: To determine if KTN-EODs are suitable for 2P imaging, compatible with 2D scanning, and capable of ultrafast in vivo imaging of genetically encoded indicators with millisecond dynamics.Approach: The performance of a commercially available KTN-EOD was characterized across a range of drive frequencies and laser parameters relevant to in vivo 2P microscopy. A second KTN-EOD was incorporated into a dual-axis scan module, and the system was validated by imaging signals in vivo from ASAP3, a genetically encoded voltage indicator.Results: Optimal KTN-EOD deflection of laser light with a central wavelength of 960 nm was obtained up to the highest average powers and pulse intensities tested (power: 350 mW; pulse duration: 118 fs). Up to 32 resolvable spots per line at a 560 kHz line scan rate could be obtained with single-axis deflection. The complete dual-axis EO 2P microscope was capable of imaging a 13 μm by 13 μm field-of-view at over 10 kHz frame rate with ∼0.5 μm lateral resolution. We demonstrate in vivo imaging of neurons expressing ASAP3 with high temporal resolution. Conclusions:We demonstrate the suitability of KTN-EODs for ultrafast 2P cellular imaging in vivo, providing a foundation for future high-performance microscopes to incorporate emerging advances in KTN-based scanning technology.

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“…This data can used for analysis. All the materials considered, i.e., silver, lime glass and air are non-magnetic i.e., r m is equal to one [27].…”

Section: Design Formulationmentioning

confidence: 99%

A Scalable optical meta-surface glazing design for agricultural greenhouses

Lakshminarayanan,

Ranjbar,

Ibrahim

et al. 2024

Phys. Scr.

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Optical meta-surfaces allow controllable reflection and transmission spectra in both optical and infrared regions. In this study, we explore their potential in enhancing the performance of low-emission glazing designed for improved energy efficiency, for agricultural greenhouses in cold climates. The low-emission glazing employs thin film optics to retain heat by allowing solar radiation while reflecting radiation emitted by room-temperature objects. The incorporation of metamaterials that can be scalably manufactured and designed for capturing solar energy in the mid-infrared spectrum, offers an opportunity to further enhance the glazing's energy efficiency. We use the finite difference time domain (FDTD) method and the transfer matrix method to propose a metamaterial structure, with spherical silver nanoparticles and thin-films, and compare the performance of this proposed design against existing materials. The outcome of this study offers insights into the potential of metamaterials in optimizing the energy efficiency of cold-climate agricultural greenhouses.

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Refractiveindex.info database of optical constants

Cited by 120 publications

References 467 publications

Effects of phantom microstructure on their optical properties

Effects of phantom microstructure on their optical properties

Two-dimensional electro-optical multiphoton microscopy

A Scalable optical meta-surface glazing design for agricultural greenhouses

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