Formula for Calculating the Refractive Index of a Thin Transparent Plate from Polarization-State Transmission Measurements

1967 ◽  
Vol 57 (4) ◽  
pp. 544
Author(s):  
D. A. Holmes
Keyword(s):  
Refractive Index ◽  
Polarization State ◽  
Transparent Plate ◽  
Transmission Measurements ◽  
State Transmission

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.

scholarly journals Absorption Coefficient and Refractive Index of GaN, AlN and AlGaN Alloys

1999 ◽  
Vol 4 (S1) ◽  
pp. 502-507 ◽  
Author(s):  
J. F. Muth ◽  
J. D. Brown ◽  
M. A. L. Johnson ◽  
Zhonghai Yu ◽  
R. M. Kolbas ◽  
...  
Keyword(s):  
Refractive Index ◽  
Absorption Coefficient ◽  
Band Gap ◽  
Optoelectronic Devices ◽  
Optical Absorption Coefficient ◽  
Solar Blind ◽  
Single Crystal Films ◽  
Crystal Films ◽  
Transmission Measurements ◽  
Reflectance Measurements

The design of optoelectronic devices fabricated from III-nitride materials is aided by knowledge of the refractive index and absorption coefficient of these materials. The optical properties of GaN, AlN and AlGaN grown by MOVPE on sapphire substrates were investigated by means of transmittance and reflectance measurements. Thin (less than 0.5 μm) single crystal films were employed to insure that transmission measurements could be obtained well above the optical band gap. The influence of alloy broadening on the absorption edge was investigated by using a series of AlGaN alloy samples with a range of Al compositions. The optical absorption coefficient above the band gap was obtained for AlGaN having up to 38% Al composition. The refractive index below the band gap was determined for the same series of samples. These properties provide information critical to the optimal design of solar blind detectors or other optoelectronic devices.

Absorption Coefficient and Refractive Index of GaN, AIN and AlGaN Alloys

1998 ◽  
Vol 537 ◽  
Author(s):  
J. F. Muth ◽  
J. D. Brown ◽  
M. A. L. Johnson ◽  
Zhonghai Yu ◽  
R. M. Kolbas ◽  
...  
Keyword(s):  
Refractive Index ◽  
Absorption Coefficient ◽  
Band Gap ◽  
Optoelectronic Devices ◽  
Optical Absorption Coefficient ◽  
Solar Blind ◽  
Single Crystal Films ◽  
Crystal Films ◽  
Transmission Measurements ◽  
Reflectance Measurements

AbstractThe design of optoelectronic devices fabricated from III-nitride materials is aided by knowledge of the refractive index and absorption coefficient of these materials. The optical properties of GaN, AIN and A1GaN grown by MOVPE on sapphire substrates were investigated by means of transmittance and reflectance measurements. Thin (less than 0.5 μm) single crystal films were employed to insure that transmission measurements could be obtained well above the optical band gap. The influence of alloy broadening on the absorption edge was investigated by using a series of AlGaN alloy samples with a range of Al compositions. The optical absorption coefficient above the band gap was obtained for AIGaN having up to 38% Al composition. The refractive index below the band gap was determined for the same series of samples. These properties provide information critical to the optimal design of solar blind detectors or other optoelectronic devices.

Polarization state-based refractive index sensing with plasmonic nanostructures

Nanoscale ◽  
2015 ◽  
Vol 7 (47) ◽  
pp. 20171-20179 ◽  
Author(s):  
Shao-Ding Liu ◽  
Xin Qi ◽  
Wu-Chao Zhai ◽  
Zhi-Hui Chen ◽  
Wen-Jie Wang ◽  
...  
Keyword(s):  
Refractive Index ◽  
Figure Of Merit ◽  
Polarization State ◽  
Plasmonic Nanostructures ◽  
Refractive Index Sensing

A theoretical value of figure of merit exceeding 1700 is achieved with a polarization state-based refractive index sensing approach.

scholarly journals Measurement of refractive index and thickness of transparent plate by dual-wavelength interference

2010 ◽  
Vol 18 (9) ◽  
pp. 9429 ◽  
Author(s):  
Hee Joo Choi ◽  
Hwan Hong Lim ◽  
Han Seb Moon ◽  
Tae Bong Eom ◽  
Jung Jin Ju ◽  
...  
Keyword(s):  
Refractive Index ◽  
Dual Wavelength ◽  
Transparent Plate

Optical Properties of RF-Sputtered a-SiGe:H:O Alloys

1986 ◽  
Vol 77 ◽  
Author(s):  
J. M. T. Pereira ◽  
P. K. Banerjee ◽  
S. S. Mitra
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Optical Constants ◽  
Rf Sputtering ◽  
Normal Incidence ◽  
Reflection And Transmission ◽  
Amorphous Thin Films ◽  
Optical Gap ◽  
Transmission Measurements ◽  
Substrate Temperatures

ABSTRACTAmorphous thin films of SixGe1-x:O (x = 0.70) were prepared by RF-sputtering at several substrate temperatures. The structural properties of these films were studied by IR spectroscopy and revealed features characteristic of hydrogen and/or oxygen bonded to silicon. The optical constants (n,k) were determined from reflection and transmission measurements at near-normal incidence for photon energies in the range of 1 eV and 2.6 eV. The optical gap was derived from the Taue plot and correlated with the composition of the samples. The increase of hydrogen and/or oxygen decreases the value of the refractive index and increases the optical gap.

Absolute Absorption Intensity and Dispersion Measurements on Some Organic Liquids in the Infrared

1980 ◽  
Vol 34 (6) ◽  
pp. 657-691 ◽  
Author(s):  
T. G. Goplen ◽  
D. G. Cameron ◽  
R. N. Jones
Keyword(s):  
Thin Films ◽  
Refractive Index ◽  
Complex Refractive Index ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Organic Liquids ◽  
Absorption Coefficients ◽  
Absorption Intensity ◽  
Transmission Measurements ◽  
Infrared Absorption Spectra

The infrared absorption spectra and corresponding dispersion spectra of the following liquids have been measured over the range 4200 to 250 cm−1: cyclo-C5H10, CH3·NO2, CH3·CN, CH2Br2, CH2Cl2, CBrCl3, CCl4, C6H6, C6H5·CH3, C6H5Cl, C6H5Br, C6H5I, and C6F6. The spectra were measured in the absence of solvent and the results are reported as the real and imaginary components of the complex refractive index ( n, k). The experimental technique combines transmission measurements through thin films and attenuated total reflection measurements by a method which has been described previously. The complete spectral and dispersion curves are displayed graphically; the absorption maxima are tabulated as absorption indices ( kmax) and as molar absorption coefficients (εmax). The dispersion extrema ( nmin, nmax) are also listed and the experimental uncertainties in these quantities are evaluated. Provision is made to supply the complete optical constant data on magnetic tape at encoded intervals of 0.5 cm−1.

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