Self-induced Changes in the Refractive Index in CdS at λ = 532 nm

1987 ◽  
pp. 357-361 ◽  
Author(s):  
P. M. Petersen
Keyword(s):  
Refractive Index ◽  
Induced Changes ◽  
532 Nm

Investigation of the third-order nonlinear optical properties in porphyrin solutions in the picosecond regime

2015 ◽  
Vol 24 (03) ◽  
pp. 1550030 ◽  
Author(s):  
M. Chniti ◽  
C. Cassagne ◽  
J. L. Godet ◽  
G. Boudebs
Keyword(s):  
Refractive Index ◽  
Optical Properties ◽  
Time Dependence ◽  
Nonlinear Optical ◽  
Optical Response ◽  
Spectral Width ◽  
Incident Laser ◽  
Third Order ◽  
The Third ◽  
532 Nm

The D4σ-Z-scan technique is used to evaluate the sign and the magnitude of the nonlinear (NL) refractive index and the NL absorption (NLA) coefficient with a laser delivering single pulses in the picosecond regime at 355 nm, 532 nm and 1064 nm. The NL optical response of the zinc porphyrins (Pph) has been found to be significantly enhanced. The study of the NLA and refraction is performed, taking into account the time dependence and the spectral width of the incident laser. The variations of the NL coefficients as a function of the intensity and the concentration are provided and are found to be linear.

Measurement of carrier-induced changes of the complex refractive index in InGaAsP near the band edge

1995 ◽  
Vol 120 (3-4) ◽  
pp. 158-165
Author(s):  
Osamu Hanaizumi ◽  
Manabu Izumikawa ◽  
Shojiro Kawakami
Keyword(s):  
Refractive Index ◽  
Complex Refractive Index ◽  
Band Edge ◽  
Induced Changes

scholarly journals Formation of Direct Surface Relief in Photochrome-Chalcogenide Composites

2010 ◽  
Vol 47 (2) ◽  
pp. 49-59
Author(s):  
A. Gerbreders ◽  
J. Teteris
Keyword(s):  
Surface Relief ◽  
Composite Films ◽  
Film Surface ◽  
Organic Polymer ◽  
Holographic Recording ◽  
Relief Formation ◽  
Induced Changes ◽  
Quartz Substrates ◽  
532 Nm ◽  
Transmission And Reflection

Formation of Direct Surface Relief in Photochrome-Chalcogenide CompositesA method for preparation of thin triple composite films of organic polymer-chalcogenide-photochromes is described, the photo-induced changes of optical properties and holographic recording are considered. The films were obtained from solutions of arsenic sulphide, azobenzene Disperse Red 1, spiropyran, and organic polymers in organic solvents. The solutions were spread over glass or quartz substrates; the thickness of dry films was 3-10 μm. The absorption spectra of the prepared films were studied and analyzed. The holographic recording of diffraction gratings was performed by laser lines of 325 nm, 442 nm and 532 nm. During recording the diffraction efficiency was measured simultaneously in the transmission and reflection modes. The relief formation on the film surface was observed and the profile of the gratings formed was analyzed using AFM microscope. The influence of photoisomerization and photo-induced mass transport on the surface relief formation process is discussed.

Electron beam induced changes in the refractive index and film thickness of amorphous AsxS100−x and AsxSe100−x films

1998 ◽  
Vol 84 (11) ◽  
pp. 6055-6058 ◽  
Author(s):  
Olli Nordman ◽  
Nina Nordman ◽  
Nasser Peyghambarian
Keyword(s):  
Refractive Index ◽  
Electron Beam ◽  
Film Thickness ◽  
Induced Changes

scholarly journals Refractive index distribution in the porcine eye lens for 532 nm and 633 nm light

Eye ◽  
2004 ◽  
Vol 19 (4) ◽  
pp. 375-381 ◽  
Author(s):  
B K Pierscionek ◽  
A Belaidi ◽  
H H Bruun
Keyword(s):  
Refractive Index ◽  
Eye Lens ◽  
Refractive Index Distribution ◽  
Index Distribution ◽  
532 Nm

scholarly journals 3D Laser Nanoprinting of Optically Functionalized Structures with Effective-Refractive-Index Tailorable TiO2 Nanoparticle-Doped Photoresin

Nanomaterials ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 55
Author(s):  
Shichao Song ◽  
Yijie Li ◽  
Zhuofan Yao ◽  
Jie Li ◽  
Xiangping Li ◽  
...  
Keyword(s):  
Refractive Index ◽  
Titanium Dioxide ◽  
Effective Refractive Index ◽  
Titanium Dioxide Nanoparticles ◽  
Dark Field ◽  
Tio2 Nanoparticle ◽  
Direct Laser ◽  
The Matrix ◽  
Acrylate Resin ◽  
532 Nm

The advanced direct laser printing of functional devices with tunable effective index is a key research topic in numerous emerging fields, especially in micro-/nano-optics, nanophotonics, and electronics. Photosensitized nanocomposites, consisting of high-index materials (e.g., titanium dioxide, TiO2) embedded in polymer matrix, are emerging as attractive platforms for advanced additive manufacturing. Unfortunately, in the currently applied techniques, the preparation of optically functionalized structures based on these photosensitized nanocomposites is still hampered by many issues like hydrolysis reaction, high-temperature calcinations, and, especially, the complexity of experimental procedures. In this study, we demonstrate a feasible strategy for fabricating micro-/nanostructures with a flexibly manipulated effective refractive index by incorporating TiO2 nanoparticles in the matrix of acrylate resin, i.e., TiO2-based photosensitized nanocomposites. It was found that the effective refractive index of nanocomposite can be easily tuned by altering the concentration of titanium dioxide nanoparticles in the monomer matrix. For TiO2 nanoparticle concentrations up to 30 wt%, the refractive index can be increased over 11.3% (i.e., altering from 1.50 of pure monomer to 1.67 at 532 nm). Based on such a photosensitized nanocomposite, the grating structures defined by femtosecond laser nanoprinting can offer vivid colors, ranging from crimson to magenta, as observed in the dark-field images. The minimum printing width and printing resolution are estimated at around 70 nm and 225 nm, indicating that the proposed strategy may pave the way for the production of versatile, scalable, and functionalized opto-devices with controllable refractive indices.

A test of the role of refractive index in correlations between solvent effects on electronic spectra and solvent effects on reaction equilibria and rates

1984 ◽  
Vol 49 (10) ◽  
pp. 2332-2341 ◽  
Author(s):  
Vojtěch Bekárek
Keyword(s):  
Refractive Index ◽  
Solvent Effects ◽  
Electronic Spectra ◽  
Kinetic Data ◽  
Fluorescence Spectra ◽  
Simple Relation ◽  
Absorption And Fluorescence Spectra ◽  
Induced Changes ◽  
Better Than

80 correlations have been carried out between the medium-induced changes in equilibrium and kinetic data (Y) and the medium-induced changes in positions of maxima in electronic (both absorption and fluorescence) spectra (Δν) of the Kamlet-Taft type indicators. The correlations have been carried out by means of the equations Y=Y0 + k . Δν and Y=Y0 + k' . Δν/f(n2) using only the Kamlet-Taft select solvents (SSS). The equation involving the function of refreactive index (n), f(n2) = (n2 - 1)/(2n2 + 1), is better than the simple relation between Y and Δν in 93% of the systems studied. The problem of HBD acidity of nitromethane and the relation of the A and B solvent characteristics by Swain and the characteristics of dipolarity of medium by Kamlet-Taft are discussed.

scholarly journals Variability in lidar-derived particle properties over West Africa due to changes in absorption: towards an understanding

2020 ◽  
Vol 20 (11) ◽  
pp. 6563-6581 ◽  
Author(s):  
Igor Veselovskii ◽  
Qiaoyun Hu ◽  
Philippe Goloub ◽  
Thierry Podvin ◽  
Mikhail Korenskiy ◽  
...  
Keyword(s):  
Refractive Index ◽  
Imaginary Part ◽  
Complex Refractive Index ◽  
Second Phase ◽  
Height Range ◽  
Good Opportunity ◽  
Western Africa ◽  
Particle Parameters ◽  
Lidar Ratio ◽  
532 Nm

Abstract. Measurements performed in western Africa (Senegal) during the SHADOW field campaign are analyzed to show that spectral dependence of the imaginary part of the complex refractive index (CRI) of dust can be revealed by lidar-measured particle parameters. Observations in April 2015 provide good opportunity for such study, because, due to high optical depth of the dust, exceeding 0.5, the extinction coefficient could be derived from lidar measurements with high accuracy and the contribution of other aerosol types, such as biomass burning, was negligible. For instance, in the second half of April 2015, AERONET observations demonstrated a temporal decrease in the imaginary part of the CRI at 440 nm from approximately 0.0045 to 0.0025. This decrease is in line with a change in the relationship between the lidar ratios (the extinction-to-backscattering ratio) at 355 and 532 nm (S355 and S532). For instance in the first half of April, S355∕S532 is as high as 1.5 and the backscatter Ångström exponent, Aβ, is as low as −0.75, while after 15 April S355/S532=1.0 and Aβ is close to zero. The aerosol depolarization ratio δ532 for the whole of April exceeded 30 % in the height range considered, implying that no other aerosol, except dust, occurred. The performed modeling confirmed that the observed S355∕S532 and Aβ values match the spectrally dependent imaginary part of the refractive index as can be expected for mineral dust containing iron oxides. The second phase of the SHADOW campaign was focused on evaluation of the lidar ratio of smoke and estimates of its dependence on relative humidity (RH). For five studied smoke episodes the lidar ratio increases from 44±5 to 66±7 sr at 532 nm and from 62±6 to 80±8 sr at 355 nm, when RH varied from 25 % to 85 %. Performed numerical simulations demonstrate that observed ratio S355∕S532, exceeding 1.0 in the smoke plumes, can indicate an increase in the imaginary part of the smoke particles in the ultraviolet (UV) range.

MICROFIBER STRUCTURES FOR SENSOR APPLICATIONS

2012 ◽  
Vol 21 (01) ◽  
pp. 1250003 ◽  
Author(s):  
S. W. HARUN ◽  
K. S. LIM ◽  
H. AHMAD
Keyword(s):  
Refractive Index ◽  
Electric Current ◽  
Copper Wire ◽  
Extinction Ratio ◽  
Resonant Wavelength ◽  
Wavelength Shift ◽  
Thermally Induced ◽  
Sensor Applications ◽  
Induced Changes ◽  
Ratio Reduction

Microfiber loop resonator (MLR) and microfiber knot resonator (MKR) are fabricated using melt-stretching method for applications in temperature and current sensor, respectively. The MLR is embedded into low refractive index polymer for robustness. Although the spacing of the transmission comb spectrum of the MLR is unchanged with temperature, the extinction ratio of the spectrum is observed to decrease linearly with temperature due to induced changes in the material's refractive index. The slope of the extinction ratio reduction against temperature is about 0.043dB/°C. With the assistance of a copper wire that is wrapped by the MKR, resonant wavelength can be tuned by varying the electric current delivered to the wire. The resonant wavelength change is based on the thermally induced optical phase shift in the MKR due to the heat produced by the flow of electric current over a short transit length. It is shown that the wavelength shift is linearly proportional to the square of current in the copper wire with a tuning slope of 46 pm/A2.

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