Large Nonlinear Refractive Indices of Nickel Dithiolene Doped Polymethylmethacrylate

1992 ◽  
Vol 247 ◽  
Author(s):  
Christopher S. Winter ◽  
S. N. Oliver ◽  
C A. S. Hill
Keyword(s):  
Refractive Index ◽  
Nonlinear Absorption ◽  
Nonlinear Refractive Index ◽  
Refractive Indices ◽  
Absorption Coefficients ◽  
Figures Of Merit ◽  
Linear And Nonlinear

ABSTRACTThe nonlinear refractive index, linear and nonlinear absorption coefficients of a number of nickel dithiolene-doped PMMA polymers have been measured. Nonlinear refractive indices up to about 10−8 cm−2/KW were observed, with figures of merit defined by δnsat/αλ and Reχ(3) / Im χ(3) within acceptable device limits.

Linear and nonlinear refractive index changes in monolayer MoSe2

2021 ◽  
Vol 10 (5) ◽  
pp. 25-30
Author(s):  
Bich Tran Ngoc ◽  
Hieu Nguyen Ngoc ◽  
Tho Ta Thi ◽  
Tu Le Thi Ngoc ◽  
Phuc Huynh Vinh
Keyword(s):  
Refractive Index ◽  
Nonlinear Refractive Index ◽  
Index Changes ◽  
Linear And Nonlinear

NON-LINEAR REFRACTIVE INDEX MEASUREMENT OF (2E)-3-[4-(DIMETHYLAMINO)PHENYL]-1-(2,5-DIMETHYLTHIOPHEN-3-YL)PROP-2-EN-1-ONE AND (2E)-3-(3,4-DIMETHOXYPHENYL)-1-(2,5-DIMETHYLTHIOPHEN-3-YL)PROP-2-EN-1-ONE

2011 ◽  
Vol 20 (02) ◽  
pp. 183-191 ◽  
Author(s):  
FRYAD Z. HENARI ◽  
ABDULLAH M. ASIRI
Keyword(s):  
Refractive Index ◽  
Absorption Coefficient ◽  
Nonlinear Absorption ◽  
Nonlinear Refractive Index ◽  
Continuous Wave ◽  
Nonlinear Effects ◽  
Optical Limiting ◽  
Nonlinear Absorption Coefficient ◽  
Refractive Index Measurement ◽  
Index Measurement

We report results from investigations of the nonlinear refractive index and nonlinear absorption coefficient of (2E)-3-[4-(Dimethylamino)phenyl]-1-(2,5-dimethylthiophen-3-yl)prop-2-en-1-one and (2E)-3-(3,4-Dimethoxyphenyl)-1-(2,5-dimethylthiophen-3-yl) prop-2-en-1-one using Z-scan technique with a continuous wave (cw) laser at wavelengths 488 nm and 514 nm. The nonlinear refractive index and nonlinear absorption coefficient of both samples were evaluated. The origin of the nonlinear effects was discussed. Optical limiting based on light induced nonlinear refractive index variation is demonstrated. The limiting thresholds were estimated for both samples. The results suggested that these materials offer promise as candidates for optical limiting and optical devices in the low power regime.

scholarly journals MEASUREMENT OF NONLINEAR RESPONSES AND OPTICAL LIMITING BEHAVIOR OF TIO2/PS NANO-COMPOSITE BY SINGLE BEAM TECHNIQUE WITH DIFFERENT INCIDENT INTENSITIES

2012 ◽  
Vol 05 ◽  
pp. 277-283 ◽  
Author(s):  
M. H. MAJLES ARA ◽  
Z. DEHGHANI
Keyword(s):  
Refractive Index ◽  
Absorption Coefficient ◽  
Nonlinear Absorption ◽  
Nonlinear Refractive Index ◽  
Optical Limiting ◽  
Nonlinear Absorption Coefficient ◽  
Third Order ◽  
Nano Composite ◽  
Single Beam ◽  
The Third

Titanium dioxide (titania) is a cheap, nontoxic and highly efficient photocatalyst being extensively applied for the degradation of organic pollutants, air purification, water splitting, reduction of nitrogen to ammonia, and optical devices due to its optical behaviors. The third-order nonlinear optical properties of TiO 2/ PS nano-composite were studied by means of single beam transmission technique, using a continuous-wave (CW) He - Ne laser beam with a wavelength of 632.8 nm with three different incident intensities. The magnitude and sign of the third-order nonlinear refractive index ( n 2) and nonlinear absorption (β) of TiO 2/ PS nano-composite were determined by use of both the closed-aperture and opened-aperture z -scan techniques. Z -scan technique, developed by Sheik-Bahae et al., has been used widely in material characterization. A single-beam (also called z -scan method) for measuring the sign and magnitude of nonlinear refraction that has simplicity and very high sensitivity has been reported recently. Optical limiting property of TiO 2/ PS nano-composite is studied. The positive sign obtained for nonlinear refractive index indicated that there is a self-focusing effect in the sample. The nonlinear refractive index was in order of 10-8 (cm2/W) and the nonlinear absorption coefficient was obtained in order of 10-2 (cm/W) with negative sign. The values of nonlinear refractive index and nonlinear absorption coefficient are enhanced by decreasing the intensity.

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