Nonlinear optical properties of plasma enhanced chemical vapour deposition grown silicon nanocrystals

2002 ◽  
Vol 722 ◽  
Author(s):  
G. Vijaya Prakash ◽  
M. Cazzanelli ◽  
Z. Gaburro ◽  
L. Pavesi ◽  
F. Iacona ◽  
...  
Keyword(s):  
Optical Properties ◽  
Chemical Vapour Deposition ◽  
Silicon Nanocrystals ◽  
Nonlinear Optical ◽  
Vapour Deposition ◽  
Chemical Vapour ◽  
Nonlinear Optical Properties ◽  
Nonlinear Susceptibility ◽  
Closed Aperture ◽  
Third Order

AbstractWe present a systematic study on the nonlinear optical properties of silicon nanocrystals (Si-nc) grown by plasma enhanced chemical vapour deposition (PECVD). The sign and magnitude of both real and imaginary parts of third-order nonlinear susceptibility χ(3) of Si-nc are measured by Z-scan method. While the closed aperture Z-scan reveals a sign of positive nonlinearity, the open aperture measurements suggests a nonlinear absorption coefficients. Absolute values of χ(3) are in the order of 10-9 esu and show systematic correlation with the Si-nc size, due to quantum confinement related effects.

Glass Structures and Linea/Nonlinear Optical Properties of Ag2O-Doped TeO2 Glasses

2014 ◽  
Vol 617 ◽  
pp. 141-144 ◽  
Author(s):  
Yusuke Kasuya ◽  
Toshiki Suhara ◽  
Tomokatsu Hayakawa ◽  
Philippe Thomas ◽  
Masayuki Nogami
Keyword(s):  
Optical Properties ◽  
Absorption Edge ◽  
Photoelectron Spectroscopy ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Nonlinear Susceptibility ◽  
Third Order ◽  
Nonlinear Properties ◽  
Nonlinear Optical Devices ◽  
Third Order Nonlinear Susceptibility

A family of TeO2-based glasses is known to have high third-order nonlinear properties and expected as nonlinear optical devices. In the present study, we fabricated Ag2O-TeO2 and Ag2O-Nb2O5-TeO2 glasses, and estimated their structures and linear/nonlinear optical properties. The main results showed that the absorption-edge of the glasses was shifted to longer wavelength side with increasing Ag2O content. By Raman spectroscopy, it was found that an increase in Ag2O content promoted to change TeO4 to TeO3/TeO3+1 units. X-ray photoelectron spectroscopy (XPS) revealed the presence of an electronic state of Ag2+ ions, which was supposed to have a large influence on the absorption-edge wavelength. In Ag2O-Nb2O5-TeO2 glass system, the third-order nonlinear susceptibility χ(3) increased with increasing Ag2O content at the expense of Nb2O5 content.

scholarly journals Synthesis and investigation of nonlinear optical properties of Para Red: Z-scan technique and quantum mechanical calculations

2018 ◽  
Vol 36 (3) ◽  
pp. 445-451 ◽  
Author(s):  
Fatemeh Mostaghni ◽  
Yasaman Abed
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Nonlinear Susceptibility ◽  
Quantum Mechanical ◽  
Dipole Polarizability ◽  
Quantum Mechanical Calculations ◽  
Quantum Chemical Analysis ◽  
Third Order ◽  
532 Nm

AbstractIn this study, we present a systematic study of linear and nonlinear optical properties of Para Red with the aim of Z-scan technique and quantum mechanical calculations. The Z-scan experiments were performed using a 532 nm Nd: YAG (SHG) CW laser beam. Para Red exhibited a strong nonlinear refractive index, nonlinear absorption coefficient and third-order nonlinear susceptibility 3.487 × 10−6 cm2/W, 2.341 × 10−1cm/W and 2.157 × 10−4 esu, respectively. Also, quantum chemical analysis was used for the calculation of the dipole moment μ, dipole polarizability α, anisotropy of polarizability Δα and molecular hyperpolarizabilities (β,γ). The results revealed that Para Red has large first and second hyperpolarizabilities. However, from the obtained results, it was found that Para Red can be a promising material for applications in the development of non-linear optical materials.

Third-order nonlinear optical properties of three chlorinated thienyl chalcones derivatives: synthesis, structural determination and Hirshfeld surface analysis

2019 ◽  
Vol 234 (10) ◽  
pp. 685-696 ◽  
Author(s):  
Weng Zhun Ng ◽  
Qin Ai Wong ◽  
Tze Shyang Chia ◽  
C. S. Chidan Kumar ◽  
Huey Chong Kwong ◽  
...  
Keyword(s):  
Optical Properties ◽  
Surface Analysis ◽  
Nonlinear Optical ◽  
Continuous Wave ◽  
Hirshfeld Surface ◽  
Nonlinear Optical Properties ◽  
Hirshfeld Surface Analysis ◽  
Nonlinear Susceptibility ◽  
Third Order ◽  
Chalcone Derivatives

Abstract Three chlorinated theinyl chalcone derivatives, namely (E)-1-(5-chlorothiophen-2-yl)-3-(4-(methylthio)phenyl)prop-2-en-1-one (I), (E)-1-(5-chlorothiophen-2-yl)-3-(4-(dimethylamino)phenyl)prop-2-en-1-one (II) and (E)-1-(5-chlorothiophen-2-yl)-3-(2,3-dihydrobenzofuran-5-yl)prop-2-en-1-one (III), were synthesized and their crystal structures were determined by single-crystal X-ray diffraction analysis. Compounds I, II and III crystallize in the monoclinic space groups P 21/c (centrosymmetric), P 21/n (centrosymmetric) and Pc (non-centrosymmetric), respectively. In all three compounds, the molecules are in a relatively planar conformation and adopt a trans configuration with respect to the C=C double bond. The crystal packings are stabilized by weak hydrogen-bonds, π · · · π, C–H · · · π and C–Cl · · · π interactions. The intermolecular contacts and lattice energies were further analyzed by Hirshfeld surface analysis. The third-order nonlinear optical properties of these chalcone derivatives were investigated using the single beam Z-scan technique with a 5 mW continuous wave diode laser operating at 635 nm, where compound I showed the highest potential for optical application with its exclusive nonlinear refractive index and nonlinear susceptibility.

Optical, electrochemical, third-order nonlinear optical, and excited state dynamics studies of thio-zinc phthalocyanine

2014 ◽  
Vol 18 (04) ◽  
pp. 305-315 ◽  
Author(s):  
Debasis Swain ◽  
Varun K. Singh ◽  
Narra V. Krishna ◽  
L. Giribabu ◽  
S. Venugopal Rao
Keyword(s):  
Optical Properties ◽  
Excited State ◽  
Nonlinear Optical ◽  
Radiative Decay ◽  
Nonlinear Optical Properties ◽  
Zinc Phthalocyanine ◽  
Closed Aperture ◽  
Third Order ◽  
Pump Probe ◽  
Excited State Dynamics

Zinc phthalocyanine with S-aryl groups at α-positions have been synthesized and its optical, emission, electrochemical and third-order nonlinear optical properties were investigated. Both the Soret and Q-bands were red-shifted and obeyed Beer–Lambert's law. Electrochemical properties indicated that both oxidation and reduction processes were ring centered. Emission spectra were recorded in different solvents and the fluorescence yields obtained were in the range of 0.02 while time-resolved fluorescence data revealed lifetimes of typically few ns. Excited state dynamics in this novel thio-zinc phthalocyanine molecule has been investigated using femtosecond (fs) degenerate pump-probe spectroscopy. Nonlinear optical properties of this molecule have been examined using the Z-scan technique with picosecond (ps) and fs pulses. Both open and closed aperture Z-scan curves were recorded with ~2 ps/~150 fs laser pulses at a wavelength of 800 nm and nonlinear optical coefficients were extracted from both the studies. Degenerate pump-probe data performed at 600 nm suggested a single long lifetime of ~300 ps, possibly originating from the non-radiative decay of S1 state.

Investigation of third-order nonlinear optical properties of DMIT derivatives by Z-scan technique

2017 ◽  
Vol 26 (02) ◽  
pp. 1750018 ◽  
Author(s):  
Jing-Wei Chen ◽  
Xin-Qiang Wang ◽  
Quan Ren ◽  
Ting-Bin Li ◽  
Hong-Liang Yang
Keyword(s):  
Thin Film ◽  
Thin Films ◽  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Nonlinear Susceptibility ◽  
Saturable Absorption ◽  
Infrared Band ◽  
Third Order ◽  
Focusing Effect

Three 1,3-dithiole-2-thioxo-4,5-dithiolato compounds, ethyltriphenylphosphonium bis(2-thioxo-1.3-dithiole-4,5-dithiolato)aurate(III) (TPEPADT), benzyltriethylamine bis(2-thioxo-1.3-dithiole-4,5-dithiolato)aurate(III) (BTEAADT) and benzyltriethylamine bis(2-thioxo-1.3-dithiole-4,5-dithiolato)nickel(III) (BTEANDT), were synthesized and the BTEAADT-doped PMMA thin film (BD film) and TPEPADT-doped PMMA thin film (TD film) with mass fraction of 1% were prepared by spin-coating method. The third-order nonlinear optical properties of thin films and three compounds in acetonitrile solutions were investigated by using the laser [Formula: see text]-scan technique with 20 ps pulses at 1064 nm. The [Formula: see text]-scan spectra revealed that TPEPADT and BTEAADT exhibited self-defocusing effect and negligible nonlinear absorption, but BTEANDT exhibited self-focusing effect and stronger saturable absorption. The reason for this difference was analyzed. The magnitudes of third-order nonlinear refractive indices and third-order nonlinear susceptibility were [Formula: see text], 10[Formula: see text] esu for the solution samples and [Formula: see text], [Formula: see text] esu for thin films. All these results suggest that these materials are promising candidates for application in the nonlinear optical area at infrared band.

Synthesis, characterization and third order nonlinear optical properties of trans-A2B-tpye cobalt corroles

2021 ◽  
Author(s):  
Guifen Lu ◽  
Peng Zhang ◽  
Yuanyuan Fang ◽  
Yongjie Gao ◽  
Qikang Hu
Keyword(s):  
Optical Properties ◽  
Nonlinear Optical ◽  
Nonlinear Optical Properties ◽  
Para Position ◽  
Third Order

A series of trans-A2B cobalt corroles, represented as [Cor(p-RPh)2(p-NO2Ph)]Co(PPh3) (1-5), where Cor is trianion of corrole, R is a CN, F, CH3, C(CH3)3 or PhCH2O on the para-position of the...

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