AxCe9(IO3)36 (A = K, La): the effects of a change in the intermediate valence on the second-harmonic generation response

2020 ◽  
Vol 49 (12) ◽  
pp. 3672-3675
Author(s):  
Hong-Xin Tang ◽  
Chao Zhuo ◽  
Yu-Xiao Zhang ◽  
Qi-Rui Shui ◽  
Rui-Biao Fu ◽  
...  
Keyword(s):  
Dipole Moment ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Unit Volume ◽  
Second Harmonic ◽  
Visible Region ◽  
Intermediate Valence

A tiny change in the intermediate valence of Ce has little effect on the microscopic net dipole moment per unit volume but it strongly affects the macroscopic SHG response in the visible region, as demonstrated here.

scholarly journals Second harmonic generation correlation spectroscopy for characterizing translationally diffusing protein nanocrystals

2016 ◽  
Vol 72 (7) ◽  
pp. 849-859
Author(s):  
Ximeng Y. Dow ◽  
Christopher M. Dettmar ◽  
Emma L. DeWalt ◽  
Justin A. Newman ◽  
Alexander R. Dow ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Unit Volume ◽  
Second Harmonic ◽  
Incident Beam ◽  
High Sensitivity ◽  
Correlation Spectroscopy ◽  
Optical Process ◽  
Active Nanoparticles ◽  
Low Sensitivity

Second harmonic generation correlation spectroscopy (SHG-CS) is demonstrated as a new approach to protein nanocrystal characterization. A novel line-scanning approach was performed to enable autocorrelation analysis without sample damage from the intense incident beam. An analytical model for autocorrelation was developed, which includes a correction for the optical scattering forces arising when focusing intense, infrared beams. SHG-CS was applied to the analysis of BaTiO3nanoparticles ranging from 200 to ∼500 nm and of photosystem I nanocrystals. A size distribution was recovered for each sample and compared with the size histogram measured by scanning electron microscopy (SEM). Good agreement was observed between the two independent measurements. The intrinsic selectivity of the second-order nonlinear optical process provides SHG-CS with the ability to distinguish well ordered nanocrystals from conglomerates and amorphous aggregates. Combining the recovered distribution of particle diameters with the histogram of measured SHG intensities provides the inherent hyperpolarizability per unit volume of the SHG-active nanoparticles. Simulations suggest that the SHG activity per unit volume is likely to exhibit relatively low sensitivity to the subtle distortions within the lattice that contribute to resolution loss in X-ray diffraction, but high sensitivity to the presence of multi-domain crystals.

scholarly journals Synthesis, Growth and Characterization of New Promising Organic Non-Linear Optical Crystal: L-Alanine Alaninium Nitrate

2019 ◽  
Vol 31 (8) ◽  
pp. 1661-1666
Author(s):  
G. Krishnamoorthi ◽  
R. Uvarani
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Visible Region ◽  
Potassium Dihydrogen Phosphate ◽  
Dihydrogen Phosphate ◽  
Dielectric Study ◽  
Second Harmonic Generation Efficiency ◽  
Cell Parameters ◽  
Induced Defects

A relative study on pure L-alanine alaninium nitrate (LAAN) single crystals and doped with lanthanum oxide, urea and glycine were developed from fluid solution by slow evaporation strategy at room temperature. X-ray diffraction result reveals that LAAN crystallites with system with space bunch P21 and cell parameters a = 7.836 Å, b = 5.428 Å, c = 12.809 Å and β = 94.25°. These parameters were marginally changes for doped crystals compared to pure LAAN crystal. The UV results recommend that the great transmission property of the doped LAAN crystal within the whole visible region guarantees its reasonableness for second harmonic generation applications. The presence of dopants within the LAAN crystal was further affirmed through ICP studies. The functional groups were analyzed through Fourier change infrared spectra investigation. The microhardness and dielectric study at 100 Hz was found to be broadly higher than that of pristine LAAN. The AC conductivity was found to extend after doping due to the induced defects in crystal lattice. The grown crystals were also subjected to second harmonic generation efficiency tests and it was found to be La2O3 doped LAAN crystal is 2.8 times greater than that of potassium dihydrogen phosphate (KDP).

Second-Harmonic Generation in Thermally Poled Na2O-Al2O3-TeO2 Glasses

2008 ◽  
Vol 39-40 ◽  
pp. 247-252 ◽  
Author(s):  
Sakiko Ukon ◽  
Yasuhito Tsujiie ◽  
Shunsuke Murai ◽  
Koji Fujita ◽  
Katsuhisa Tanaka
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Visible Region ◽  
High Refractive Index ◽  
Nonlinear Susceptibility ◽  
Tellurite Glasses ◽  
Oxide Glasses ◽  
Sodium Tellurite ◽  
Thermally Poled

Tellurite glasses exhibit attractive optical properties such as high refractive index, high transmittance in the infrared-to-visible region, and large third-order nonlinear susceptibility. Poled tellurite glasses also show second-harmonic generation (SHG) as revealed by the present authors. However, there exist many unresolved problems in second-harmonic generation of oxide glasses; SH intensity is low and it decays at room temperature. In this work, the effect of Al2O3 addition on SH intensity and its decay has been explored for thermally poled sodium tellurite glasses. The decay rate of SH intensity is reduced by the addition of Al2O3. The result is similar to those reported for phosphate and silicate glasses containing Al2O3. Also, the glasses poled at a voltage of 4 kV manifest optimum poling temperature lower than that for the same glasses poled at 3 kV.

Molecular Design of Synthetic Polypeptides for Nonlinear Optics

1989 ◽  
Vol 175 ◽  
Author(s):  
T. Ishii ◽  
T. Wada ◽  
A. F. Garito ◽  
H. Sasabe ◽  
A. Yamada
Keyword(s):  
Dipole Moment ◽  
Nonlinear Optics ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Main Chain ◽  
Molecular Design ◽  
Second Harmonic ◽  
Permanent Dipole Moment ◽  
Carbonyl Groups ◽  
Synthetic Polypeptides

AbstractSecond order molecular susceptibilities β of poly(γ – benzyl L–glutamate)(PBLG) and poly(γ – p–nitrobenzyl L–glutamate) (PNBLG) were determined by means of dc-induced second harmonic generation (dc-SHG technique in solutions at a wavelength of 1064nm as 1.5×10–−29 esu and −4.9×10−29 esu, respectively. Among PBLG, PNBLG and nitrobenzene, it was found that only PNBLG has negative value of β. It follows that the effect of nitrophenyl groups in side chains is dominant for β whereas the contribution of carbonyl groups in main chain is dominant for the permanent dipole moment μ in PNBLG.

Spectroscopic Study on the Visible Region of the Second Harmonic Generation in LiNbO3 nanocrystals

2015 ◽  
Author(s):  
O. Sánchez-Dena ◽  
E. V. García-Ramírez ◽  
E. Vigueras-Santiago ◽  
C. D. Fierro-Ruiz ◽  
Rurik Farías ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Spectroscopic Study ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Visible Region

scholarly journals New Solids in As-O-Mo, As(P)-O-Mo(W) and As(P)-O-Nb(W) Systems That Exhibit Nonlinear Optical Properties

Molecules ◽  
2021 ◽  
Vol 26 (5) ◽  
pp. 1494
Author(s):  
Nikolay Gerasimchuk ◽  
Lauri Kivijarvi ◽  
Bruce Noll ◽  
Meriem Goudjil ◽  
Soma Khanra ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Second Harmonic Generation ◽  
Single Crystals ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Mixed Valence ◽  
Visible Region ◽  
Space Groups ◽  
Air Atmosphere ◽  
Practical Usefulness

Interactions between well-mixed fine powders of As2O3, P2O5, MoO3, WO3 and Nb2O5 at different stoichiometry in quartz ampoules under vacuum at ~1000 °C in the presence of metallic molybdenum (or niobium), over several weeks, led to shiny dichroic crystalline materials being formed in cooler parts of the reaction vessel. An addition of small quantities of metals-Mo or Nb-was made with the aim of partially reducing their highly oxidized Mo(VI), W(VI) or Nb(V) species to corresponding Mo(V), W(V) and Nb(IV) centers, in order to form mixed valence solids. Sublimed crystals of four new compounds were investigated using a variety of techniques, with prime emphasis on the X-ray analysis, followed by spectroscopy (diffusion reflectance, IR, Raman and EPR), second harmonic generation (SHG), thermal analysis under N2 and air atmosphere, and single crystals electrical conductivity studies. The results evidenced the formation of new complex solids of previously unknown compositions and structures. Three out of four compounds crystallized in non-centrosymmetric space groups and represent layered 2D polymeric puckered structures that being stacked on each other form 3D lattices. All new solids exhibit strong second-harmonic-generation (SHG effect; based on YAG 1064 nm tests with detection of 532 nm photons), and a rare photosalient effect when crystals physically move in the laser beam. Single crystals’ electrical conductivity of the four new synthesized compounds was measured, and the results showed their semiconductor behavior. Values of band gaps of these new solids were determined using diffusion reflectance spectroscopy in the visible region. Aspects of new solids’ practical usefulness are discussed.

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