Poling-induced crystallization of tetragonal BaTiO3 and enhancement of optical second-harmonic intensity in BaO–TiO2–TeO2 glass system

1999 ◽  
Vol 75 (21) ◽  
pp. 3399-3401 ◽  
Author(s):  
Aiko Narazaki ◽  
Katsuhisa Tanaka ◽  
Kazuyuki Hirao
Keyword(s):  
Second Harmonic ◽  
Glass System ◽  
Harmonic Intensity ◽  
Induced Crystallization

scholarly journals Pushing and Pulling on OH-and H3O+ with Electric Fields Across Water’s Surface

2021 ◽  
Author(s):  
kamal ray ◽  
Aditya Limaye ◽  
Ankur Saha ◽  
Ka Chon Ng ◽  
Adam Willard ◽  
...  
Keyword(s):  
Electric Fields ◽  
Second Harmonic ◽  
Ionic Species ◽  
Dynamics Simulation ◽  
Dipole Orientation ◽  
Harmonic Intensity ◽  
Air Interface ◽  
Excess Surface ◽  
Internal Bias ◽  
Pushing And Pulling

<p>We use second harmonic generation spectroscopy, molecular dynamics simulation, and theoretical modeling to study the response of the neat liquid water-air interface to changes in the potential of an external electrode positioned above the liquid. We observe a parabolic dependence of second harmonic intensity on applied potential, indicating that water’s net interfacial dipole responds linearly. We also observe a minimum intensity when the potential is tuned to a specific positive value. Interpreting this minimum based on the macroscopic electrostatic potential profile yields misleading physical conclusions because it neglects the internal bias exerted on molecular orientations by the excess surface concentrations of OH<sup>-</sup> or H<sub>3</sub>O<sup>+</sup>. We thus find that water’s net interfacial dipole orientation is primarily responsive to the effects of these ionic species rather than the external electric field. </p>

scholarly journals Pushing and Pulling on OH-and H3O+ with Electric Fields Across Water’s Surface

2021 ◽  
Author(s):  
kamal ray ◽  
Aditya Limaye ◽  
Ankur Saha ◽  
Ka Chon Ng ◽  
Adam Willard ◽  
...  
Keyword(s):  
Electric Fields ◽  
Second Harmonic ◽  
Ionic Species ◽  
Dynamics Simulation ◽  
Dipole Orientation ◽  
Harmonic Intensity ◽  
Air Interface ◽  
Excess Surface ◽  
Internal Bias ◽  
Pushing And Pulling

<p>We use second harmonic generation spectroscopy, molecular dynamics simulation, and theoretical modeling to study the response of the neat liquid water-air interface to changes in the potential of an external electrode positioned above the liquid. We observe a parabolic dependence of second harmonic intensity on applied potential, indicating that water’s net interfacial dipole responds linearly. We also observe a minimum intensity when the potential is tuned to a specific positive value. Interpreting this minimum based on the macroscopic electrostatic potential profile yields misleading physical conclusions because it neglects the internal bias exerted on molecular orientations by the excess surface concentrations of OH<sup>-</sup> or H<sub>3</sub>O<sup>+</sup>. We thus find that water’s net interfacial dipole orientation is primarily responsive to the effects of these ionic species rather than the external electric field. </p>

scholarly journals Second Harmonic Generation from Thermally Poled Ge-S Glass System

2005 ◽  
Vol 113 (1323) ◽  
pp. 728-732 ◽  
Author(s):  
Yukari NAKANE ◽  
Hiroyuki NASU ◽  
Jong HEO ◽  
Tadanori HASHIMOTO ◽  
Kanichi KAMIYA
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Glass System ◽  
Thermally Poled

scholarly journals Space-Selective Control of Functional Crystals by Femtosecond Laser: A Comparison between SrO-TiO2-SiO2 and Li2O-Nb2O5-SiO2 Glasses

Crystals ◽  
2020 ◽  
Vol 10 (11) ◽  
pp. 979
Author(s):  
Xuan He ◽  
Qiming Liu ◽  
Matthieu Lancry ◽  
François Brisset ◽  
Bertrand Poumellec
Keyword(s):  
Femtosecond Laser ◽  
Second Harmonic ◽  
Scanning Speed ◽  
High Energy ◽  
Femtosecond Laser Irradiation ◽  
Laser Polarization ◽  
Electron Backscattered Diffraction ◽  
Sio2 Glass ◽  
Significant Difference ◽  
Induced Crystallization

We report on space-selective crystallization of congruent and polar Sr2TiSi2O8 crystals in a stoichiometric SrO-TiO2-SiO2 glass induced by (1030 nm, 300 fs) femtosecond laser irradiation. This allows us to compare with non-congruent laser-induced crystallization of polar LiNbO3 in non-stoichiometric Li2O-Nb2O5-SiO2 glass and gain information on the mechanism of nanocrystals orientation with the laser polarization that we pointed out previously. Using scanning electron microscopy (SEM), second harmonic generation (SHG), and electron backscattered diffraction (EBSD), we studied the laser-induced crystallization according to the laser processing parameters (pulse energy, pulse repetition rate, scanning speed). We found (1) a domain where the laser track is filled with crystals not perfectly textured (low energy), (2) a domain where an amorphous volume remains surrounded by a crystallized shell (high energy). This arises from Sr out-diffusion and may give rise to the crystallization of both SrTiO3 and Sr2TiSi2O8 phases at low speed. In the one-phase domain (at higher speed), the possibility to elaborate a tube with a perfect Fresnoite texture is found. A significant difference in size and morphology whereas the crystallization threshold remains similar is discussed based on glass thermal properties. Contrarily to Li2O-Nb2O5-SiO2 (LNS) glass, no domain of oriented nanocrystallization controlled by the laser polarization has been found in SrO-TiO2-SiO2 (STS) glass, which is attributed to the larger crystallization speed in STS glass. No nanogratings have also been found that is likely due to the congruency of the glass.

Pyroelectric and second harmonic responses from LiTaO3 nanocrystallites evolved in a Li2O–B2O3–Ta2O5 glass system

CrystEngComm ◽  
2015 ◽  
Vol 17 (11) ◽  
pp. 2327-2335 ◽  
Author(s):  
P. W. Jaschin ◽  
K. B. R. Varma
Keyword(s):  
Heat Treatment ◽  
Dendritic Growth ◽  
Second Harmonic ◽  
Glass System ◽  
System P

Dendritic growth of trigonal and square bipyramidal structures of LiTaO3 nanocrystallites, of 19–30 nm size, was observed when 1.5Li2O–2B2O3–0.5Ta2O5 glasses were subjected to controlled heat treatment between 530 °C and 560 °C/3 h.

Second Order Nonlinear Optical Thin Films Fabricated from Electric Field-Assisted Electrostatic Self-Assembled Monolayer Method

1999 ◽  
Vol 561 ◽  
Author(s):  
Y. Liu ◽  
R.O. Claus ◽  
D. Marciu ◽  
C. Figura ◽  
J.R. Heflin
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
New Method ◽  
Multilayer Thin Films ◽  
Self Assembled Monolayer ◽  
Harmonic Intensity ◽  
Self Assembled ◽  
First Time

ABSTRACTA new method for the build-up of non-centrosymmetric multilayer thin films has been developed for the first time using an electric field-assisted electrostatic self-assembled monolayer (EF-ESAM) technique. An increase by 116% of the second-harmonic intensity of the films has been observed in comparison with that of ESAM film.

Article

1998 ◽  
Vol 76 (11) ◽  
pp. 1616-1632
Author(s):  
Bozena Borecka-Bednarz ◽  
Alan V Bree ◽  
Brian O Patrick ◽  
John R Scheffer ◽  
James Trotter
Keyword(s):  
Solid State ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Crystallographic Analysis ◽  
Organic Salts ◽  
Harmonic Intensity ◽  
Space Groups ◽  
Order Of Magnitude ◽  
Optically Pure

Second-harmonic generation in the solid state is restricted to materials that crystallize in non-centrosymmetric space groups. Unfortunately, the vast majority of solids crystallize in centrosymmetric space groups and are therefore SHG-inactive. The requirement for solid-state asymmetry is addressed in a new series of organic salts. The acid p-nitrophenylglycine, SHG-inactive due to its centrosymmetric (P1) packing, was coupled to six optically pure amines to form salts and (or) complexes that, by virtue of their chiral counterion, crystallized in non-centrosymmetric space groups. The 1064 nm output from a Nd:YAG laser produced 532 nm second-harmonic generation from each of the six salts, with three of the salts producing second-harmonic intensities at least an order of magnitude greater than that of our standard, urea. X-ray crystallographic analysis was carried out on five of the six salts, and an attempt was made to rationalize the second-harmonic intensity of each of these five salts based on the orientation of its molecular charge-transfer axis in the unit cell and on its chromophore density.Key words: second-harmonic generation, nonlinear optics, chiral organic salts, crystal structures.

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