scholarly journals Polarity-dependent nonlinear optics of nanowires under electric field

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Regev Ben-Zvi ◽  
Omri Bar-Elli ◽  
Dan Oron ◽  
Ernesto Joselevich
Keyword(s):  
Electric Field ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Photovoltaic Effect ◽  
Polar Axis ◽  
Analytical Tool ◽  
Related Property ◽  
Polar Crystal ◽  
Polar Materials ◽  
The Absolute

AbstractPolar materials display a series of interesting and widely exploited properties owing to the inherent coupling between their fixed electric dipole and any action that involves a change in their charge distribution. Among these properties are piezoelectricity, ferroelectricity, pyroelectricity, and the bulk photovoltaic effect. Here we report the observation of a related property in this series, where an external electric field applied parallel or anti-parallel to the polar axis of a crystal leads to an increase or decrease in its second-order nonlinear optical response, respectively. This property of electric-field-modulated second-harmonic generation (EFM-SHG) is observed here in nanowires of the polar crystal ZnO, and is exploited as an analytical tool to directly determine by optical means the absolute direction of their polarity, which in turn provides important information about their epitaxy and growth mechanism. EFM-SHG may be observed in any type of polar nanostructures and used to map the absolute polarity of materials at the nanoscale.

PRELIMINARY OPTICAL STUDY ON ER FLUIDS

1994 ◽  
Vol 08 (20n21) ◽  
pp. 2921-2933 ◽  
Author(s):  
L. W. ZHOU ◽  
J. F. YE ◽  
R. B. TAO ◽  
Y. TANG ◽  
J. F. PENG ◽  
...  
Keyword(s):  
Phase Transition ◽  
Electric Field ◽  
Electric Fields ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Optical Response ◽  
Optical Study ◽  
Solid States ◽  
Linear And Nonlinear ◽  
Er Fluids

Linear and nonlinear optical study on electrorheological (ER) fluids is reported. The ER fluids under the investigation were glass beads, zeolite and ferroelectrics. The linear optical response of some ER fluids showed sharp changes near critical electric fields. An enhancement of electric field induced second harmonic generations (EFISH) was observed as the function of E2, where E is the external electric field. The said enhancement is considered to be corresponding to a modulation of the material's refractive index associated with the electric field induced polarization of the delocalized electrons. The enhanced nonlinear optical response on the transition between liquid and solid states can be related to the phase transition in ER fluids.

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.

Effect of Electric Field on Nonlinear Optical Properties of Hydrazone Doped PMMA Films

2012 ◽  
Vol 584 ◽  
pp. 88-91
Author(s):  
N.K. Siji Narendran ◽  
K.R. Reshma ◽  
P. Sudheesh ◽  
K. Chandrasekharan
Keyword(s):  
Optical Properties ◽  
Electric Field ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Laser Pulses ◽  
Nonlinear Optical Properties ◽  
Third Order ◽  
Single Beam ◽  
Solution Casting Method ◽  
Order Susceptibility

We report the effect of electric field on third order nonlinear optical properties of Hydrazone (Hz) doped Polymethyl methacrylate (PMMA) films. The films were prepared by solution casting method. Poling of films was done by corona discharge. Single beam Z-scan technique with 7ns Nd: YAG laser pulses at 532nm were employed for the measurements. Third order susceptibility of films was measured with an emphasis on the applied electric field. We also demonstrated the second harmonic generation in the corona poled films.

Analyzing Open-Voltage of Double-Layer Organic Solar Cells Using Optical Electric-Field-Induced Second-Harmonic Generation

2012 ◽  
Vol 1390 ◽  
Author(s):  
Dai Taguchi ◽  
Xiangyu Chen ◽  
Takaaki Manaka ◽  
Mitsumasa Iwamoto
Keyword(s):  
Solar Cells ◽  
Electric Field ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Organic Solar Cells ◽  
Second Harmonic ◽  
Photovoltaic Effect ◽  
Short Circuit ◽  
Open Circuit ◽  
Electrostatic Energy

ABSTRACTBy using electric-field-induced second-harmonic generation (EFISHG) measurement, we analyzed photovoltaic effect of two-layer solar cells (indium zinc oxide/pentacene/C60/Al). Results evidently showed that negative and excessive charges Qs accumulated at the two-layer interface under illumination, e.g., Qs =-1.7×10-9 C/cm2 at 0.05 mW/cm2 and –3.6×10-9 C/cm2 at 0.5 mW/cm2, while a short-circuit current flowed. The open-circuit voltage changed in accordance with accumulation charge Qs, and finally saturated. Modeling that accumulated negative charge is a source of space charge field and directly effects on the electrostatic energy stored in OSCs, dependence of the open voltage on the accumulated charge Qs was explained.

Second-Harmonic and Sum-Freqency Generation in CdGeAs2

1997 ◽  
Vol 484 ◽  
Author(s):  
Eiko Tanaka ◽  
Kiyoshi Kato
Keyword(s):  
Optical Constant ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Absolute Value ◽  
Dispersion Formula ◽  
The Absolute

AbstractCdGeAs2 has been found to be phase-matchable for type-2 SHG down to 2.833 μ m and type-2(b) SFG between the fundamental and second harmonic of a CO2 laser down to 10.4406 μ m at 20.0°C. The Sellmeier's equations and the thermo-optic dispersion formula which reproduce well the phasematching properties of SHG and direct FHG of the CO2 lasers at 77K are presented together with the absolute value of the nonlinear optical constant.

scholarly journals Significant second-harmonic generation and bulk photovoltaic effect in trigonal selenium and tellurium chains

2021 ◽  
Author(s):  
Mei-Juan Cheng ◽  
Xiao-Hong Shi ◽  
Shunqing Wu ◽  
Zizhong Zhu
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
First Principles ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Photovoltaic Effect ◽  
First Principles Calculations ◽  
Nlo Properties ◽  
One Dimensional ◽  
Linear And Nonlinear

One-dimensional (1D) selenium and tellurium crystalize in helical chainlike structures and thus exhibit fascinating properties. By performing first-principles calculations, we have researched the linear and nonlinear optical (NLO) properties of...

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