Comparison between Ferromagnetic and Ferroelectric Optical Switch Devices in Terms of the Response to the Electric Field

2018 ◽  
Vol 23 ◽  
pp. 1-7
Author(s):  
Rabi Noori Hammudi ◽  
Sudad Salman Al-Bassam ◽  
Rawa Khalil Ibrahim ◽  
Aseel Ibrahim Mahmood ◽  
Peter Kopčanský ◽  
...  
Keyword(s):  
Magnetic Material ◽  
Electric Field ◽  
Response Time ◽  
Applied Electric Field ◽  
Optical Switch ◽  
Ferroelectric Material ◽  
Optical Effect ◽  
Constituent Material ◽  
Electro Optic ◽  
The Difference

In this work we have studied the electro-optical effect of two types of ferronematic nanoparticles. The first sample doped with magnetic material Fe3O4 and the second sample doped with a ferroelectric material SbSI. The difference in the two types of material that has been vaccinated led to different values of electro-optic properties because of the different susceptibility of materials. We have noticed that the material SbSI was more responsive to the applied electric field due to the nature of the constituent material (electric material) than the Fe3O4 ferromagnetic. The response time for the material SbSI is less than the response time of the ferromagnetic Fe3O4, that led to make the material SbSI best in the optical switch applications.

Shape of piezoelectric hysteresis loop for non-ferroelastic switching

2003 ◽  
Vol 784 ◽  
Author(s):  
A. K. Tagantsev ◽  
P. Muralt ◽  
J. Fousek
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
Hysteresis Loop ◽  
Single Crystals ◽  
Applied Electric Field ◽  
Piezoelectric Coefficient ◽  
Hysteresis Loops ◽  
Simple Theory ◽  
The Difference

ABSTRACTA simple theory for the shape of the piezoelectric hysteresis loops (piezoelectric coefficient d vs. applied electric field E) is developed for the case of non-ferroelelastic 180° switching in ferroelectrics. The theory provides explanations for specific features of piezoelectric hysteresis loops, which have been observed in single crystals, thin films and in ceramics in particular. The piezoelectric coefficient may show a “hump”, i.e. when E decreases from the tip of the loop down to zero, d passes through a maximum, and a “nose”, i.e. a self-crossing of the loop close to its tips. The theory also explains the difference in the coercive fields seen in the polarization and piezoelectric loops.

ELECTRO-OPTIC EFFECT IN A SEMI-PARABOLIC QUANTUM WELL WITH AN APPLIED ELECTRIC FIELD

2003 ◽  
Vol 17 (09) ◽  
pp. 347-354 ◽  
Author(s):  
LI ZHANG ◽  
HONG-JING XIE
Keyword(s):  
Electric Field ◽  
Quantum Well ◽  
Applied Electric Field ◽  
Field Effect ◽  
Harmonic Oscillation ◽  
Electric Field Effect ◽  
Confining Potential ◽  
Compact Density ◽  
Electro Optic ◽  
Potential Frequency

By using the compact density matrix approach, the electro-optic effect (EOE) in a semi-parabolic quantum well (QW) with an applied electric field has been theoretically investigated. Via a variant of displacement harmonic oscillation, the exact electronic states in the semi-parabolic QW with an applied electric field are obtained. Numerical results on typical GaAs material reveal that the electro-optic effect nearly linearly increases with the increasing of magnitude of the electric field, but it monotonously decreases with the increasing of confining potential frequency of the semi-parabolic QW. The EOE in the model investigated is 102 times larger than that in the symmetric parabolic QW under the same electric field and the same frequency of parabolic confining potential, which is due to the self-asymmetry of the system and the electric field effect.

Piezoelectric properties of rhombohedral ferroelectric materials with phase transition

2015 ◽  
Vol 08 (03) ◽  
pp. 1540008 ◽  
Author(s):  
Xiaofang Zhao ◽  
A. K. Soh
Keyword(s):  
Electric Field ◽  
Applied Electric Field ◽  
Piezoelectric Coefficient ◽  
Intermediate Phase ◽  
Transition Process ◽  
Field Method ◽  
Ferroelectric Material ◽  
Transformation Process ◽  
Ferroelectric Materials ◽  
Phase Field Method

The temporal evolution of domain structure and its piezoelectric behavior of ferroelectric material BaTiO 3 during the transition process from rhombohedral to tetragonal phase under an applied electric field have been studied by employing Landau–Ginzburg theory and the phase-field method. The results obtained show that, during the transformation process, the intermediate phase was monoclinic MA phase, and several peak values of piezoelectric coefficient appeared at the stage where obvious change of domain pattern occurred. In addition, by comparing the cases of applied electric field with different frequencies, it was found that the maximum piezoelectric coefficient obtained decreased with increasing frequency value. These results are of great significance in tuning the properties of engineering domains in ferroelectrics, and could provide more fundamentals to the design of ferroelectric devices.

Influence of applied electric field on crystalline structure and thermo-optical effect of oriented PVDF thin films

2009 ◽  
Author(s):  
Wei-guo Liu ◽  
Ying-xue Xi ◽  
Hui-qing Fan ◽  
Chen Yang ◽  
Xiao-ling Niu
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
Crystalline Structure ◽  
Applied Electric Field ◽  
Optical Effect

scholarly journals Precise Measurements of the Quadratic Electro-Optic Effect in KH2PO4 Crystals Using a Sénarmont-Type System

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5435
Author(s):  
Marek Izdebski
Keyword(s):  
Electric Field ◽  
Applied Electric Field ◽  
Type System ◽  
Induced Polarization ◽  
Transmission Characteristic ◽  
Specific Point ◽  
Relative Temperature ◽  
New Approach ◽  
Temperature Changes ◽  
Electro Optic

This paper presents precise measurements of the temperature dependencies of the quadratic electro-optic coefficients g1111−g1122 and ne3g3333−no3g1133 in KH2PO4 crystals. In addition to traditional electro-optic coefficients describing changes in the function of an applied electric field, intrinsic coefficients, defined in terms of induced polarization, are also considered. Both intrinsic coefficients decrease with increases in temperature, but the relative temperature changes are of different orders of magnitude: 10−4 and 10−3 K−1. A Sénarmont-type setup was used for the electro-optic measurements. To achieve the best accuracy, a new approach was developed, in which, instead of using only one specific point on the modulator’s transmission characteristic, the operating point is changed during the measurements.

Dynamic Response of the Electro-Optic Effect in Epitaxial Ferroelectric Thin Films

1999 ◽  
Vol 597 ◽  
Author(s):  
B. H. Hoerman ◽  
J. C. Majewski ◽  
B. M. Nichols ◽  
A. Teren ◽  
B. W. Wessels
Keyword(s):  
Thin Films ◽  
Electric Field ◽  
Dynamic Response ◽  
Applied Electric Field ◽  
Physical Mechanism ◽  
Ferroelectric Thin Films ◽  
Epitaxial Thin Films ◽  
Electronic Polarizability ◽  
Electro Optic ◽  
Logarithmic Dependence

AbstractThe dynamic response of the electro-optic coefficients and the electronic polarizability for epitaxial thin films of KnbO3 and BaTiO3 are measured. For these two systems a logarithmic dependence of the electro-optic response and the polarization on time was observed after removal of an applied electric field. The dynamic response of the electro-optic effect and the polarization of the films are attributed to the same physical mechanism, which we associate with the dynamic response of ferroelectric nanodomains.

Enhancement of the Analyte Mass Transport in a Microfluidic Biosensor by Deformation of Fluid Flow and Electrothermal Force

2016 ◽  
Vol 138 (8) ◽  
Author(s):  
Marwa Selmi ◽  
Randa Khemiri ◽  
Fraj Echouchene ◽  
Hafedh Belmabrouk
Keyword(s):  
Electric Field ◽  
Response Time ◽  
Flow Velocity ◽  
Applied Electric Field ◽  
Fluid Motion ◽  
Analyte Concentration ◽  
Inlet Flow ◽  
Sensor Performance ◽  
Diffusion Limited ◽  
Microfluidic Biosensor

Fluid deformations around a cylinder combined with an applied electric field are used to enhance the kinetics rate and the response time of heterogeneous immunosensors in microfluidic systems. The insertion of an obstacle in the microchannel as well as the application an applied electric field are used to change the fluid motion topology that improves the transport of diffusion-limited proteins. The response time is affected by various parameters such as the inlet flow velocity, the initial analyte concentration and the obstacle position. The effects of the parameters related to the kinetics reaction on the sensitivity and the performance of the biosensor have been studied numerically. Numerical results reveal that an appropriate choice of the inlet analyte and inlet flow velocity with applied electric field may reduce considerably the response time and enhance the microfluidic sensor performance.

LIQUID CRYSTLASLIGHT SCATTERING BY FLUCTUATIONS INDUCED BY AN APPLIED ELECTRIC FIELD IN A NEMATIC LIQUID CRYSTAL (APAPA)

1972 ◽  
Vol 33 (C1) ◽  
pp. C1-63-C1-67 ◽  
Author(s):  
M. BERTOLOTTI ◽  
B. DAINO ◽  
P. Di PORTO ◽  
F. SCUDIERI ◽  
D. SETTE
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Nematic Liquid Crystal ◽  
Applied Electric Field
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