نتایج جستجو برای: electrostriction

تعداد نتایج: 212  

2013
Amir R. Ali Tindaro Ioppolo Volkan Marc Christensen Duncan MacFarlane

The detection of electric field by monitoring the optical whispering gallery mode shifts of polymeric microspheres is demonstrated. Two types of spheres are considered; (i) a polydimethylsiloxane (PDMS) sphere with 60 parts base silicon elastomer-to-1 part polymer curing agent by volume and; (ii) a silica sphere coated with a PDMS (uncured) base. The optical mode shifts are caused by perturbati...

1999
S. ANTOCI

A macroscopic theory for the dynamics of elastic, isotropic matter in presence of electromagnetic fields is proposed here. We avail of Gordon’s general relativistic derivation of Abraham’s electromagnetic energy tensor as starting point. The necessary description of the elastic and of the inertial behaviour of matter is provided through a fourdimensional generalisation of Hooke’s law, made poss...

2014
Yuchi He Gang Sun Kenichiro Koga Limei Xu

Water confined within nanoscale geometries under external field has many interesting properties which is very important for its application in biological processes and engineering. Using molecular dynamics simulations, we investigate the effect of external fields on polarization and structure as well as phase transformations of water confined within carbon nanotubes. We find that dipoles of wat...

Journal: :Optics express 1999
D Kovsh D Hagan E Van Stryland

We present the results of modeling of nanosecond pulse propagation in optically absorbing liquid media. Acoustic and electromagnetic wave equations must be solved simultaneously to model refractive index changes due to thermal expansion and/or electrostriction, which are highly transient phenomena on a nanosecond time scale. Although we consider situations with cylindrical symmetry and where th...

Journal: :Applied optics 1995
E B Cummings I A Leyva H G Hornung

Laser-induced thermal acoustics (LITA) is a four-wave mixing technique that may be employed to measure sound speeds, transport properties, velocities, and susceptibilities of fluids. It is particularly effective in high-pressure gases (>1 bar). An analytical expression for LITA signals is derived by the use of linearized equations of hydrodynamics and light scattering. This analysis, which incl...

2000
Richard A. Holroyd Kengo Itoh

The behavior of excess electrozis in supercritical ethane was investigated by measiuing mobility and reaction rates. Nobilities were measured by means of a time-of-flight method at 306-320K as a function of pressure. Mobility values decreased at all temperatures with increasing pressure, but showed a small minimum or a shoulder at the pressure where the .. .. .. compressmmy X7has a peak. Electr...

2015
Paul J. Ackerman Jao van de Lagemaat Ivan I. Smalyukh

Some of the most exotic condensed matter phases, such as twist grain boundary and blue phases in liquid crystals and Abrikosov phases in superconductors, contain arrays of topological defects in their ground state. Comprised of a triangular lattice of double-twist tubes of magnetization, the so-called 'A-phase' in chiral magnets is an example of a thermodynamically stable phase with topological...

Journal: :Materials 2016
David Ascienzo Haochen Yuan Steve Greenbaum Thorsten J M Bayer Russell A Maier Jian-Jun Wang Clive A Randall Elizabeth C Dickey Haibin Zhao Yuhang Ren

We report on the detection of electric field-induced second harmonic generation (EFISHG) from the anode interfaces of reduced and oxidized Fe-doped SrTiO₃ (Fe:STO) single crystals. For the reduced crystal, we observe steady enhancements of the susceptibility components as the imposed dc-voltage increases. The enhancements are attributed to a field-stabilized electrostriction, leading to Fe:Ti-O...

2016
M. Kuhn M. Renzler J. Postler S. Ralser S. Spieler M. Simpson H Linnartz A. G. G. M. Tielens J. Cami A. Mauracher Y. Wang M. Alcamí F. Martín M. K. Beyer R. Wester A. Lindinger P. Scheier

Helium has a unique phase diagram and below 25 bar it does not form a solid even at the lowest temperatures. Electrostriction leads to the formation of a solid layer of helium around charged impurities at much lower pressures in liquid and superfluid helium. These so-called 'Atkins snowballs' have been investigated for several simple ions. Here we form HenC60+ complexes with n exceeding 100 via...

Journal: :ACS nano 2012
Yunseok Kim Anna N Morozovska Amit Kumar Stephen Jesse Eugene A Eliseev Fabien Alibart Dmitri Strukov Sergei V Kalinin

Nanoscale electromechanical activity, remanent polarization states, and hysteresis loops in paraelectric TiO(2) and SrTiO(3) thin films are observed using scanning probe microscopy. The coupling between the ionic dynamics and incipient ferroelectricity in these materials is analyzed using extended Landau-Ginzburg-Devonshire (LGD) theory. The possible origins of electromechanical coupling includ...

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