On two optomechanical effects of laser-induced electrostriction in dielectric liquids

Abstract

This paper presents electrostriction from the phenomenological perspective, and gives details on two mechanical effects arising from lasermatter interaction. Electrostriction is the tendency of materials to compress in the presence of a varying electric field. In this paper, the investigated materials are polar and nonpolar dielectric liquids. It is stressed that the dominant factor is the time evolution of the laser pulse, which causes tensile stresses and acoustic waves. The study is supported by experimental realization of electrostriction, which can be detected only at favourable conditions (observed in water, but not in castor oil). This study will shed light in developing measurement techniques (e.g., laser-induced grating spectroscopy) and in explaining the onset of cavities and laser-induced liquid breakdown.

Terahertz pump–probe of liquid water at 12.3 THz

“…Optoacoustic effects originate from the fact that the optical properties of a medium can change as a result of density variations, 62 which can trigger the generation of acoustic waves. [70][71][72][73][74][75][76] When radiation is strongly absorbed, as in the case of Terahertz spectroscopy on liquid water, 59,60 thermoacoustic effects dominate. In first approximation, the absorption triggers thermal expansion that, in turn, can induce a pressure wave with associated mass displacement and density perturbations.…”

Time-dependent theory of optical electro- and magnetostriction

“…In some previous literature, asymmetric SEM tensors have been introduced [76], but in our work, all SEM tensors are symmetric and strictly based on the classical definition in Eq. (37). We require that the SEM tensors of the total system and its subsystems, e.g., the material and field+interaction subsystems, must all transform between inertial frames in a relativistically covariant way.…”

“…Experimental studies of electrostriction have also revealed interesting phenomena, such as the giant electrostriction [15][16][17][18][19][20][21][22][23][24][25], negative electrostriction [26,27], and deformations of liquid crystals [28,29] and biological cells [30]. On the theoretical side, electrostriction has also been under extensive study [31][32][33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48].…”

Laser Induced “Counter” Convection in Water

“…Additionally, it was theoretically demonstrated that the electrostrictive forces induced by the laser in liquid could be the source of acoustic pulses [8,9]. In another example the volumetric ponderomotive force occurs when a high voltage is rapidly applied to a sharp needle-like electrode produce region with significant negative pressure leading to the rupture of liquid, i.e.…”