Temporal oscillations of light transmission through dielectric microparticles subjected to optically induced motion

Abstract

We consider light-induced binding and motion of dielectric microparticles in an optical waveguide that gives rise to a back-action effect such as light transmission oscillating with time. Modeling the particles by dielectric slabs allows us to solve the problem analytically and obtain a rich variety of dynamical regimes both for Newtonian and damped motion. This variety is clearly reflected in temporal oscillations of the light transmission. The characteristic frequencies of the oscillations are within the ultrasound range of the order of 10 5 Hz for micron size particles and injected power of the order of 100 mW. In addition, we consider driven by propagating light dynamics of a dielectric particle inside a Fabry-Perot resonator. These phenomena pave a way for optical driving and monitoring of motion of particles in waveguides and resonators.

Giant resonant enhancement of optical binding of dielectric particles

“…It is remarkable that the equilibrium distances between disks is traversed close to the anti-bonding resonance shown by dotted line. That situation was first reported for two dielectric slabs which can move in waveguide that is equivalent to Fabry-Perot resonator with high Q resonances [46]. Fig.…”

Resonant binding of dielectric particles to metal surface without plasmonics

“…Indeed, this conclusion holds for the resonances with lower l. However, for the extremely high Q resonances with l = 5, 6, ... one can see that the steady distances of silicon sphere from the metal surface are almost independent of L and very close to the resonant frequencies. That tendency for particles to place into positions close to resonances was revealed also in Fabry-Perot resonator with movable mirrors [28]. By differentiation of the force over z it is easy to find vibrational frequency of sphere around equilibrium positions.…”

Fluid photonic crystal from colloidal quantum dots

“…(3) it is sufficient to use the unperturbed field of the laser beams (1). We note, however, that the optical force requires more sophisticated self-consistent calculations if the particle itself considerably affects the electric field distribution as it can happen, e.g., in the case of strong light confinement [29][30][31][32] . The dielectric response of the QD caused by exciton transitions within the dot has a resonant behavior and the polarizability has the form 26…”

“…The one-dimensional motion of dielectric particles in an viscous medium in an optical waveguide was considered in Ref. 32.…”