Optical deformation of homogeneous and core-shell spherical particles

Optical trapping and light scattering in atmospheric aerosol science

“…The T-matrix method is especially well suited to the calculation of optical forces acting on a particle in a trap. At the core of the full optical force calculation is the evaluation of the Maxwell stress tensor : 212,213,252–254 where E and H are the electric and magnetic fields, D = ε E and B = μ H are the auxiliary fields, and ε and μ denote the dielectric permittivity and magnetic permeability of the medium respectively. I is the identity tensor.…”

“…I is the identity tensor. The time-averaged radial component of gives the optical stress, also known as the radiation pressure or force density, 208,212,254 and the integral of this over the surface of the particle gives the total force on the particle. 213,252 The optical stress leads particles to become deformed, best exemplified by the optical stretcher developed to measure the mechanical properties of biological cells.…”

Mie scattering from optically levitated mixed sulfuric acid–silica core–shell aerosols: observation of core–shell morphology for atmospheric science

“…Further advances in the efficient modelling of core-shell Mie modelling can be found elsewhere. 68,69 3 Results and discussion…”

Determination of Condensate Material Properties from Droplet Deformation

“…The new shape is specified by The shape function, which is defined to be 0 for all positions on the droplet surface, can be identified as The normal vector can be expressed as To the first order in f , the normal vector is given by where a prime means derivative. The divergence of n is Equation thus becomes This equation can be solved by expanding both f (θ) and p ex (θ) in Legendre polynomials: For the latter, the expansion coefficients are Substituting eqs and into eq , one finds The shape perturbation caused by the optical stress of a laser beam (such as that operating in OT) was recently solved …”

“…The shape perturbation caused by the optical stress of a laser beam (such as that operating in OT) was recently solved. 17 The external pressure causes a deformation at either pole,…”