We present a method of incorporating the discrete dipole approximation (DDA) method with the point matching method to formulate the T -matrix for modeling arbitrarily shaped micro-sized objects. The T -matrix elements are calculated using point matching between fields calculated using vector spherical wave functions and DDA. When applied to microrotors, their discrete rotational and mirror symm...

We investigate the influence of local-field effects on the electromagnetic response of a collection of dipoles. We derive the local-field corrected static polarizability for a collection of dipoles in the case of a scatterer with uniform depolarization. We then use this correction within the discrete dipole approximation to study the scattering of an electromagnetic wave by a spherical particle...

We demonstrate reversible photoisomerizaton of azobenzene molecules on a single gold nanoparticle surface with alternating UV and visible irradiation, which is monitored by plasmon resonance Rayleigh scattering spectroscopy and stimulated by the discrete-dipole approximation method.