title: Optical torque on small bi-isotropic particles.
abstract: We establish the equations for the time-averaged optical torque on dipolar bi-isotropic particles. Due to the interference of the scattered fields, it has a term additional to the one that is commonly employed in theory and experiments. Its consequences for conservation of energy, angular momentum, and effects like negative torques are discussed.
authors.forename: Manuel
authors.initials: M
authors.lastname: Nieto-Vesperinas