We consider the helicity and chirality of the free electromagnetic field, and advocate the
former as a means of characterising the interaction of chiral light with matter. This is in view …

We introduce a definition of the electromagnetic chirality of an object and show that it has an
upper bound. Reciprocal objects attain the upper bound if and only if they are transparent for …

Circular dichroism, that is, the differential absorption of a system to left and right circularly
polarized light, is one of the only techniques capable of providing morphological information …

Chirality is an intriguing property of certain molecules, materials or artificial nanostructures,
which allows them to interact with the spin angular momentum of the impinging light field …

Chirality of light is of fundamental importance in several enabling technologies with growing
applications in life sciences, chemistry and photodetection. Recently, some attention has …

We outline a methodology for efficiently computing the electromagnetic response of
molecular ensembles. The methodology is based on the link that we establish between …

The forward and backward scattering off linear systems with discrete rotational symmetries
Rz (2π/n) with n≥ 3 are shown to be restricted by symmetry reasons. Along the symmetry …

Maxwell's equations in curved space time are invariant under electromagnetic duality
transformations. We exploit this property to constrain the design parameters of …

Treating polarization by means of the electromagnetic helicity allows to obtain new insights
and design guidelines in different problems: Optical activity, zero backscattering …

Optically active artificial structures have attracted tremendous research attention. Such
structures must meet two requirements: Lack of spatial inversion symmetries and, a …