Several types of sensors used in physics are based on the detection of splittings of resonant
frequencies or energy levels. We propose here to operate such sensors at so-called …

A general theory of sensors based on the detection of splittings of resonant frequencies or
energy levels operating at so-called exceptional points is presented. Exploiting the complex …

It is a well-known fact that a single nanoparticle placed in the evanescent field of an optical
microdisk leads to coherent backscattering of light between counterpropagating whispering …

The resonant-state expansion (RSE), a rigorous perturbative method in electrodynamics, is
developed for three-dimensional open optical systems. Results are presented using the …

In optics, whispering gallery modes (WGMs) are modes of light that arise in cylindrically
symmetric structures. Their intensity profile is strongly confined around the interface of the …

Optical energy flow inside a dielectric microsphere exposed to an optical wave is usually
codirected with its wave vector. At the same time, if the optical field in a microparticle is in …

Shifts of the resonance frequency of high Q whispering gallery modes (WGMs) in spherical
dielectric microresonators by plasmonic nanoparticles can be greater than the WGM line …

We systematically investigate the evolution of resonant modes in a rolled-up microcavity as
the overlap length between structural notches increases, which presents a modulation …

In the Terahertz (THz) domain, we investigate both numerically and experimentally the
directional emission of whispering gallery mode resonators that are perturbed by a small …

The T-matrix method is one of the most versatile and efficient theoretical techniques widely
used for the computation of electromagnetic scattering by single and composite particles …