Theoretical models and experimental techniques are employed to study interactions of light and matter. The scope of research includes determination of effective optical and radiative properties of nano-, micro- and macro-structured materials, as well as studies of light/radiation propagation by accounting for spectral and directional effects in the near- and far-fields. Classical electrodynamics, geometrical optics, macroscopic radiative transfer (i.e. based on the radiative transfer equation—RTE) and quantum mechanics are used to cover a broad range of length scales.