Title : Toward manipulating light scattered by a single nanoparticle: a scattering-eigenchannel analysis
The control of the nanoparticle scattering is key for many applications such as lasing and nonlinear optical interaction at the nanoscale. In this talk, I will discuss the possibility to manipulate light scattered by a single nanoparticle through wavefront shaping via theoretical and numerical analysis. Wavefront shaping was previously used to control interference of light through opaque random media composed by a large number of scattering nanoparticles, but it is still an open question that whether wavefront shaping is also available for controlling light scattering of a single nanoparticle. To answer this question, we employ scattering matrix to describe the scattering process of a single nanoparticle. By further analysing the scattering eigenchannels of the scattering matrix, we find that a single nanoparticle hosts more than one strongly scattering eigenchannel. This intriguing finding indicates that wavefront control on the incident light is capable of manipulating scattered light from a single nanoparticle. Besides, we also find that these scattering eigenchannels are related to different resonant leaky modes of the nanoparticle. Moreover, by analysing the spectra of these highly scattering eigenchannels, both the short range and the long range correlations are found playing an important role in the spectra. Our analysis on the scattering eigenchannels offers new perspectives on the manipulation of light scattering by a single nanoparticle, showing that wavefront shaping is efficient for the manipulation of nanoparticle scattering and relevant applications.