Periodic arrays of metallic nanostructures have emerged as ideal candidates to control light- matter interaction due to their ability to support collective excitations known as lattice resonances. These modes arise from the coherent multiple scattering of the nanoparticles in the array and give rise to strong and spectrally narrow optical responses. For this reason, periodic arrays of nanoparticles supporting lattice resonances have been exploited for a wide range of applications, such as ultrasensitive biosensing, solar energy harvesting, and nanoscale light production. In this context, a complete theoretical understanding of the optical response of periodic arrays of nanostructures is essential to fully leverage them for different purposes. Here, we explore several recent works dedicated to characterizing the lattice resonances supported by periodic arrays of nanoparticles. In particular, we discuss the use of arrays with complex multiparticle unit cells to manipulate the properties of lattice resonances, as well as the excitation of these modes by localized sources and light beams of finite width. The results of these works serve to advance the theoretical understanding of lattice resonances and therefore can inspire new applications seeking to exploit their extraordinary properties.
Authors: Lauren Zundel1, Alejandro Manjavacas1,2
1Department of Physics and Astronomy, University of New Mexico, USA 2Instituto de Óptica (IO−CSIC), Consejo Superior de Investigaciones Científicas, Spain