He made contributions to light scattering of electromagnetic waves, the theory of near-field microscopy. He made seminal contributions to the topic of coherent thermal emission and near-field radiative heat transfer. He made contributions to the field of nanoantennas including the proposal for using nanoantennas with single quantum emitters to control lifetime and directionalemission. His current research interests deals with revisiting fundamental quantum optics experiments with surface plasmons (wave-particle duality, Hong Ou Mandel experiment, photon-plasmon entanglement, electrical emission by tunnel effect) and controlling light-matter interaction at the nanoscale using resonators and collective effects.