Mie‐driven directional nanocoupler for Bloch surface wave photonic platform
Dmitry N. Gulkin, Anna A. Popkova, Boris I. Afinogenov, Daniil A. Shilkin, Kęstutis Kuršelis, Boris N. Chichkov, Vladimir O. Bessonov, Andrey A. Fedyanin
Abstract
Abstract Modern integrated photonic platforms should combine low‐loss guiding, spectral flexibility, high light confinement, and close packing of optical components. One of the prominent platforms represents a one‐dimensional photonic crystal combined with dielectric nanostructures that manipulate low‐loss Bloch surface waves (BSWs). Proper design of nanostructures gives rise to a variety of optical resonances suitable for efficient capturing and controlling light. In this work, we achieve color‐selective directional excitation of BSWs mediated by Mie resonances in a semiconductor nanoparticle. We show that a single silicon nanoparticle can be used as a subwavelength multiplexer switching the BSW excitation direction from forward to backward within the 30 nm spectral range with its central wavelength governed by the nanoparticle size. Our work opens a route for the on‐demand fabrication of photonic nanocouplers with tailored optical properties and submicron footprint.