Mie-driven directional nanocoupler for Bloch surface wave photonic platform

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