title: Hybrid surface phononic waveguide using hyperbolic boron nitride.
abstract: Sub-diffraction limited waveguides have been studied as a means to manipulate light into nanoscale regions. Hybrid waveguides are popular candidates in optical regimes for subwavelength confinement and long range propagation. However, advances in the mid-IR are lacking due to high propagation losses and limited confinement. Here we present the first analysis of hybrid phononic waveguide using a hyperbolic material h-BN to generate surface phonon polaritons. The strong coupling between the photonic cylinder and phononic surface enhances the confined field up to 10-3λo2(λois free-space wavelength) and enables propagation distances up to 100 λo. Our work is fully compatible with integrated polaritonic devices in the mid-IR and provides a systematic approach to design hybrid phononic waveguides.
authors.forename: Yuancheng
authors.initials: Y
authors.lastname: Xu
authors.forename: Navaneeth
authors.initials: N
authors.lastname: Premkumar
authors.forename: Yuchen
authors.initials: Y
authors.lastname: Yang
authors.forename: Brian A
authors.initials: BA
authors.lastname: Lail