Abstract
We present a scheme for reversible and tunable on-chip optical mode conversion based on dynamic grating in a hybrid photonic-phononic waveguide. The dynamic grating is built up through the acousto-optic effect and the theoretical model of the optical mode conversion is developed by considering the geometrical deformation and refractive index change. Three kinds of mode conversions are able to be realized using the same hybrid waveguide structure in a large bandwidth by only changing the launched acoustic frequency. The complete mode conversion can be achieved by choosing a proper acoustic power under a given waveguide length.
Highlights
The z-direction rectangular silicon (Si) waveguide is embedded in silicon nitride (Si3N4) slab perforated by a honeycomb lattice of circular holes, and designed for supporting the following the x-polarization optical modes, E1x1, E
Si waveguide serve as optical waveguide to confine the optical modes and is introduced as a line defect in the Si3N4 honeycomb phononic crystal to form a phononic crystal waveguide (PCW), which will confine the acoustic wave in the hybrid waveguide
The longitudinal acoustic wave with frequency at Ω is launched into the hybrid waveguide, which leads to the establishment of dynamic grating for driving the resonant coupling between different optical modes
Summary
The longitudinal acoustic wave with frequency at Ω is launched into the hybrid waveguide, which leads to the establishment of dynamic grating for driving the resonant coupling between different optical modes. In the mode conversion between different optical modes with same polarization, the longitudinal acoustic wave modulates the refractive index of waveguide for forming a dynamic grating[5].
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