A bi-periodic nanostructuration consisting of a super-periodicity added to a nanohole lattice of sub-wavelength pitch is demonstrated to provide both modal confinement and wavelength selectivity within a hybrid III-V on Silicon waveguide. The wavelength selective behavior stems from finely-tuned larger holes. Such bi-periodic hybrid waveguides have been fabricated by oxide-free bonding III-V material on Silicon and display well defined stopbands. Such nanostructured waveguides offer the versatility for designing advanced optical functions within hybrid devices. Moreover, keeping the silicon waveguide surface planar, such nanostructured waveguides are compatible with electrical operation across the oxide-free hybrid interface.
Reference:
Biperiodic nanostructured waveguides for wavelength-selectivity of hybrid photonic devices,
A. Talneau, X. Pommarède, A. Itawi, K. Pantzas, A. Lupu, and H. Benisty
Optics Letters Vol. 40, Issue 22, pp. 5148-5151 (2015) / DOI : https://doi.org/10.1364/OL.40.005148
