| Abstract: | The various technologies presented herein relate to various hybrid
phononic-photonic waveguide structures that can exhibit nonlinear
behavior associated with traveling-wave forward stimulated Brillouin
scattering (forward-SBS). The various structures can simultaneously guide
photons and phonons in a suspended membrane. By utilizing a suspended
membrane, a substrate pathway can be eliminated for loss of phonons that
suppresses SBS in conventional silicon-on-insulator (SOI) waveguides.
Consequently, forward-SBS nonlinear susceptibilities are achievable at
about 3000 times greater than achievable with a conventional waveguide
system. Owing to the strong phonon-photon coupling achievable with the
various embodiments, potential application for the various embodiments
presented herein cover a range of radiofrequency (RF) and photonic signal
processing applications. Further, the various embodiments presented
herein are applicable to applications operating over a wide bandwidth,
e.g. 100 MHz to 50 GHz or more. |