Abstract
On-chip nonlinear optics is a thriving research field, which creates transformative opportunities for manipulating classical or quantum signals in small-footprint integrated devices. Since the length scales are short, nonlinear interactions need to be enhanced by exploiting materials with large nonlinearity in combination with high-Q resonators or slow-light structures. This, however, often results in simultaneous enhancement of competing nonlinear processes, which limit the efficiency and can cause signal distortion. Here, we exploit the frequency dependence of the optical density-of-states near the edge of a photonic bandgap to selectively enhance or inhibit nonlinear interactions on a chip. We demonstrate this concept for one of the strongest nonlinear effects, stimulated Brillouin scattering using a narrow-band one-dimensional photonic bandgap structure: a Bragg grating. The stimulated Brillouin scattering enhancement enables the generation of a 15-line Brillouin frequency comb. In the inhibition case, we achieve stimulated Brillouin scattering free operation at a power level twice the threshold.
Highlights
On-chip nonlinear optics is a thriving research field, which creates transformative opportunities for manipulating classical or quantum signals in small-footprint integrated devices
We present an experimental demonstration of an alternative approach, in which the efficiency of stimulated Brillouin scattering (SBS) is tailored by the presence of a photonic bandgap (PBG)
We have demonstrated a powerful and flexible way to tailor the strength of nonlinear interactions, from strong enhancement to full suppression, at fixed input power in an on-chip highly nonlinear waveguide
Summary
On-chip nonlinear optics is a thriving research field, which creates transformative opportunities for manipulating classical or quantum signals in small-footprint integrated devices. We exploit the frequency dependence of the optical density-of-states near the edge of a photonic bandgap to selectively enhance or inhibit nonlinear interactions on a chip. We demonstrate this concept for one of the strongest nonlinear effects, stimulated Brillouin scattering using a narrow-band one-dimensional photonic bandgap structure: a Bragg grating. A power-efficient way to generate SBS, would advance on-chip SBS applications, in particular Brillouin lasers[14] and Brillouin frequency combs[15] From another point of view, nonlinear interactions can limit the power efficiency in optical fibre communication links[16]. The latter study proposed a linear sequence of SBS-based slow-light and grating-based slow-light to increase the system’s overall delay[24]
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
