This device incorporates two orthogonal nanopatterned linear optical cavities which support different types of optical guiding. Lastly, we are interested in novel cavity designs like that seen in Figure panel c. These nanostructured linear cavities enable a compact footprint and broadly tunable dispersion to support nonlinear processes. We also explore novel linear-cavity designs, without a microresonator structure. Moreover, incorporating other nanostructures into the PhCR architecture enable decreased threshold power for nonlinear processes and enhanced performance through optimal conversion of light from one state to another. Figure panel b shows a PhCR with multiple modulation periods imparted on a single device as seen in the zoom-in on the right. Indeed, PhCRs with multiple nanostructures are possible for multiple-mode frequency splitting for arbitrary, mode-by-mode dispersion design. Such PhCRs enable access to universal phase-matching for nonlinear optical processes even in devices which otherwise would not support such dynamics. The addition of a nano-scale modulation to the inner ring wall of a microresonator, a so-called photonic crystal microresonator (PhCR), enables single-mode frequency shifting for very fine dispersion tuning. Figure panel a shows images of the two microresonators in the network and the bottom trace is the measured synthesizer error measured over 10 minutes, demonstrating sub-Hz accuracy.Ĭommon approaches to frequency and phase-matching in integrated photonics are highly dispersion dependent and exceptionally challenging for certain device geometries, especially at visible wavelengths. Two nonlinear integrated photonic microresonators comprise the network where one creates an optical frequency comb and the other enables four-wave-mixing spectral translation to deterministically convert light to a target frequency. Indeed, we benchmark a nonlinear network by generating an optical frequency synthesizer with unprecedented operational bandwidth. By leveraging networks of nonlinear elements, we can overcome the existing limitations imposed by nonlinear processes. Nonetheless, these devices suffer frequency and phase-matching constraints just as in bulk nonlinear optical systems. Moreover, integrated photonic devices offer broadly reconfigurable phase-matching by controlling device geometry. The use of integrated photonics for nonlinear optical processes has demonstrated powerful control of optical fields at low optical powers due to tight optical mode confinement on a scalable, chip-scale platform. The horizontal (vertical) cavity guides Einstein (Debye) modes, which can independently be dispersion engineered for four-wave-mixing. (b) Photonic-crystal ring resonator with multiple frequency-shifting modulation periods. a) Nonlinear network for optical synthesis by spectral translation.
0 Comments
Leave a Reply. |