Strongly Nonlinear Superconducting Silicon Resonators

Intermodulation gain in nonlinear NbN superconducting microwave resonators

We report the measurement of intermodulation gain greater than unity in NbN superconducting stripline resonators. In the intermodulation measurements we inject two unequal tones into the oscillator—the pump and signal—both lying within the resonance band. At the onset of instability of the reflected pump we obtain a simultaneous gain of both the idler and the reflected signal. The measured gain...

Unusual Nonlinear Dynamics Observed in NbN Superconducting Microwave Resonators

We report on some unusual nonlinear dynamics observed in several NbN superconducting stripline microwave resonators. Among the nonlinear effects observed: abrupt bifurcations within the resonance lineshape, hysteretic behavior, hysteresis loops changing direction, resonance shift and critical coupling. Weak links forming at the boundaries of the columnar structure of the NbN films are hypothesi...

Extreme nonlinear phenomena in NbN superconducting stripline resonators

We study giant nonlinear phenomena that emerge near a bifurcation threshold (BT) in a microwave superconducting stripline resonator. Above the BT the system becomes astable and self-sustained modulation of the reflected power off the resonator occurs. The giant nonlinearity manifests itself in an extremely high intermodulation gain, accompanied by a very strong noise squeezing and period doubli...

Nonlinear Temperature-Dependent Transfer Characteristics of Silicon Photonic Microring Resonators

We investigate the nonlinear power transfer characteristics of a silicon photonic microring resonator. We show that the microring device behaves as a power limiter if the roll-off tail of its resonance is steeper than a simple Lorentzian lineshape. OCIS codes: (230.4110) Modulators; (230.4555) Coupled Resonators; (200.4650) Optical Interconnects.

Tunable Superconducting Split Ring Resonators