We propose optical frequency comb generation in a monolithic micro-ring resonator. Being different from the previously reported nonlinear optical frequency combs, our scheme is based on more efficient quadratic frequency conversion rather than the third-order nonlinearity. To overcome the phase mismatch, a partly poled nonlinear ring is employed. Cascading second harmonic generation and parametric down conversion processes thus are realized through quasi-phase matching (QPM). Coupling equations are used to describe the related nonlinear interactions among different whispering-gallery modes, showing some interesting characteristics that are different from conventional QPM technology.
Condensed matter systems are potential candidates to realize the integration of quantum information circuits. Surface
phonon polariton (SPhP) is a special propagation mode in condensed matter systems. We present an investigation on the
entanglement of SPhP modes. The entangled pairs are generated from entangled photons injected to the system.
Quantum performances of entangled SPhPs are investigated by using the interaction Hamiltonian and the perturbation
theory. The wave mechanics approach is taken to describe the coupling process as a comparison. Finally, the correlation
of system is examined. A whole set of descriptions of SPhP entanglement thus are presented.
In this paper we investigate the temperature characteristic of an optical microfiber coil resonator (OMCR) which is
wrapped on Teflon coated PMMA rob and embedded in low index polymer Teflon. The micro fiber used to fabricated
the OMCR was 4 ~ 5μm in diameter and 14 mm in waist region length. The PMMA rob has a diameter of 2 mm. Our
sample shows high temperature sensitivity as much as 80 pm/°C. The test result suggests OMCR could be of good value
in application of temperature sensing.