We investigate utilizing nonlinear metamaterials for generating entangled photons with expected characteristics. Metamaterials are artificial structures with unique properties which are not attainable with naturally existing materials. In recent years, owing to high designability and flexibility, metamaterials have been deeply investigated and utilized for constructing novel photonic devices. Through tailoring the nanostructures of metamaterials with feasible nonlinear optical character, we can control the PDC process inside the medium to generate desirable photon states. Various spatial perturbations of optical parameters with special distributions can be introduced in via suitable arraying of elements of metamaterials. The spatial properties of entangled photons such as orbital angular momentum can be flexibly engineered. The nonlinear metamaterial provides a flexible platform for steering photonic entanglement.
Utilizing the spin degree of freedom breaks new ground for designing photonic devices. Seeking out a suitable platform for flexible steering of photonic spin states is a critical task. In this work, we demonstrate a versatile Liquid crystal (LC) based platform for manipulating photonic spin and orbital states. Owing to the photoalignment technique, the local and fine tuning of the LC medium is effectively implemented to form various anisotropic microstructures. The light-matter interaction in the corresponding medium is tailored to control the evolution of photonic spin states. The physical mechanism of such a system is investigated, and the corresponding dynamical equation is obtained. The high flexibility endows the LC-based photonic system with great value to be used for Hamiltonian engineering. As an illustration, the optical analogue of intrinsic spin Hall effect (SHE) in electronic systems is presented. The pseudospins of photons are driven to split by the anisotropic effective magnetic field arising from the inhomogeneous spin-orbit interaction (SOI) in the twisting microstructures. In virtue of the designability of the LC-based platform, the form of the interaction Hamiltonian is regulated to present diverse PSHE phenomena, which is hard to be realized in the solid electronic systems. Some representative samples are prepared for experimental observation, and the results are in good agreement with theoretical predictions. We believe the tunable LC system may shed new light on future photonic quantum applications.
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.
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.
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.
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