Exceptional points (EPs) in whispering-gallery-mode microresonators systems have attracted substantial attention due to their intriguing and anomalous optical characteristics. Recently, EPs have been experimentally observed in silicon microrings with coupling manipulation elements, such as an S-shaped waveguide and notch. In this paper, the observation of EP in a nanocylinder-loaded silicon microring is experimentally demonstrated. The device consists of a 5- μm microring with two nanocylinders placed close to the outer edge of the microring. By tailoring the size and position of the two nanocylinders, the fully asymmetric coupling between the clockwise- and counterclockwise-propagating modes occurs, leading to the implementation of EP. Experimentally, the spectral response is investigated by single-side excitation from clockwise and counter-clockwise directions. The reciprocal transmission and nonreciprocal reflection spectra are observed, which confirms the proposed device works in the vicinity of EP. The construction of EP in silicon microring paves the way to basic science and applied technology in non-Hermitian physics.
We propose to leverage a silicon-organic hybrid integration structure to implement an integrated entangled photon pair source with high photon pair generation rate. This method combines the weak nonlinear absorption of organic materials with the high light confinement of silicon waveguides. Due to the supression of TPA and FCA, the pump power saturation threshold of the hybrid waveguide can be greatly increased. Therefore, with the high nonlinear coefficient and strong pump power, this hybrid integrated structure can achieve high photon pair generation rate. This work shows that silicon-organic hybrid integration could be a competitive platfrom for quantum photonic circuits.
We demonstrate an EP-based sensor based on exceptional point(EP) of nanocylinders-loaded silicon microring for single particle detection. The EP is implemented by tailoring the spatial phase difference between the two nanocylinders placed close to the microring. When a nanoparticle is adsorbed onto the surface of the silicon microring, the degeneracy of two eigenvectors of the silicon microring is lifted, leading to mode splitting in the transmission spectrum. The wavelength difference of the split-mode is proportional to the square-root of the perturbation. To the best of our knowledge, this is the first sensor leveraging the EP of a silicon microring for single nanoparticle detection
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