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Related Concept Videos

Parallel Resonance01:23

Parallel Resonance

746
The parallel RLC circuit is an arrangement where the resistor (R), inductor (L), and capacitor (C) are all connected to the same nodes and, as a result, share the same voltage across them. The parallel RLC circuit is analyzed in terms of admittance (Y), which reflects the ease with which current can flow. The admittance is given by:
746
Characteristics of Series Resonant Circuit01:24

Characteristics of Series Resonant Circuit

812
Series resonance occurs in a circuit containing inductive (L), capacitive (C), and resistive (R) elements connected sequentially. At the resonance frequency, the inductive and capacitive reactances are equal in magnitude but opposite in sign, effectively canceling each other. This causes the circuit's impedance is minimal, primarily determined by the resistance R. The resonant frequency of an RLC circuit is defined as:
812

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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Enhanced parametric frequency conversion in a compact silicon-graphene microring resonator.

Mengxi Ji, Heng Cai, Like Deng

    Optics Express
    |July 21, 2015
    PubMed
    Summary

    We demonstrated enhanced four-wave mixing (FWM) in silicon microring resonators using graphene. This silicon-graphene hybrid device showed a 6.8 dB conversion efficiency boost, highlighting its nonlinear properties.

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    Area of Science:

    • Photonics
    • Materials Science
    • Nanotechnology

    Background:

    • Nonlinear optics in integrated photonic devices is crucial for optical signal processing.
    • Silicon photonics offers a scalable platform, but its Kerr nonlinearity is limited.
    • Graphene exhibits exceptionally high optical nonlinearity, making it a promising material for enhancing photonic devices.

    Purpose of the Study:

    • To demonstrate enhanced four-wave mixing (FWM) in a silicon microring resonator by integrating monolayer graphene.
    • To quantify the improvement in conversion efficiency due to graphene's giant nonlinearity.
    • To investigate the nonlinear properties of the silicon-graphene hybrid waveguide.

    Main Methods:

    • Fabrication of a silicon microring resonator with an integrated monolayer graphene layer.
    • Characterization of four-wave mixing (FWM) performance in the silicon-graphene microring (SGM) resonator.
    • Development of a nonlinear propagation model to analyze the optical Kerr coefficient.

    Main Results:

    • A maximum enhancement of 6.8 dB in conversion efficiency was achieved in the SGM resonator.
    • The nonlinear propagation model confirmed a significant increase in nonlinearity.
    • The optical Kerr coefficient of the silicon-graphene hybrid waveguide was found to be three times larger than that of a pure silicon waveguide.

    Conclusions:

    • Monolayer graphene effectively enhances the four-wave mixing performance in silicon microring resonators.
    • The silicon-graphene hybrid approach offers a promising route to boost nonlinear optical effects in integrated photonics.
    • This work paves the way for more efficient on-chip optical signal processing devices.