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Measurement of Quantum Interference in a Silicon Ring Resonator Photon Source
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Electrically controlled second-harmonic generation in silicon-compatible plasmonic slot waveguides: a new modulation

Jihua Zhang, Eric Cassan, Xinliang Zhang

    Optics Letters
    |July 1, 2014
    PubMed
    Summary

    This study explores active electro-optical control of nonlinear second-harmonic generation (SHG) in plasmonic slot waveguides. Researchers demonstrated voltage-controlled SHG, enabling high-speed modulation and ultrafast electrical signal detection.

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    Area of Science:

    • Photonics and Plasmonics
    • Nonlinear Optics
    • Materials Science

    Background:

    • Nonlinear optical phenomena like second-harmonic generation (SHG) are crucial for frequency conversion.
    • Plasmonic slot waveguides offer enhanced light confinement for nonlinear interactions.
    • Electro-optical control provides a pathway for active modulation of optical signals.

    Purpose of the Study:

    • To theoretically investigate active electro-optical control of SHG in plasmonic slot waveguides.
    • To analyze both conventional and electrically induced SHG mechanisms.
    • To explore the potential for voltage-driven modulation of nonlinear optical processes.

    Main Methods:

    • Theoretical investigation of SHG in a plasmonic slot waveguide.
    • Inclusion of both conventional and electrically induced SHG.

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  • Simulation of moderate pump power (40 mW) at 1550 nm.
  • Analysis of nonlinear polymers integrated within the slot.

    • Main Results:

    • Voltage-dependent modulation of second-harmonic power was predicted.
    • Quadratic and linear modulation observed for centrosymmetric and noncentrosymmetric polymers, respectively.
    • High converted power (up to 140 μW) achieved over a short distance (16 μm) with 10 V.

    Conclusions:

    • Active electro-optical control of SHG in plasmonic slot waveguides is feasible.
    • This mechanism enables high-speed optical modulations.
    • Potential applications include ultrafast electrical signal detection.