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Related Experiment Video

Updated: Apr 3, 2026

Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Spaser operation below threshold: autonomous vs. driven spasers.

E S Andrianov, A A Pukhov, A V Dorofeenko

    Optics Express
    |September 15, 2015
    PubMed
    Summary
    This summary is machine-generated.

    Achieving spasing requires high pump rates due to low Q-factors in spasers. Loss compensation with an external optical wave dramatically boosts coherent plasmons and suppresses quantum noise at achievable rates.

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    Area of Science:

    • Plasmonics
    • Quantum Optics
    • Nanophotonics

    Background:

    • Spasers (surface plasmon amplification by stimulated emission of radiation) are nanoscale light sources.
    • High Joule losses in metal nanoparticles lead to low Q-factors, necessitating high pump rates for spasing.
    • Achieving the spasing regime, where coherent plasmons dominate, is challenging due to these limitations.

    Purpose of the Study:

    • To investigate methods for enhancing coherent plasmon generation in spasers.
    • To explore the effect of external optical wave-driven loss compensation on spaser performance.
    • To determine if achievable pump rates can yield significant coherent plasmon populations.

    Main Methods:

    • Theoretical analysis of spaser dynamics under external optical driving.
    • Modeling of loss compensation mechanisms near the spasing threshold.
    • Quantification of coherent and incoherent plasmon populations and quantum noise levels.

    Main Results:

    • Loss compensation by an external optical wave dramatically increases the number of coherent plasmons.
    • Quantum noise is significantly suppressed under these conditions.
    • Coherent plasmon populations exceeding spontaneously excited ones are achievable at practical pump rates.

    Conclusions:

    • External optical wave-driven loss compensation is an effective strategy to improve spaser performance.
    • This method overcomes the limitations imposed by low Q-factors and high pump rate requirements.
    • Enhanced coherent plasmon generation and noise suppression pave the way for more efficient spaser operation.