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Antiboding and bonding lasing modes with low gain threshold in nonlocal metallic nanoshell.

Y Huang, J J Xiao, L Gao

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    We explored spaser generation conditions for ultrasmall plasmonic nanolasers. Two distinct lasing states were identified, offering flexibility in designing efficient nanoparticle lasers.

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    Area of Science:

    • Plasmonics
    • Nanophotonics
    • Quantum Optics

    Background:

    • Spaser generation in compact nanolasers is crucial for advanced optical devices.
    • Core-shell nanoparticles offer unique plasmonic properties for nanolaser applications.
    • Understanding nonlocal effects is essential for accurate modeling of nanoscale phenomena.

    Purpose of the Study:

    • To establish the spaser generation condition for dielectric-metal core-shell nanoparticles.
    • To investigate the hybridized antibonding and bonding modes in coated nanolasers.
    • To analyze the influence of nonlocal effects on lasing properties.

    Main Methods:

    • Full-wave nonlocal Mie theory was employed.
    • Analysis of dielectric-metal core-shell nanoparticles in the long-wavelength limit.
    • Numerical simulations to study lasing states and gain thresholds.

    Main Results:

    • Two distinct lasing states, arising from hybridized antibonding and bonding modes, were identified.
    • Low gain thresholds were achievable by tuning the surrounding medium, gain materials, and radii ratios.
    • Nonlocal effects were found to differently influence the gain threshold and refractive index of the two modes.

    Conclusions:

    • The study provides a theoretical framework for designing compact plasmonic nanolasers.
    • Flexible control over lasing properties is possible by manipulating material and structural parameters.
    • Nonlocal effects play a significant role and must be considered in the design of ultrasmall nanoparticle lasers.