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Related Concept Videos

Induced Electric Dipoles01:28

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A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
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Single dipole evanescently coupled to a multimode waveguide.

N R Verhart, G Lepert, A L Billing

    Optics Express
    |October 17, 2014
    PubMed
    Summary
    This summary is machine-generated.

    We studied how a single dipole couples to a multimode waveguide. Increasing waveguide size affects emission rates by opening new decay channels, crucial for designing single photon sources.

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    Area of Science:

    • Optics and Photonics
    • Quantum Optics
    • Nanophotonics

    Background:

    • Single photon sources are essential for quantum technologies.
    • Waveguide-integrated quantum emitters offer enhanced control and scalability.
    • Understanding light-matter interaction in nanophotonic structures is key.

    Purpose of the Study:

    • To investigate the emission rate of a single dipole coupled to a cylindrical multimode waveguide.
    • To analyze the influence of waveguide diameter and dipole orientation on emission.
    • To provide design insights for waveguide-based single photon sources.

    Main Methods:

    • Analytical calculation of emission rates.
    • Evanescent coupling model for a single dipole.
    • Finite-difference time-domain (FDTD) simulations for validation.

    Main Results:

    • Emission rate is dependent on waveguide diameter and dipole orientation.
    • Increasing waveguide radius decreases coupling to lower-order modes.
    • Higher-order modes become accessible decay channels as radius increases, enhancing the density of states.

    Conclusions:

    • Waveguide geometry significantly impacts single emitter emission dynamics.
    • Exploiting the superposition of transverse modes is a viable strategy for designing efficient single photon sources.
    • This work informs the development of advanced integrated quantum photonic devices.