Abstract
The electric field and radiated power of a radiating dipole located inside a spherical nano-cavity are formulated to show that the nano-cavity structure or nanoscale-cavity effect can enhance the near-field intensity inside the cavity and the far-field radiated power of the dipole. Such enhancements are caused by two contributing factors, including the classical electromagnetic scattering as formulated and the Purcell effect, which is implemented through a numerical feedback process by assuming a two-level system for the radiating dipole. The enhancement of near-field intensity results in the efficiency increase of Förster resonance energy transfer when both energy donor and acceptor are located inside the nano-cavity. By combining the enhancements of the field intensity of the donor and the radiated power of the acceptor, the color conversion efficiency can be increased through the nanoscale-cavity effect. We also numerically demonstrate that the nanoscale-cavity effect can enhance surface plasmon coupling for increasing the radiated power of a dipole located nearby an Ag nanoparticle inside a nano-cavity.
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Funding
This research was funded by the Ministry of Science and Technology, Taiwan, the Republic of China, under the grant of MOST 111-2221-E-002-073 and MOST 110-2221-E-002-131.
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Yang Kuo: formulation and numerical algorithm preparation, numerical computations; C. C. (Chih-Chung) Yang: concept proposing, data interpretations, writing.
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Kuo, Y., Yang, C.CC. Theoretical/Numerical Studies of the Nanoscale-Cavity Effects on Dipole Emission, Förster Resonance Energy Transfer, and Surface Plasmon Coupling. Plasmonics 19, 273–285 (2024). https://doi.org/10.1007/s11468-023-01991-x
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DOI: https://doi.org/10.1007/s11468-023-01991-x