dorsal/arxiv
View SchemaSpectroscopic properties of a two-level atom interacting with a complex spherical nanoshell
| Authors | Alexander Moroz |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0412094 |
| URL | https://arxiv.org/abs/quant-ph/0412094 |
| DOI | 10.1016/j.chemphys.2005.05.003 |
| Journal | Chemical Physics 317(1), 1-15 (2005) |
Abstract
Frequency shifts, radiative decay rates, the Ohmic loss contribution to the nonradiative decay rates, fluorescence yields, and photobleaching of a two-level atom radiating anywhere inside or outside a complex spherical nanoshell, i.e. a stratified sphere consisting of alternating silica and gold concentric spherical shells, are studied. The changes in the spectroscopic properties of an atom interacting with complex nanoshells are significantly enhanced, often more than two orders of magnitude, compared to the same atom interacting with a homogeneous dielectric sphere. The detected fluorescence intensity can be enhanced by 5 or more orders of magnitude. The changes strongly depend on the nanoshell parameters and the atom position. When an atom approaches a metal shell, decay rates are strongly enhanced yet fluorescence exhibits a well-known quenching. Rather contra-intuitively, the Ohmic loss contribution to the nonradiative decay rates for an atomic dipole within the silica core of larger nanoshells may be decreasing when the silica core - inner gold shell interface is approached. The quasistatic result that the radial frequency shift in a close proximity of a spherical shell interface is approximately twice as large as the tangential frequency shift appears to apply also for complex nanoshells. Significantly modified spectroscopic properties (see computer program (pending publication of this manuscript) freely available at http://www.wave-scattering.com) can be observed in a broad band comprising all (nonresonant) optical and near-infrared wavelengths.
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"abstract": "Frequency shifts, radiative decay rates, the Ohmic loss contribution to the\nnonradiative decay rates, fluorescence yields, and photobleaching of a\ntwo-level atom radiating anywhere inside or outside a complex spherical\nnanoshell, i.e. a stratified sphere consisting of alternating silica and gold\nconcentric spherical shells, are studied. The changes in the spectroscopic\nproperties of an atom interacting with complex nanoshells are significantly\nenhanced, often more than two orders of magnitude, compared to the same atom\ninteracting with a homogeneous dielectric sphere. The detected fluorescence\nintensity can be enhanced by 5 or more orders of magnitude. The changes\nstrongly depend on the nanoshell parameters and the atom position. When an atom\napproaches a metal shell, decay rates are strongly enhanced yet fluorescence\nexhibits a well-known quenching. Rather contra-intuitively, the Ohmic loss\ncontribution to the nonradiative decay rates for an atomic dipole within the\nsilica core of larger nanoshells may be decreasing when the silica core - inner\ngold shell interface is approached. The quasistatic result that the radial\nfrequency shift in a close proximity of a spherical shell interface is\napproximately twice as large as the tangential frequency shift appears to apply\nalso for complex nanoshells. Significantly modified spectroscopic properties\n(see computer program (pending publication of this manuscript) freely available\nat http://www.wave-scattering.com) can be observed in a broad band comprising\nall (nonresonant) optical and near-infrared wavelengths.",
"arxiv_id": "quant-ph/0412094",
"authors": [
"Alexander Moroz"
],
"categories": [
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"doi": "10.1016/j.chemphys.2005.05.003",
"journal_ref": "Chemical Physics 317(1), 1-15 (2005)",
"title": "Spectroscopic properties of a two-level atom interacting with a complex spherical nanoshell",
"url": "https://arxiv.org/abs/quant-ph/0412094"
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