Perturbations of Dipole Decay Dynamics Induced by Plasmonic Nano-antennas – A Study within the Discrete Dipole Approximation
We report a discrete dipole approximation approach to analyse the perturbations induced by silver nano-particles on the decay dynamics of a point-like emitter placed in their proximity. Due to the excitation of localized surface plasmons, metallic nano-particles behave like optical antennas and are...
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| Format: | Article |
| Language: | English |
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Hindawi - SAGE Publishing
2015-04-01
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| Series: | Nanomaterials and Nanotechnology |
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| Online Access: | http://www.intechopen.com/journals/nanomaterials_and_nanotechnology/perturbations-of-dipole-decay-dynamics-induced-by-plasmonic-nano-antennas-ndash-a-study-within-the-d |
| _version_ | 1797423178025271296 |
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| author | Stefania D'Agostino Fabio Della Sala Lucio Claudio Andreani |
| author_facet | Stefania D'Agostino Fabio Della Sala Lucio Claudio Andreani |
| author_sort | Stefania D'Agostino |
| collection | DOAJ |
| description | We report a discrete dipole approximation approach to analyse the perturbations induced by silver nano-particles on the decay dynamics of a point-like emitter placed in their proximity. Due to the excitation of localized surface plasmons, metallic nano-particles behave like optical antennas and are able to convert localized fields into free- propagating optical radiation, and vice versa. Field localization and enhancement induce strong changes on the decay dynamics of dipoles located in the perturbed electromagnetic environment, and these can be faithfully quantified within the framework of classical electromag‐ netism in terms of total, radiative and non-radiative decay rates. The method is tested on benchmark cases, i.e., nano- spheres and nano-shells, and it is then applied to analyti‐ cally-unsolvable shapes such as sharp nano-cones and oxide-covered small nano-antennas. Numerical results reveal 105-order enhancements in the total decay rate of the dipole when located very near to the sharp tip, both with and without a thin Ag2O layer. Moreover, the counter- intuitive behaviour of the cone response in relation to the
distance between the metal and the source of the radiation is discussed. Applications span from strong coupling studies to time-resolved fluorescence spectroscopy. |
| first_indexed | 2024-03-09T07:42:41Z |
| format | Article |
| id | doaj.art-e3ea3db68b4f448483a8faa4eacbd0f3 |
| institution | Directory Open Access Journal |
| issn | 1847-9804 |
| language | English |
| last_indexed | 2024-03-09T07:42:41Z |
| publishDate | 2015-04-01 |
| publisher | Hindawi - SAGE Publishing |
| record_format | Article |
| series | Nanomaterials and Nanotechnology |
| spelling | doaj.art-e3ea3db68b4f448483a8faa4eacbd0f32023-12-03T04:20:38ZengHindawi - SAGE PublishingNanomaterials and Nanotechnology1847-98042015-04-01511http://dx.doi.org/10.5772/6056648367Perturbations of Dipole Decay Dynamics Induced by Plasmonic Nano-antennas – A Study within the Discrete Dipole ApproximationStefania D'AgostinoFabio Della SalaLucio Claudio AndreaniWe report a discrete dipole approximation approach to analyse the perturbations induced by silver nano-particles on the decay dynamics of a point-like emitter placed in their proximity. Due to the excitation of localized surface plasmons, metallic nano-particles behave like optical antennas and are able to convert localized fields into free- propagating optical radiation, and vice versa. Field localization and enhancement induce strong changes on the decay dynamics of dipoles located in the perturbed electromagnetic environment, and these can be faithfully quantified within the framework of classical electromag‐ netism in terms of total, radiative and non-radiative decay rates. The method is tested on benchmark cases, i.e., nano- spheres and nano-shells, and it is then applied to analyti‐ cally-unsolvable shapes such as sharp nano-cones and oxide-covered small nano-antennas. Numerical results reveal 105-order enhancements in the total decay rate of the dipole when located very near to the sharp tip, both with and without a thin Ag2O layer. Moreover, the counter- intuitive behaviour of the cone response in relation to the distance between the metal and the source of the radiation is discussed. Applications span from strong coupling studies to time-resolved fluorescence spectroscopy.http://www.intechopen.com/journals/nanomaterials_and_nanotechnology/perturbations-of-dipole-decay-dynamics-induced-by-plasmonic-nano-antennas-ndash-a-study-within-the-dDiscrete Dipole ApproximationOptical AntennasLocalized PlasmonsDipole Decay Dynamics |
| spellingShingle | Stefania D'Agostino Fabio Della Sala Lucio Claudio Andreani Perturbations of Dipole Decay Dynamics Induced by Plasmonic Nano-antennas – A Study within the Discrete Dipole Approximation Nanomaterials and Nanotechnology Discrete Dipole Approximation Optical Antennas Localized Plasmons Dipole Decay Dynamics |
| title | Perturbations of Dipole Decay Dynamics Induced by Plasmonic Nano-antennas – A Study within the Discrete Dipole Approximation |
| title_full | Perturbations of Dipole Decay Dynamics Induced by Plasmonic Nano-antennas – A Study within the Discrete Dipole Approximation |
| title_fullStr | Perturbations of Dipole Decay Dynamics Induced by Plasmonic Nano-antennas – A Study within the Discrete Dipole Approximation |
| title_full_unstemmed | Perturbations of Dipole Decay Dynamics Induced by Plasmonic Nano-antennas – A Study within the Discrete Dipole Approximation |
| title_short | Perturbations of Dipole Decay Dynamics Induced by Plasmonic Nano-antennas – A Study within the Discrete Dipole Approximation |
| title_sort | perturbations of dipole decay dynamics induced by plasmonic nano antennas a study within the discrete dipole approximation |
| topic | Discrete Dipole Approximation Optical Antennas Localized Plasmons Dipole Decay Dynamics |
| url | http://www.intechopen.com/journals/nanomaterials_and_nanotechnology/perturbations-of-dipole-decay-dynamics-induced-by-plasmonic-nano-antennas-ndash-a-study-within-the-d |
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