Dye-doped spheres with plasmonic semi-shells: Lasing modes and scattering at realistic gain levels
We numerically simulate the compensation of absorption, the near-field enhancement as well as the differential far-field scattering cross section for dye-doped polystyrene spheres (radius 195 nm), which are half-covered by a silver layer of 10–40 nm thickness. Such silver capped spheres are interest...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Beilstein-Institut
2013-12-01
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| Series: | Beilstein Journal of Nanotechnology |
| Subjects: | |
| Online Access: | https://doi.org/10.3762/bjnano.4.110 |
| _version_ | 1818249478782582784 |
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| author | Nikita Arnold Boyang Ding Calin Hrelescu Thomas A. Klar |
| author_facet | Nikita Arnold Boyang Ding Calin Hrelescu Thomas A. Klar |
| author_sort | Nikita Arnold |
| collection | DOAJ |
| description | We numerically simulate the compensation of absorption, the near-field enhancement as well as the differential far-field scattering cross section for dye-doped polystyrene spheres (radius 195 nm), which are half-covered by a silver layer of 10–40 nm thickness. Such silver capped spheres are interesting candidates for nanoplasmonic lasers, so-called spasers. We find that spasing requires gain levels less than 3.7 times higher than those in commercially available dye-doped spheres. However, commercially available concentrations are already apt to achieve negative absorption, and to narrow and enhance scattering by higher order modes. Narrowing of the plasmonic modes by gain also makes visible higher order modes, which are normally obscured by the broad spectral features of the lower order modes. We further show that the angular distribution of the far-field scattering of the spasing modes is by no means dipole-like and is very sensitive to the geometry of the structure. |
| first_indexed | 2024-12-12T15:37:08Z |
| format | Article |
| id | doaj.art-31baf956ba8549dfbc60867e49a3e881 |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-12-12T15:37:08Z |
| publishDate | 2013-12-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-31baf956ba8549dfbc60867e49a3e8812022-12-22T00:19:58ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862013-12-014197498710.3762/bjnano.4.1102190-4286-4-110Dye-doped spheres with plasmonic semi-shells: Lasing modes and scattering at realistic gain levelsNikita Arnold0Boyang Ding1Calin Hrelescu2Thomas A. Klar3Institute of Applied Physics, Johannes Kepler University, 4040 Linz, AustriaInstitute of Applied Physics, Johannes Kepler University, 4040 Linz, AustriaInstitute of Applied Physics, Johannes Kepler University, 4040 Linz, AustriaInstitute of Applied Physics, Johannes Kepler University, 4040 Linz, AustriaWe numerically simulate the compensation of absorption, the near-field enhancement as well as the differential far-field scattering cross section for dye-doped polystyrene spheres (radius 195 nm), which are half-covered by a silver layer of 10–40 nm thickness. Such silver capped spheres are interesting candidates for nanoplasmonic lasers, so-called spasers. We find that spasing requires gain levels less than 3.7 times higher than those in commercially available dye-doped spheres. However, commercially available concentrations are already apt to achieve negative absorption, and to narrow and enhance scattering by higher order modes. Narrowing of the plasmonic modes by gain also makes visible higher order modes, which are normally obscured by the broad spectral features of the lower order modes. We further show that the angular distribution of the far-field scattering of the spasing modes is by no means dipole-like and is very sensitive to the geometry of the structure.https://doi.org/10.3762/bjnano.4.110gainmetamaterialsnanophotonicsplasmonicsspaser |
| spellingShingle | Nikita Arnold Boyang Ding Calin Hrelescu Thomas A. Klar Dye-doped spheres with plasmonic semi-shells: Lasing modes and scattering at realistic gain levels Beilstein Journal of Nanotechnology gain metamaterials nanophotonics plasmonics spaser |
| title | Dye-doped spheres with plasmonic semi-shells: Lasing modes and scattering at realistic gain levels |
| title_full | Dye-doped spheres with plasmonic semi-shells: Lasing modes and scattering at realistic gain levels |
| title_fullStr | Dye-doped spheres with plasmonic semi-shells: Lasing modes and scattering at realistic gain levels |
| title_full_unstemmed | Dye-doped spheres with plasmonic semi-shells: Lasing modes and scattering at realistic gain levels |
| title_short | Dye-doped spheres with plasmonic semi-shells: Lasing modes and scattering at realistic gain levels |
| title_sort | dye doped spheres with plasmonic semi shells lasing modes and scattering at realistic gain levels |
| topic | gain metamaterials nanophotonics plasmonics spaser |
| url | https://doi.org/10.3762/bjnano.4.110 |
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