Optimal plasmonic focusing on a metal disc under radially polarized terahertz illumination
Optimal focusing of surface plasmon polaritons in the center of a metal disc illuminated by radially polarized terahertz pulses is demonstrated. By matching the cylindrical symmetry of the metal structure with the radially polarized terahertz field, surface plasmons are excited along its entire circ...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
IOP Publishing
2013-01-01
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| Series: | New Journal of Physics |
| Online Access: | https://doi.org/10.1088/1367-2630/15/7/075005 |
| _version_ | 1827874133310963712 |
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| author | Stefan Waselikowski Christian Fischer Jan Wallauer Markus Walther |
| author_facet | Stefan Waselikowski Christian Fischer Jan Wallauer Markus Walther |
| author_sort | Stefan Waselikowski |
| collection | DOAJ |
| description | Optimal focusing of surface plasmon polaritons in the center of a metal disc illuminated by radially polarized terahertz pulses is demonstrated. By matching the cylindrical symmetry of the metal structure with the radially polarized terahertz field, surface plasmons are excited along its entire circumference. Constructive interference in the disc center produces a sharp frequency-dependent focal spot well described by a zero-order Bessel function. We map the field distributions on the disc by terahertz (THz) near-field microscopy and compare our results with numerical simulations. For comparison, the behavior of the plasmonic lens under linearly polarized THz illumination is also characterized. The remarkable focusing capabilities of such a plasmonic lens together with its simple structure offer considerable potential for THz sensing and imaging applications. |
| first_indexed | 2024-03-12T16:47:51Z |
| format | Article |
| id | doaj.art-ae06adecf6f84f2981ac35d941a87837 |
| institution | Directory Open Access Journal |
| issn | 1367-2630 |
| language | English |
| last_indexed | 2024-03-12T16:47:51Z |
| publishDate | 2013-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | New Journal of Physics |
| spelling | doaj.art-ae06adecf6f84f2981ac35d941a878372023-08-08T11:28:38ZengIOP PublishingNew Journal of Physics1367-26302013-01-0115707500510.1088/1367-2630/15/7/075005Optimal plasmonic focusing on a metal disc under radially polarized terahertz illuminationStefan Waselikowski0Christian Fischer1Jan Wallauer2Markus Walther3Freiburg Materials Research Center, University of Freiburg , Stefan-Meier-Strasse 21, D-79104 Freiburg, Germany; Department of Molecular and Optical Physics, University of Freiburg , Stefan-Meier-Strasse 19, D-79104 Freiburg, GermanyDepartment of Molecular and Optical Physics, University of Freiburg , Stefan-Meier-Strasse 19, D-79104 Freiburg, GermanyFreiburg Materials Research Center, University of Freiburg , Stefan-Meier-Strasse 21, D-79104 Freiburg, Germany; Department of Molecular and Optical Physics, University of Freiburg , Stefan-Meier-Strasse 19, D-79104 Freiburg, GermanyFreiburg Materials Research Center, University of Freiburg , Stefan-Meier-Strasse 21, D-79104 Freiburg, Germany; Department of Molecular and Optical Physics, University of Freiburg , Stefan-Meier-Strasse 19, D-79104 Freiburg, GermanyOptimal focusing of surface plasmon polaritons in the center of a metal disc illuminated by radially polarized terahertz pulses is demonstrated. By matching the cylindrical symmetry of the metal structure with the radially polarized terahertz field, surface plasmons are excited along its entire circumference. Constructive interference in the disc center produces a sharp frequency-dependent focal spot well described by a zero-order Bessel function. We map the field distributions on the disc by terahertz (THz) near-field microscopy and compare our results with numerical simulations. For comparison, the behavior of the plasmonic lens under linearly polarized THz illumination is also characterized. The remarkable focusing capabilities of such a plasmonic lens together with its simple structure offer considerable potential for THz sensing and imaging applications.https://doi.org/10.1088/1367-2630/15/7/075005 |
| spellingShingle | Stefan Waselikowski Christian Fischer Jan Wallauer Markus Walther Optimal plasmonic focusing on a metal disc under radially polarized terahertz illumination New Journal of Physics |
| title | Optimal plasmonic focusing on a metal disc under radially polarized terahertz illumination |
| title_full | Optimal plasmonic focusing on a metal disc under radially polarized terahertz illumination |
| title_fullStr | Optimal plasmonic focusing on a metal disc under radially polarized terahertz illumination |
| title_full_unstemmed | Optimal plasmonic focusing on a metal disc under radially polarized terahertz illumination |
| title_short | Optimal plasmonic focusing on a metal disc under radially polarized terahertz illumination |
| title_sort | optimal plasmonic focusing on a metal disc under radially polarized terahertz illumination |
| url | https://doi.org/10.1088/1367-2630/15/7/075005 |
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