k-space imaging of the eigenmodes of sharp gold tapers for scanning near-field optical microscopy
We investigate the radiation patterns of sharp conical gold tapers, which were designed as adiabatic nanofocusing probes for scanning near-field optical microscopy (SNOM). Field calculations show that only the lowest order eigenmode of such a taper can reach the very apex and thus induce the generat...
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
| Published: |
Beilstein-Institut
2013-10-01
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| Series: | Beilstein Journal of Nanotechnology |
| Subjects: | |
| Online Access: | https://doi.org/10.3762/bjnano.4.67 |
| _version_ | 1819231130829717504 |
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| author | Martin Esmann Simon F. Becker Bernard B. da Cunha Jens H. Brauer Ralf Vogelgesang Petra Groß Christoph Lienau |
| author_facet | Martin Esmann Simon F. Becker Bernard B. da Cunha Jens H. Brauer Ralf Vogelgesang Petra Groß Christoph Lienau |
| author_sort | Martin Esmann |
| collection | DOAJ |
| description | We investigate the radiation patterns of sharp conical gold tapers, which were designed as adiabatic nanofocusing probes for scanning near-field optical microscopy (SNOM). Field calculations show that only the lowest order eigenmode of such a taper can reach the very apex and thus induce the generation of strongly enhanced near-field signals. Higher-order modes are coupled into the far field at finite distances from the apex. Here, we demonstrate experimentally how to distinguish and separate between the lowest and higher-order eigenmodes of such a metallic taper by filtering in the spatial frequency domain. Our approach has the potential to considerably improve the signal-to-background ratio in spectroscopic experiments at the nanoscale. |
| first_indexed | 2024-12-23T11:40:05Z |
| format | Article |
| id | doaj.art-7d4c244521d543268c996f97b39729e6 |
| institution | Directory Open Access Journal |
| issn | 2190-4286 |
| language | English |
| last_indexed | 2024-12-23T11:40:05Z |
| publishDate | 2013-10-01 |
| publisher | Beilstein-Institut |
| record_format | Article |
| series | Beilstein Journal of Nanotechnology |
| spelling | doaj.art-7d4c244521d543268c996f97b39729e62022-12-21T17:48:31ZengBeilstein-InstitutBeilstein Journal of Nanotechnology2190-42862013-10-014160361010.3762/bjnano.4.672190-4286-4-67k-space imaging of the eigenmodes of sharp gold tapers for scanning near-field optical microscopyMartin Esmann0Simon F. Becker1Bernard B. da Cunha2Jens H. Brauer3Ralf Vogelgesang4Petra Groß5Christoph Lienau6Institut für Physik, Carl von Ossietzky Universität, 26129 Oldenburg, GermanyInstitut für Physik, Carl von Ossietzky Universität, 26129 Oldenburg, GermanyInstitut für Physik, Carl von Ossietzky Universität, 26129 Oldenburg, GermanyInstitut für Physik, Carl von Ossietzky Universität, 26129 Oldenburg, GermanyInstitut für Physik, Carl von Ossietzky Universität, 26129 Oldenburg, GermanyInstitut für Physik, Carl von Ossietzky Universität, 26129 Oldenburg, GermanyInstitut für Physik, Carl von Ossietzky Universität, 26129 Oldenburg, GermanyWe investigate the radiation patterns of sharp conical gold tapers, which were designed as adiabatic nanofocusing probes for scanning near-field optical microscopy (SNOM). Field calculations show that only the lowest order eigenmode of such a taper can reach the very apex and thus induce the generation of strongly enhanced near-field signals. Higher-order modes are coupled into the far field at finite distances from the apex. Here, we demonstrate experimentally how to distinguish and separate between the lowest and higher-order eigenmodes of such a metallic taper by filtering in the spatial frequency domain. Our approach has the potential to considerably improve the signal-to-background ratio in spectroscopic experiments at the nanoscale.https://doi.org/10.3762/bjnano.4.67adiabatic nanofocusingFourier opticsmetallic wire modesplasmonicsscanning near-field optical microscopy (SNOM) |
| spellingShingle | Martin Esmann Simon F. Becker Bernard B. da Cunha Jens H. Brauer Ralf Vogelgesang Petra Groß Christoph Lienau k-space imaging of the eigenmodes of sharp gold tapers for scanning near-field optical microscopy Beilstein Journal of Nanotechnology adiabatic nanofocusing Fourier optics metallic wire modes plasmonics scanning near-field optical microscopy (SNOM) |
| title | k-space imaging of the eigenmodes of sharp gold tapers for scanning near-field optical microscopy |
| title_full | k-space imaging of the eigenmodes of sharp gold tapers for scanning near-field optical microscopy |
| title_fullStr | k-space imaging of the eigenmodes of sharp gold tapers for scanning near-field optical microscopy |
| title_full_unstemmed | k-space imaging of the eigenmodes of sharp gold tapers for scanning near-field optical microscopy |
| title_short | k-space imaging of the eigenmodes of sharp gold tapers for scanning near-field optical microscopy |
| title_sort | k space imaging of the eigenmodes of sharp gold tapers for scanning near field optical microscopy |
| topic | adiabatic nanofocusing Fourier optics metallic wire modes plasmonics scanning near-field optical microscopy (SNOM) |
| url | https://doi.org/10.3762/bjnano.4.67 |
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