Spatial distribution of optical near-fields in plasmonic gold sphere segment voids
We present a comprehensive experimental and computational study on the electromagnetic field distribution in sphere segment void arrays. Surface plasmon polaritons can be excited in these void arrays, resulting in greatly enhanced electromagnetic fields. With the scanning near-field optical microsco...
| Authors: | ; ; ; ; ; ; |
|---|---|
| Format: | Article |
| Status: | Published version |
| Publication date: | 2013 |
| Country: | Argentina |
| Institution: | Consejo Nacional de Investigaciones Científicas y Técnicas |
| Repository: | CONICET Digital (CONICET) |
| Language: | English |
| OAI Identifier: | oai:ri.conicet.gov.ar:11336/17690 |
| Online Access: | http://hdl.handle.net/11336/17690 |
| Access Level: | Open access |
| Keyword: | Plasmones Cavidades Snom https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| _version_ | 1878403158242230272 |
|---|---|
| author | Schmidt, M. |
| author2 | Tognalli, Nicolas Gerardo Otte, M. A. Alonso, M. I. Sepúlveda, B. Fainstein, Alejandro Goñi, A. R. |
| author2_role | author author author author author author |
| author_browse | Alonso, M. I. Fainstein, Alejandro Goñi, A. R. Otte, M. A. Schmidt, M. Sepúlveda, B. Tognalli, Nicolas Gerardo |
| author_facet | Schmidt, M. Tognalli, Nicolas Gerardo Otte, M. A. Alonso, M. I. Sepúlveda, B. Fainstein, Alejandro Goñi, A. R. |
| author_role | author |
| collection | CONICET Digital (CONICET) |
| description | We present a comprehensive experimental and computational study on the electromagnetic field distribution in sphere segment void arrays. Surface plasmon polaritons can be excited in these void arrays, resulting in greatly enhanced electromagnetic fields. With the scanning near-field optical microscope (SNOM) we are able to measure the electromagnetic field distribution at the sample surface. For this purpose, an array of relatively large voids with a sphere diameter of 900 nm was fabricated, allowing for an easy access of the scanning glass-fibre tip and yielding very detailed scans. Complementary, finite-difference time-domain (FDTD) calculations on a complete void array have been performed and compared with the SNOM intensity maps and experimental reflectivity data. We show in a direct way both the existence of extended and localised modes in the Au void array for three different void depths. We also show and discuss the changes that the modes undergo for the different void depths and excitation wavelengths. Moreover, since the simulations were performed for two different void geometries, one containing perfectly spherical void surfaces and another more realistic one, which considers the presence of interstitial wall holes and other imperfections, as observed in scanning electron micrographs, we were able to determine by comparison with the experiment under which conditions an array of idealised sphere segment voids is a meaningful model. This demonstrates that both SNOM and FDTD simulations are powerful tools for understanding the plasmonic response of metallic nanostructures, thus enabling, for instance, a design for applications in ultra-sensitive optical detection. |
| eu_rights_str_mv | openAccess |
| format | article |
| id | AR_48d845f13e4e9e8cdc0a43d4a37d64da |
| identifier_str_mv | Schmidt, M.; Tognalli, Nicolas Gerardo; Otte, M. A.; Alonso, M. I.; Sepúlveda, B.; et al.; Spatial distribution of optical near-fields in plasmonic gold sphere segment voids; Springer; Plasmonics; 8; 2; 6-2013; 921-930 1557-1955 1557-1963 |
| institution | Consejo Nacional de Investigaciones Científicas y Técnicas |
| instname_str | Consejo Nacional de Investigaciones Científicas y Técnicas |
| language | eng |
| network_acronym_str | AR |
| network_name_str | Argentina |
| oai_identifier_str | oai:ri.conicet.gov.ar:11336/17690 |
| publishDate | 2013 |
| publishDateSort | 2013 |
| publisher | Springer |
| publisherStr | Springer |
| reponame_str | CONICET Digital (CONICET) |
| spelling | Spatial distribution of optical near-fields in plasmonic gold sphere segment voids Schmidt, M. Tognalli, Nicolas Gerardo Otte, M. A. Alonso, M. I. Sepúlveda, B. Fainstein, Alejandro Goñi, A. R. Plasmones Cavidades Snom https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 We present a comprehensive experimental and computational study on the electromagnetic field distribution in sphere segment void arrays. Surface plasmon polaritons can be excited in these void arrays, resulting in greatly enhanced electromagnetic fields. With the scanning near-field optical microscope (SNOM) we are able to measure the electromagnetic field distribution at the sample surface. For this purpose, an array of relatively large voids with a sphere diameter of 900 nm was fabricated, allowing for an easy access of the scanning glass-fibre tip and yielding very detailed scans. Complementary, finite-difference time-domain (FDTD) calculations on a complete void array have been performed and compared with the SNOM intensity maps and experimental reflectivity data. We show in a direct way both the existence of extended and localised modes in the Au void array for three different void depths. We also show and discuss the changes that the modes undergo for the different void depths and excitation wavelengths. Moreover, since the simulations were performed for two different void geometries, one containing perfectly spherical void surfaces and another more realistic one, which considers the presence of interstitial wall holes and other imperfections, as observed in scanning electron micrographs, we were able to determine by comparison with the experiment under which conditions an array of idealised sphere segment voids is a meaningful model. This demonstrates that both SNOM and FDTD simulations are powerful tools for understanding the plasmonic response of metallic nanostructures, thus enabling, for instance, a design for applications in ultra-sensitive optical detection. Fil: Schmidt, M.. Consejo Superior de Investigaciones Cientificas; España Fil: Tognalli, Nicolas Gerardo. Consejo Superior de Investigaciones Cientificas; España. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Otte, M. A.. Consejo Superior de Investigaciones Cientificas; España Fil: Alonso, M. I.. Consejo Superior de Investigaciones Cientificas; España Fil: Sepúlveda, B.. Consejo Superior de Investigaciones Cientificas; España Fil: Fainstein, Alejandro. Comisión Nacional de Energía Atómica. Centro Atómico Bariloche; Argentina. Consejo Nacional de Investigaciones Científicas y Técnicas; Argentina Fil: Goñi, A. R.. Consejo Superior de Investigaciones Cientificas; España. Institució Catalana de Recerca i Estudis Avancats; España Springer http://hdl.handle.net/11336/17690 Schmidt, M.; Tognalli, Nicolas Gerardo; Otte, M. A.; Alonso, M. I.; Sepúlveda, B.; et al.; Spatial distribution of optical near-fields in plasmonic gold sphere segment voids; Springer; Plasmonics; 8; 2; 6-2013; 921-930 1557-1955 1557-1963 |
| spellingShingle | Spatial distribution of optical near-fields in plasmonic gold sphere segment voids Schmidt, M. Plasmones Cavidades Snom https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| status_str | publishedVersion |
| title | Spatial distribution of optical near-fields in plasmonic gold sphere segment voids |
| title_full | Spatial distribution of optical near-fields in plasmonic gold sphere segment voids |
| title_fullStr | Spatial distribution of optical near-fields in plasmonic gold sphere segment voids |
| title_full_unstemmed | Spatial distribution of optical near-fields in plasmonic gold sphere segment voids |
| title_short | Spatial distribution of optical near-fields in plasmonic gold sphere segment voids |
| title_sort | Spatial distribution of optical near-fields in plasmonic gold sphere segment voids |
| topic | Plasmones Cavidades Snom https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| topic_facet | Plasmones Cavidades Snom https://purl.org/becyt/ford/1.3 https://purl.org/becyt/ford/1 |
| url | http://hdl.handle.net/11336/17690 |