An Inverted Honeycomb Plasmonic Lattice as an Efficient Refractive Index Sensor
We present an efficient refractive index sensor consisting of a heterostructure that contains an Au inverted honeycomb lattice as a main sensing element. Our design aims at maximizing the out-of-plane near-field distributions of the collective modes of the lattice mapping the sensor surroundings. Th...
| প্রধান লেখক: | , , , , , , , |
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| বিন্যাস: | প্রবন্ধ |
| ভাষা: | English |
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MDPI AG
2021-05-01
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| মালা: | Nanomaterials |
| বিষয়গুলি: | |
| অনলাইন ব্যবহার করুন: | https://www.mdpi.com/2079-4991/11/5/1217 |
| _version_ | 1827693334282371072 |
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| author | Javier Rodríguez-Álvarez Lorenzo Gnoatto Marc Martínez-Castells Albert Guerrero Xavier Borrisé Arantxa Fraile Rodríguez Xavier Batlle Amílcar Labarta |
| author_facet | Javier Rodríguez-Álvarez Lorenzo Gnoatto Marc Martínez-Castells Albert Guerrero Xavier Borrisé Arantxa Fraile Rodríguez Xavier Batlle Amílcar Labarta |
| author_sort | Javier Rodríguez-Álvarez |
| collection | DOAJ |
| description | We present an efficient refractive index sensor consisting of a heterostructure that contains an Au inverted honeycomb lattice as a main sensing element. Our design aims at maximizing the out-of-plane near-field distributions of the collective modes of the lattice mapping the sensor surroundings. These modes are further enhanced by a patterned SiO<sub>2</sub> layer with the same inverted honeycomb lattice, an SiO<sub>2</sub> spacer, and an Au mirror underneath the Au sensing layer that contribute to achieving a high performance. The optical response of the heterostructure was studied by numerical simulation. The results corresponding to one of the collective modes showed high sensitivity values ranging from 99 to 395 nm/RIU for relatively thin layers of test materials within 50 and 200 nm. In addition, the figure of merit of the sensor detecting slight changes of the refractive index of a water medium at a fixed wavelength was as high as 199 RIU<sup>−1</sup>. As an experimental proof of concept, the heterostructure was manufactured by a simple method based on electron beam lithography and the measured optical response reproduces the simulations. This work paves the way for improving both the sensitivity of plasmonic sensors and the signal of some enhanced surface spectroscopies. |
| first_indexed | 2024-03-10T11:42:11Z |
| format | Article |
| id | doaj.art-35100af1224a4594a2e5e1248c893236 |
| institution | Directory Open Access Journal |
| issn | 2079-4991 |
| language | English |
| last_indexed | 2024-03-10T11:42:11Z |
| publishDate | 2021-05-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Nanomaterials |
| spelling | doaj.art-35100af1224a4594a2e5e1248c8932362023-11-21T18:23:23ZengMDPI AGNanomaterials2079-49912021-05-01115121710.3390/nano11051217An Inverted Honeycomb Plasmonic Lattice as an Efficient Refractive Index SensorJavier Rodríguez-Álvarez0Lorenzo Gnoatto1Marc Martínez-Castells2Albert Guerrero3Xavier Borrisé4Arantxa Fraile Rodríguez5Xavier Batlle6Amílcar Labarta7Departament de Física de la Matèria Condensada, Universitat de Barcelona, 08028 Barcelona, SpainDepartament de Física de la Matèria Condensada, Universitat de Barcelona, 08028 Barcelona, SpainDepartament de Física de la Matèria Condensada, Universitat de Barcelona, 08028 Barcelona, SpainInstitut de Microelectrónica de Barcelona (IMB-CNM, CSIC), 08193 Bellaterra, SpainCatalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and The Barcelona Institute of Science and Technology, Campus UAB, Bellaterra, 08193 Barcelona, SpainDepartament de Física de la Matèria Condensada, Universitat de Barcelona, 08028 Barcelona, SpainDepartament de Física de la Matèria Condensada, Universitat de Barcelona, 08028 Barcelona, SpainDepartament de Física de la Matèria Condensada, Universitat de Barcelona, 08028 Barcelona, SpainWe present an efficient refractive index sensor consisting of a heterostructure that contains an Au inverted honeycomb lattice as a main sensing element. Our design aims at maximizing the out-of-plane near-field distributions of the collective modes of the lattice mapping the sensor surroundings. These modes are further enhanced by a patterned SiO<sub>2</sub> layer with the same inverted honeycomb lattice, an SiO<sub>2</sub> spacer, and an Au mirror underneath the Au sensing layer that contribute to achieving a high performance. The optical response of the heterostructure was studied by numerical simulation. The results corresponding to one of the collective modes showed high sensitivity values ranging from 99 to 395 nm/RIU for relatively thin layers of test materials within 50 and 200 nm. In addition, the figure of merit of the sensor detecting slight changes of the refractive index of a water medium at a fixed wavelength was as high as 199 RIU<sup>−1</sup>. As an experimental proof of concept, the heterostructure was manufactured by a simple method based on electron beam lithography and the measured optical response reproduces the simulations. This work paves the way for improving both the sensitivity of plasmonic sensors and the signal of some enhanced surface spectroscopies.https://www.mdpi.com/2079-4991/11/5/1217Au plasmonic nanostructuresinverted honeycomb latticesurface lattice resonancesrefractive index sensor |
| spellingShingle | Javier Rodríguez-Álvarez Lorenzo Gnoatto Marc Martínez-Castells Albert Guerrero Xavier Borrisé Arantxa Fraile Rodríguez Xavier Batlle Amílcar Labarta An Inverted Honeycomb Plasmonic Lattice as an Efficient Refractive Index Sensor Nanomaterials Au plasmonic nanostructures inverted honeycomb lattice surface lattice resonances refractive index sensor |
| title | An Inverted Honeycomb Plasmonic Lattice as an Efficient Refractive Index Sensor |
| title_full | An Inverted Honeycomb Plasmonic Lattice as an Efficient Refractive Index Sensor |
| title_fullStr | An Inverted Honeycomb Plasmonic Lattice as an Efficient Refractive Index Sensor |
| title_full_unstemmed | An Inverted Honeycomb Plasmonic Lattice as an Efficient Refractive Index Sensor |
| title_short | An Inverted Honeycomb Plasmonic Lattice as an Efficient Refractive Index Sensor |
| title_sort | inverted honeycomb plasmonic lattice as an efficient refractive index sensor |
| topic | Au plasmonic nanostructures inverted honeycomb lattice surface lattice resonances refractive index sensor |
| url | https://www.mdpi.com/2079-4991/11/5/1217 |
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