Spatial Confinement of the Electrical Field Affected by Quantum Effects in Plasmonic Dimer Sandwiching a Single Molecule
The spatial confinement of the tip-induced plasmon is a critical factor to determine the resolution of the tip-enhanced Raman spectroscopy (TERS) system. Despite the compressed optical field, only 1 nm is obtained by the self-interaction effect of molecule; however, the deeper physical laws underlyi...
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IEEE
2016-01-01
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| Series: | IEEE Photonics Journal |
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| author | Xiaoming Li Hui Fang Xiaocong Yuan |
| author_facet | Xiaoming Li Hui Fang Xiaocong Yuan |
| author_sort | Xiaoming Li |
| collection | DOAJ |
| description | The spatial confinement of the tip-induced plasmon is a critical factor to determine the resolution of the tip-enhanced Raman spectroscopy (TERS) system. Despite the compressed optical field, only 1 nm is obtained by the self-interaction effect of molecule; however, the deeper physical laws underlying are still under discussion. In addition, due to the gap between the tip and the substrate is only a few nanometers (or less), the quantum effects should be taken into account. For simplicity, we treat the system of the plasmonic dimer with a molecule in the gap as a TERS-like system. In the framework of the newly developed quantum hydrodynamic model, we propose a model to study the light field enhancement and compression affected by the quantum effects in TERS-like system. The results show that the “hot spot” size depends on both the shape and the boundary location of the molecule in the dimer gap. The mechanism of such light field distribution will make us distinguish the boundary of the molecule more clearly. Therefore, our theoretical model offers a new insight into the confinement of the electromagnetic field in the TERS-like system, hence, the physical mechanism of the subnanometer spatial resolution in TERS system. |
| format | Article |
| id | doaj-art-2f8927a4b44e4a05abf421d65e786e60 |
| institution | OA Journals |
| issn | 1943-0655 |
| language | English |
| publishDate | 2016-01-01 |
| publisher | IEEE |
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| series | IEEE Photonics Journal |
| spelling | doaj-art-2f8927a4b44e4a05abf421d65e786e602025-08-20T02:38:02ZengIEEEIEEE Photonics Journal1943-06552016-01-01861910.1109/JPHOT.2016.26314027762103Spatial Confinement of the Electrical Field Affected by Quantum Effects in Plasmonic Dimer Sandwiching a Single MoleculeXiaoming Li0Hui Fang1Xiaocong Yuan2Nanophotonics Research Centre, Key Laboratory of Optoelectronic Devices and Systems, Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, ChinaNanophotonics Research Centre, Key Laboratory of Optoelectronic Devices and Systems, Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, ChinaNanophotonics Research Centre, Key Laboratory of Optoelectronic Devices and Systems, Ministry of Education and Guangdong Province, College of Optoelectronic Engineering, Shenzhen University, Shenzhen, ChinaThe spatial confinement of the tip-induced plasmon is a critical factor to determine the resolution of the tip-enhanced Raman spectroscopy (TERS) system. Despite the compressed optical field, only 1 nm is obtained by the self-interaction effect of molecule; however, the deeper physical laws underlying are still under discussion. In addition, due to the gap between the tip and the substrate is only a few nanometers (or less), the quantum effects should be taken into account. For simplicity, we treat the system of the plasmonic dimer with a molecule in the gap as a TERS-like system. In the framework of the newly developed quantum hydrodynamic model, we propose a model to study the light field enhancement and compression affected by the quantum effects in TERS-like system. The results show that the “hot spot” size depends on both the shape and the boundary location of the molecule in the dimer gap. The mechanism of such light field distribution will make us distinguish the boundary of the molecule more clearly. Therefore, our theoretical model offers a new insight into the confinement of the electromagnetic field in the TERS-like system, hence, the physical mechanism of the subnanometer spatial resolution in TERS system.https://ieeexplore.ieee.org/document/7762103/Polarizationsurface plasmonsplasmonics |
| spellingShingle | Xiaoming Li Hui Fang Xiaocong Yuan Spatial Confinement of the Electrical Field Affected by Quantum Effects in Plasmonic Dimer Sandwiching a Single Molecule IEEE Photonics Journal Polarization surface plasmons plasmonics |
| title | Spatial Confinement of the Electrical Field Affected by Quantum Effects in Plasmonic Dimer Sandwiching a Single Molecule |
| title_full | Spatial Confinement of the Electrical Field Affected by Quantum Effects in Plasmonic Dimer Sandwiching a Single Molecule |
| title_fullStr | Spatial Confinement of the Electrical Field Affected by Quantum Effects in Plasmonic Dimer Sandwiching a Single Molecule |
| title_full_unstemmed | Spatial Confinement of the Electrical Field Affected by Quantum Effects in Plasmonic Dimer Sandwiching a Single Molecule |
| title_short | Spatial Confinement of the Electrical Field Affected by Quantum Effects in Plasmonic Dimer Sandwiching a Single Molecule |
| title_sort | spatial confinement of the electrical field affected by quantum effects in plasmonic dimer sandwiching a single molecule |
| topic | Polarization surface plasmons plasmonics |
| url | https://ieeexplore.ieee.org/document/7762103/ |
| work_keys_str_mv | AT xiaomingli spatialconfinementoftheelectricalfieldaffectedbyquantumeffectsinplasmonicdimersandwichingasinglemolecule AT huifang spatialconfinementoftheelectricalfieldaffectedbyquantumeffectsinplasmonicdimersandwichingasinglemolecule AT xiaocongyuan spatialconfinementoftheelectricalfieldaffectedbyquantumeffectsinplasmonicdimersandwichingasinglemolecule |