Ultrahigh Enhancement Factor by Using a Silver Nanoshell With a Gain Core Above a Silver Substrate for Surface-Enhanced Raman Scattering at the Single-Molecule Level
Single-molecule surface-enhanced Raman scattering (SERS) has been extensively studied over the past decade. In this paper, we propose a novel method to obtain ultrahigh enhancement of local electric fields by using a silver nanoshell with a gain core above a silver substrate. Numerical results show...
| Hoofdauteurs: | , , , , , , , |
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| Formaat: | Artikel |
| Taal: | English |
| Gepubliceerd in: |
IEEE
2015-01-01
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| Reeks: | IEEE Photonics Journal |
| Onderwerpen: | |
| Online toegang: | https://ieeexplore.ieee.org/document/7274640/ |
| Samenvatting: | Single-molecule surface-enhanced Raman scattering (SERS) has been extensively studied over the past decade. In this paper, we propose a novel method to obtain ultrahigh enhancement of local electric fields by using a silver nanoshell with a gain core above a silver substrate. Numerical results show that an ultrahigh enhancement factor of the local electric field on the order of 10<sup>5</sup>-10<sup>6</sup> and a SERS enhancement factor on the order of 10<sup>20</sup>-10<sup>25</sup> can be obtained with the present system. The SERS enhancement factor is five orders of magnitude greater than the highest theoretical value reported for SERS applications at the single-molecule level. In addition, we use the finite-element method to analyze in detail the influences of the gain coefficient of the gain core and the other structure parameters on the enhancement factor. |
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| ISSN: | 1943-0655 |