Magnetic-Polaron-Induced Enhancement of Surface Raman Scattering
Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
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Original language | English |
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Article number | 19025 |
Journal / Publication | Scientific Reports |
Volume | 6 |
Publication status | Published - 12 Jan 2016 |
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Link to Scopus | https://www.scopus.com/record/display.uri?eid=2-s2.0-84954566424&origin=recordpage |
Permanent Link | https://scholars.cityu.edu.hk/en/publications/publication(9c6e733b-cb9c-4fe6-aa46-9783ab702993).html |
Abstract
The studies of the effects of magnetic field on surface enhanced Raman scattering (SERS) have been so far limited to the case of ferromagnetic/noble-metal, core/shell nano-particles, where the influence was always found to be negative. In this work, we investigate the influence of magnetic field on a diluted magnetic semiconductor/metal SERS system. Guided by three dimensional finite-difference time-domain simulations, a high efficient SERS substrate was obtained by diluting Mn into Au-capped ZnO, which results in an increase of the dielectric constant and, therefore, an enhancement of Raman signals. More remarkably, an increase of intensities as well as a reduction of the relative standard deviation (RSD) of Raman signals have been observed as a function of the external magnetic strength. We ascribe these positive influences to magnetic-field induced nucleation of bound magnetic polarons in the Mn doped ZnO. The combination of diluted magnetic semiconductors and SERS may open a new avenue for future magneto-optical applications.
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Magnetic-Polaron-Induced Enhancement of Surface Raman Scattering. / Shao, Qi; Liao, Fan; Ruotolo, Antonio.
In: Scientific Reports, Vol. 6, 19025, 12.01.2016.Research output: Journal Publications and Reviews (RGC: 21, 22, 62) › 21_Publication in refereed journal › peer-review
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