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Strong near-field light-matter interaction in plasmon-resonant tip-enhanced raman scattering in indium nitride
Zitatschlüssel Poliani2020
Autor Poliani, Emanuele and Seidlitz, Daniel and Ries, Maximilian and Choi, Soo J. and Speck, James S. and Hoffmann, Axel and Wagner, Markus R.
Seiten 28178–28185
Jahr 2020
ISSN 19327455
DOI 10.1021/acs.jpcc.0c04549
Journal Journal of Physical Chemistry C
Jahrgang 124
Nummer 51
Monat dec
Verlag American Chemical Society
Zusammenfassung We report a detailed study of the strong near-field Raman scattering enhancement, which takes place in tip-enhanced Raman scattering (TERS) in indium nitride. In addition to the well-known first-order optical phonons of indium nitride, near-field Raman modes, not detectable in the far-field, appear when approaching the plasmonic probe. The frequencies of these modes coincide with calculated energies of second-order combinational modes consisting of optical zone center phonons and acoustic phonons at the edge of the Brillouin zone. The appearance of strong combinational modes suggests that TERS in indium nitride represents a special case of Raman scattering in which a resonance condition on the nanometer scale is achieved between the localized surface plasmons (LSPs) and surface plasmon polaritons (SPPs) of the probe with the surface charge oscillation of the material. We suggest that the surface charge accumulation (SCA) in InN, which can render the surface a degenerate semiconductor, is the dominating reason for the unusually large enhancement of the TERS signal as compared to other inorganic semiconductors. Thus, the plasmon-resonant TERS (PR-TERS) process in InN makes this technique an excellent tool for defect characterization of indium-rich semiconductor heterostructures and nanostructures with high carrier concentrations.
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