Raman scattering from surface optical phonon in diameter modulated AlN nanotips

Sahoo, Satyaprakash; Dhara, S.; Arora, A. K.; Krishnan, R.; Chandramohan, P.; Srinivasan, M. P.
March 2010
Applied Physics Letters;3/8/2010, Vol. 96 Issue 10, p103113
Academic Journal
We investigate the optical phonons in AlN nanotips using Raman spectroscopy. Apart from the group theoretically allowed optical phonons, an additional phonon mode at 850 cm-1 has been observed. Furthermore, the peak position has shown a significant redshift and its intensity increases dramatically with the change in dielectric medium. In view of its strong response to change in dielectric medium and good agreement with calculated surface optical phonon frequency in AlN, the observed phonon mode is assigned as surface optical phonon, which could be attributed to the diameter modulation in case of AlN nanotip.


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