TY - JOUR

T1 - Local phonon imaging of AlN nanostructures with nanoscale spatial resolution

AU - Milekhin, Ilya

AU - Anikin, Kirill

AU - Kurus, Nina N

AU - Mansurov, Vladimir G

AU - Malin, Timur V

AU - Zhuravlev, Konstantin S

AU - Milekhin, Alexander G

AU - Latyshev, Alexander V

AU - Zahn, Dietrich R T

N1 - The authors gratefully acknowledge financial support from RFBR (Project No. 19-52-12041_NNIO_a) and the DFG grants ZA 146/43-1 and ZA 146/44-1. Experiments were carried out by using the equipment of the shared-user facility “Nanostructures” in the ISP Center. The studies were supported by the Ministry of Science and Higher Education of the Russian Federation, project #FSUS-2020-0029. The authors acknowledge core facilities “VTAN” (Novosibirsk State University) for the access to its experimental equipment. This journal is © The Royal Society of Chemistry.

PY - 2023/5/16

Y1 - 2023/5/16

N2 - We demonstrate local phonon analysis of single AlN nanocrystals by two complementary imaging spectroscopic techniques: tip-enhanced Raman scattering (TERS) and nano-Fourier transform infrared (nano-FTIR) spectroscopy. Strong surface optical (SO) phonon modes appear in the TERS spectra with their intensities revealing a weak polarization dependence. The local electric field enhancement stemming from the plasmon mode of the TERS tip modifies the phonon response of the sample, making the SO mode dominate over other phonon modes. The TERS imaging allows the spatial localization of the SO mode to be visualized. We were able to probe the angle anisotropy on the SO phonon modes in AlN nanocrystals with nanoscale spatial resolution. The excitation geometry and the local nanostructure surface profile determine the frequency position of SO modes in nano-FTIR spectra. An analytical calculation explains the behaviour of SO mode frequencies vs. tip position with respect to the sample.

AB - We demonstrate local phonon analysis of single AlN nanocrystals by two complementary imaging spectroscopic techniques: tip-enhanced Raman scattering (TERS) and nano-Fourier transform infrared (nano-FTIR) spectroscopy. Strong surface optical (SO) phonon modes appear in the TERS spectra with their intensities revealing a weak polarization dependence. The local electric field enhancement stemming from the plasmon mode of the TERS tip modifies the phonon response of the sample, making the SO mode dominate over other phonon modes. The TERS imaging allows the spatial localization of the SO mode to be visualized. We were able to probe the angle anisotropy on the SO phonon modes in AlN nanocrystals with nanoscale spatial resolution. The excitation geometry and the local nanostructure surface profile determine the frequency position of SO modes in nano-FTIR spectra. An analytical calculation explains the behaviour of SO mode frequencies vs. tip position with respect to the sample.

UR - https://www.scopus.com/record/display.uri?eid=2-s2.0-85158836932&origin=inward&txGid=4c6d56d28aeebf7422148d486d2cd0b3

U2 - 10.1039/d3na00054k

DO - 10.1039/d3na00054k

M3 - Article

C2 - 37205283

VL - 5

SP - 2820

EP - 2830

JO - Nanoscale Advances

JF - Nanoscale Advances

SN - 2516-0230

IS - 10

ER -