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(a) Schematic of the experimental setup for tip-enhanced Raman spectroscopy. (b) Enlarged view around focal area.
Far-field micro-Raman spectrum of GaN, showing good crystalline quality.
Raman spectra obtained with tip (a) off the sample and (b) on the sample. The true near-field component obtained by subtracting (a) from (b) is shown in (c).
Near-field subtraction spectra at some of the randomly chosen tip positions.
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