Fig. 13: Fiber-coupled TERS tip.
a The phase-matching zones for TM0 and HE1 modes are separated for the selective excitation of the former. b Simulation of the nanofocusing at the AgNW tip (tip angle 37°), with TM0 input from the left. The light wavelength is 532 nm for all calculations. c False-color SEM images of a fabricated AgNW-OF probe. The OF tip region (blue) is uncovered for the selective and effective excitation of the TM0 SPP on a sharp-tip silver nanowire (200 nm in diameter, ~5 nm in tip radius). Inset of c: enlarged view of the AgNW tip. d STM topographic image of SWCNTs on an Au film. Top inset: cross-sectional profile along the dashed line. Bottom inset: the possible configurations of the bundle. e Intensity of the Raman peak at 1526 cm−1 along the white dashed line in (d). A, B, C in d and e indicate the position of the Raman spectra in (f). Reprinted with permission from ref. 107 from Springer Nature: Nature Photonics, Copyright (2019)
