Three-dimensional Near-field Analysis Through Peak Force Scattering-type Near-field Optical Microscopy
Abstract
Scattering-type scanning near-field optical microscopy (s-SNOM) is instrumental in exploring polaritonic behaviors of two-dimensional (2D) materials at the nanoscale. A sharp s-SNOM tip couples momenta into 2D materials through phase matching to excite phonon polaritons, which manifest as nanoscale interference fringes in raster images. However, s-SNOM lacks the ability to detect the progression of near-field property along the perpendicular axis to the surface. Here, we perform near-field analysis of a micro-disk and a reflective edge made of isotopically pure hexagonal boron nitride (h-11BN), by using three-dimensional near-field response cubes obtained by peak force scattering-type near-field optical microscopy (PF-SNOM). Momentum quantization of polaritons from the confinement of the circular structure is revealed in situ. Moreover, tip-sample distance is found to be capable of fine-tuning the momentum of polaritons and modifying the superposition of quantized polaritonic modes. The PF-SNOM-based three-dimensional near-field analysis provides detailed characterization capability with a high spatial resolution to fully map three-dimensional near-fields of nano-photonics and polaritonic structures.
Cite
@article{arxiv.1908.05230,
title = {Three-dimensional Near-field Analysis Through Peak Force Scattering-type Near-field Optical Microscopy},
author = {Haomin Wang and Jiahan Li and James H. Edgar and Xiaoji G. Xu},
journal= {arXiv preprint arXiv:1908.05230},
year = {2019}
}