Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Near-Field Nanoprobing Using Si Tip-Au Nanoparticle Photoinduced Force
  Microscopy with 120:1 Signal-to-Noise Ratio, Sub-6-nm Resolution   A nanoscopy technique that can characterize light-matter interactions with
ever increasing spatial resolution and signal-to-noise ratio (SNR) is desired
for spectroscopy at molecular levels. Photoinduced force microscopy (PiFM) with
Au-coated probe-tips has been demonstrated as an excellent solution for this
purpose. However, its accuracy is limited by the asymmetric shape of the
Au-coated tip resulting in tip-induced anisotropy. To overcome such
deficiencies, we propose a Si tip-Au nanoparticle (NP) combination in PiFM. We
map the near-field distribution of the Au NPs in various arrangements with an
unprecedented SNR of up to 120, a more than 10-fold improvement compared to
conventional optical near-field techniques, and a spatial resolution down to
5.8 nm, smaller than 1/100 of the wavelength, even surpassing the tip-curvature
limitation. We also map the beam profile of an azimuthally polarized beam (APB)
with an excellent symmetry. The proposed approach can lead to the promising
single molecule spectroscopy.

22
The categories of this paper are: chao-dyn
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
4
The categories of this paper are: cond-mat
18
The categories of this paper are: econ
14
The categories of this paper are: math-ph
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
12
The categories of this paper are: nucl-th
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
10
The categories of this paper are: q-bio
29
The categories of this paper are: funct-an
30
The categories of this paper are: q-alg