Tag Archives: TERS

High-resolution imaging of graphene by tip-enhanced coherent anti-Stokes Raman scattering

In their research article “High-resolution imaging of graphene by tip-enhanced coherent anti-Stokes Raman scattering” Xiaolong Kou, Qian Zhou, Dong Wang, Jinghe Yuan, Xiaohong Fang and Lijun Wan report how they achieved the first single atom layer TECARS (tip-enhanced coherent anti-Stokes Raman scattering ) imaging on Graphene with the highest resolution about 20nm.*

The authors used a NANOSENSORS AdvancedTEC™ ATEC-NC AFM tip that they coated with a 20nm Au coating by E-beam evaporation.

With some technological improvements TECARS imaging could be a promising tool for the study of the biochemistry of materials and live cells at the molecular and subcellular levels without labelling as well as other biological, chemical and medical applications.*

Fig. 6. from “High-resolution imaging of graphene by tip-enhanced coherent anti-Stokes Raman scattering “ by Xiaolong Kou  et al. (a) TECARS imaging of graphene. (b) Signal intensity measurement of the yellow line in (a). First single atom layer TECARS (tip-enhanced coherent anti-Stokes Raman scattering ) imaging on Graphene with the highest resolution about 20nm

Fig. 6. from “High-resolution imaging of graphene by tip-enhanced coherent anti-Stokes Raman scattering “ by Xiaolong Kou  et al. :
(a) TECARS imaging of graphene. (b) Signal intensity measurement of the yellow line in (a).

*Xiaolong Kou, Qian Zhou, Dong Wang, Jinghe Yuan, Xiaohong Fang, Lijun Wan
High-resolution imaging of graphene by tip-enhanced coherent anti-Stokes Raman scattering
Journal of Innovative Optical Health Sciences, Vol. 12, No. 01, 1841003 (2019)
DOI: https://doi.org/10.1142/S1793545818410031

Please follow this external link for the full research article: https://www.worldscientific.com/doi/full/10.1142/S1793545818410031

Open Access The article “High-resolution imaging of graphene by tip-enhanced coherent anti-Stokes Raman scattering” by Xiaolong Kou, Qian Zhou, Dong Wang, Jinghe Yuan, Xiaohong Fang and Lijun Wan is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

Near-Field Plasmonic probe with Super Resolution and High Throughput and Signal-to-Noise Ratio

Plasmonic AFM tip using a quartz-like NANOSENSORS qp-CONT as basis, as described in: Ruei-Han Jiang et Al., Near-Field Plasmonic Probe with Super Resolution and High Throughput and Signal-to-Noise Ratio, Nano Letters Article ASAP DOI: 10.1021/acs.nanolett.7b04142, image courtesy of Ruei-Han Jiang, Department of Materials Science and Engineering National Tsing Hua University
Plasmonic AFM tip using a quartz-like NANOSENSORS Uniqprobe qp-CONT as basis, image courtesy of Ruei-Han Jiang, Department of Materials Science and Engineering, National Tsing Hua University

In the recently published article “New-Field Plasmonic probe with Super Resolution and High Throughput and Signal-to-Noise Ratio by Ta-Jen Yen et. Al. a plasmonic tip is described that could be employed in near-field optics, nanolithography, tip-enhanced Raman spectroscopy and other applications.

The authors of the article demonstrate what other papers have already talked about in the past: it is possible to use probes like the NANOSENSORS Uniqprobe qp-CONT as basis to make working probes for NSOM or TERS, by using radially polarized light. They go a step further by FIB tailoring the metal film that fully covers the transparent tip.

Congratulations to the authors!

You can find the full article if you follow this external link:

Ruei-Han Jiang, Chi Chen, Ding-Zheng Lin, He-Chun Chou, Jen-You Chu, and Ta-Jen Yen
Near-Field Plasmonic Probe with Super Resolution and High Throughput and Signal-to-Noise Ratio
Nano Letters Article ASAP
DOI: 10.1021/acs.nanolett.7b04142
http://pubs.acs.org/doi/full/10.1021/acs.nanolett.7b04142

A lot of work was done by research groups at the University of Neuchâtel, more than 10 years back, demonstrating the high resolution properties of microfabricated apertureless (fully metal coated) transparent quartz tips, where a connection between the observed high spatial resolution and longitudinally polarized fields confined at the probe apex was observed. The authors gave direct experimental evidence that, after injection of a radially polarized beam, a confined single spot is produced at the tip apex.

For further relevant papers, also refer to:

Tortora, E. Descrovi, L. Aeschimann, L. Vaccaro, H.-P. Herzig, R. Dändliker,
Selective coupling of HE 11 and TM 01 modes into microfabricated fully metal-coated quartz probes, Ultramicroscopy 107, 158 (2007), https://doi.org/10.1016/j.ultramic.2006.07.004
https://www.sciencedirect.com/science/article/pii/S030439910600146X

Descrovi, L. Vaccaro, L. Aeschimann, W. Nakagawa, U. Staufer, H.-P. Herzig,
Optical properties of microfabricated fully-metal-coated near-field probes in collection mode, J. Opt. Soc. Am. A/Vol. 22, No 7 (2005), https://doi.org/10.1364/JOSAA.22.001432
https://www.osapublishing.org/josaa/abstract.cfm?uri=josaa-22-7-1432

Descrovi, L. Vaccaro, W. Nakagawa, L. Aeschimann, U. Staufer, H.-P. Herzig,
Collection of transverse and longitudinal fields by means of apertureless nanoprobes with different metal coating characteristics, J. Appl. Phys. Lett., vol. 85, 5340 (2004), https://doi.org/10.1063/1.1827925
http://aip.scitation.org/doi/10.1063/1.1827925