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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

601
The underlying principle of Raman spectroscopy is based on the interaction between light and matter, specifically molecules' inelastic scattering of photons. When a monochromatic beam of light, typically from a laser source, interacts with a sample, most scattered light has the same frequency as the incident light. This is known as Rayleigh scattering.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
601
Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

532
A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
The monochromatic laser source, typically using visible or near-infrared radiation, generates a highly focused beam of light. This light interacts with the molecules of the sample, scattering some of the light. Liquid and gaseous samples are usually tested in ordinary glass capillaries, while solids can be analyzed as powders packed in capillaries or as potassium...
532

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Related Experiment Video

Updated: Sep 12, 2025

Optical Trapping of Plasmonic Nanoparticles for In Situ Surface-Enhanced Raman Spectroscopy Characterizations
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Plasmonic Fiber Tip-Enhanced Raman Spectroscopy Based on Shear-Force Near-Field Microscopy.

Zhonglin Xie1, Chao Meng1, Leijia Huang1

  • 1Key Laboratory of Light Field Manipulation and Information Acquisition, Ministry of Industry and Information Technology, School of Physical Science and Technology, Northwestern Polytechnical University, Xi'an 710129, China.

Nano Letters
|August 6, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a novel plasmonic fiber tip (PFT) for scanning near-field optical microscopy (SNOM) to enhance nanospectroscopy. The new tip-enhanced Raman spectroscopy (TERS) platform offers improved nanoscale optical characterization.

Keywords:
Gradient-field RamanOptical fiber vector light fieldScanning near-field optical microscopyTip nanofocusing light sourceTip-enhanced Raman spectroscopy

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Area of Science:

  • Nanophotonics
  • Spectroscopy
  • Microscopy

Background:

  • Shear-force feedback-based scanning near-field optical microscopy (SNOM) is crucial for nanoscale optical characterization.
  • Aperture fiber tip (ATFT) limitations include low energy conversion efficiency, hindering nanospectroscopy applications.

Purpose of the Study:

  • To develop an enhanced SNOM-TERS platform for improved nanoscale spectral characterization.
  • To overcome the limitations of traditional ATFT in SNOM applications.

Main Methods:

  • Integration of a plasmonic fiber tip (PFT) into a shear-force feedback-based SNOM system.
  • Utilizing fiber radial vector mode (RVM) for internal excitation of the PFT.
  • Developing a tip-enhanced Raman spectroscopy (TERS) platform.

Main Results:

  • The PFT achieved significant enhancement in electric-field intensity and gradient effects.
  • Simultaneous acquisition of shear-force topography and nanoscale spectral information (gradient-field Raman spectrum).
  • Demonstrated improved resolution and sensitivity for nanoscale analysis.

Conclusions:

  • The developed fiber-RVM internal excitation-based SNOM-TERS platform offers a promising solution for nanoscale optical characterization.
  • This advancement holds significant potential for applications in nanophotonics and precise spectral analysis.
  • The enhanced platform overcomes previous limitations, enabling more detailed investigations at the nanoscale.