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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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...
Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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 the...

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Related Experiment Video

Updated: May 26, 2026

Optical Trapping of Plasmonic Nanoparticles for In Situ Surface-Enhanced Raman Spectroscopy Characterizations
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Published on: June 23, 2022

Chiral Plasmonic Fiber Tip-Enhanced Raman Nanospectroscopy.

Heng Zhang1, Zhonglin Xie1, Qinfei Peng1

  • 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
|May 25, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed a chiral plasmonic fiber tip (CPFT) for tip-enhanced Raman spectroscopy (TERS). This novel TERS approach significantly improves signal-to-noise ratio and enables visualization of dark-state Raman modes.

Keywords:
Chiral plasmonic fiber tipElectric-field gradientLow-background tip nanofocusingMultipolar Raman scatteringSymmetry breakingTip-enhanced Raman spectroscopy

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Area of Science:

  • Plasmonics
  • Spectroscopy
  • Nanotechnology

Background:

  • Tip-enhanced Raman spectroscopy (TERS) faces challenges with excitation efficiency and background noise.
  • This limits sensitivity and obscures higher-order Raman transitions, hindering nanoscale analysis.

Purpose of the Study:

  • To overcome TERS limitations by developing a novel chiral plasmonic fiber tip (CPFT).
  • To enhance electric-field intensity and gradient at the tip apex for improved spectroscopy.

Main Methods:

  • Fabrication of CPFT using fused tapering and rotational stretching.
  • Internal excitation of the CPFT by the fiber vector fundamental mode.
  • Utilizing structural asymmetry to achieve constructive interference of surface plasmon polaritons.

Main Results:

  • Achieved a 4-fold higher signal-to-noise ratio compared to conventional side excitation.
  • Successfully visualized dark-state Raman modes, including electric-quadrupole and magnetic-dipole transitions.
  • Demonstrated enhanced electric-field intensity and gradient at the tip hotspot.

Conclusions:

  • The CPFT design effectively amplifies electromagnetic fields and suppresses background noise in TERS.
  • This approach offers a strategy for high-contrast nanoscale spectroscopy.
  • Paves the way for next-generation, highly sensitive, low-noise TERS systems.