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Related Concept Videos

Raman Spectroscopy: Overview01:20

Raman Spectroscopy: Overview

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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.
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Raman Spectroscopy Instrumentation: Overview01:26

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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...
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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Related Experiment Video

Updated: Jun 30, 2025

Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
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Adaptive Gap-Tunable Surface-Enhanced Raman Spectroscopy.

Taeyoung Moon1, Huitae Joo1, Bamadev Das2

  • 1Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang 37673, Republic of Korea.

Nano Letters
|March 18, 2024
PubMed
Summary

Researchers developed a flexible gold nanogap device for tunable surface-enhanced Raman spectroscopy (SERS). This adaptive SERS system allows selective enhancement of molecular vibrations and dynamic intensity control for advanced sensing applications.

Keywords:
SERSadaptive opticsflexible devicenanogapplasmonic structure

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Area of Science:

  • Plasmonics
  • Nanophotonics
  • Spectroscopy

Background:

  • Static gap plasmon (GP) resonance in surface-enhanced Raman spectroscopy (SERS) lacks tunability and has a narrow resonance.
  • Existing SERS methods struggle to selectively enhance specific molecular vibrational modes.

Purpose of the Study:

  • To develop an adaptive, gap-tunable SERS device for selective enhancement and modulation of different vibrational modes.
  • To demonstrate dynamic control over SERS intensity and explore applications in high-speed biomedical sensing.

Main Methods:

  • Fabrication of flexible gold nanogaps on a polyethylene terephthalate substrate.
  • Mechanical bending to engineer gap width and tune GP resonance.
  • Adaptive optical control using wavefront shaping of excitation beams.

Main Results:

  • Achieved tunable GP resonance up to ~1200 cm-1 by engineering nanogap width.
  • Demonstrated selective enhancement of different Raman spectral regions of molecules.
  • Dynamically controlled SERS intensity via wavefront shaping and confirmed advantages in simulated high-speed biomedical sensing.

Conclusions:

  • The adaptive gap-tunable SERS device offers dynamic control over enhanced chemical responses.
  • This approach provides a unique method for observing and modulating specific molecular vibrations.
  • The flexible nanogap technology shows promise for high-speed biomedical sensing applications.