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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

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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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Raman Spectroscopy: Overview01:20

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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.
However, a small fraction of the scattered light exhibits a frequency shift due to the exchange of energy between the incident photons and...
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Updated: Nov 11, 2025

Surface Enhanced Raman Spectroscopy Detection of Biomolecules Using EBL Fabricated Nanostructured Substrates
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Optoplasmonic film for SERS.

Lili Ju1, Jialing Shi1, Chuanyu Liu1

  • 1State Key Laboratory of Coal Mine Disaster Dynamics and Control, Chongqing Key Laboratory of Soft Condensed Matter Physics and Smart Materials, College of Physics, Chongqing University, Chongqing 400044, China.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
|March 27, 2021
PubMed
Summary
This summary is machine-generated.

This study introduces a simple optoplasmonic film using SiO2 microspheres and gold film, achieving ~1000x enhancement in surface-enhanced Raman spectroscopy (SERS) via a microsphere lens effect.

Keywords:
Optoplasmonic structureSERSSiO2 microsphereSurface plasmon

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Nanotechnology

Background:

  • Optoplasmonic hybrid structures combine plasmonic and photonic elements for superior optical properties.
  • Conventional plasmonic and photonic structures have limitations that can be overcome by hybrid designs.

Purpose of the Study:

  • To investigate an optoplasmonic film composed of SiO2 microspheres and a gold film without nanostructures.
  • To explore the enhancement mechanism and influencing factors for surface-enhanced Raman spectroscopy (SERS) using this hybrid structure.

Main Methods:

  • Fabrication of an optoplasmonic film consisting of SiO2 microspheres on a gold film.
  • Experimental measurement of SERS intensity enhancement.
  • Electromagnetic field simulation to elucidate the enhancement mechanism (optical lens effect).

Main Results:

  • A ~1000-fold enhancement in SERS intensity was observed compared to a bare gold film.
  • The enhancement is attributed to the optical lens effect of the SiO2 microsphere, concentrating light under the sphere.
  • Microsphere size and incident light wavelength significantly influence the enhancement magnitude.

Conclusions:

  • The proposed optoplasmonic film offers a simple, nanostructure-free configuration for enhanced SERS.
  • This structure overcomes fabrication and storage challenges associated with nanostructured materials.
  • Potential applications include light harvesting, enhanced spectroscopy, photocatalysis, and optothermal effects.