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Related Concept Videos

Raman Spectroscopy Instrumentation: Overview01:26

Raman Spectroscopy Instrumentation: Overview

450
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...
450
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.
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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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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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.
The ATR process begins by directing a beam...
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Optical Trapping of Plasmonic Nanoparticles for In Situ Surface-Enhanced Raman Spectroscopy Characterizations
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Temperature Measurement of Trapped, Thermally Sensitive Single Particles in an Optical Trap Using Raman Spectroscopy.

Yukai Ai1, Yong-Le Pan2, Gorden Videen2

  • 1Department of Physics and Astronomy, Mississippi State University, Starkville, MS, USA.

Applied Spectroscopy
|September 15, 2023
PubMed
Summary
This summary is machine-generated.

Researchers developed a Raman spectroscopy method to measure temperature inside optical traps using single-walled carbon nanotubes and micron-sized diamonds. This technique reveals significant temperature differences between the trap center and its hollow beams.

Keywords:
Raman spectroscopyTemperature measurementoptical trappingsingle particletemperature distributionuniversal optical trap

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Area of Science:

  • Optical trapping
  • Spectroscopy
  • Nanomaterials
  • Thermal analysis

Background:

  • Optical traps are crucial for manipulating micro/nano-particles.
  • Temperature elevation within optical traps poses challenges for particle studies.
  • Direct temperature measurement inside optical traps is difficult.

Purpose of the Study:

  • To introduce a novel method for measuring temperature inside universal optical traps (UOTs).
  • To characterize temperature distribution within UOTs using Raman spectroscopy.
  • To assess the heating rate of particles in optical traps.

Main Methods:

  • Utilized Raman spectroscopy of single-walled carbon nanotubes (SWCNTs) and micron-sized diamonds (MSDs).
  • Measured Raman shifts to determine temperature of trapped particles.
  • Investigated temperature distribution by trapping particles at different locations within the UOT.

Main Results:

  • Demonstrated that the UOT center is significantly cooler than its hollow beams.
  • Quantified particle surface temperature changes from 322 K to 830 K with varying laser power (200-2950 mW).
  • Determined a heating rate of 18.3 ± 0.4 °C/100 mW for high thermal-absorbing particles at the UOT center.

Conclusions:

  • The developed Raman spectroscopy method accurately measures temperature distribution in optical traps.
  • This technique is valuable for studying material properties, phase transitions, and chemical reactions involving trapped particles.
  • The findings provide critical insights into thermal effects within optical trapping systems.