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High-resolution Thermal Micro-imaging Using Europium Chelate Luminescent Coatings
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Published on: April 16, 2017

Thermal diffusivity imaging with the thermal lens microscope.

Oluwatosin O Dada1, Peter E Feist, Norman J Dovichi

  • 1Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, USA.

Applied Optics
|December 24, 2011
PubMed
Summary
This summary is machine-generated.

This study introduces a coaxial thermal lens microscope for imaging histological samples. It visualizes absorbance and thermal diffusivity, offering high resolution for tissue analysis.

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Area of Science:

  • Microscopy
  • Biophysics
  • Materials Science

Background:

  • Histological sample analysis often relies on optical properties.
  • Characterizing thermal properties of tissues can provide complementary diagnostic information.
  • Advanced microscopy techniques are needed to enhance contrast and resolution.

Purpose of the Study:

  • To develop and demonstrate a coaxial thermal lens microscope for imaging histological samples.
  • To generate images based on both absorbance and thermal diffusivity.
  • To assess the performance and resolution of the developed microscope.

Main Methods:

  • Utilized a coaxial thermal lens microscope with a modulated pump beam (50 kHz–5 MHz) and CW probe beam.
  • Focused beams onto histological specimens within an inverted microscope.
  • Detected changes in probe beam intensity using a photodiode and lock-in amplifier to record amplitude and phase signals.

Main Results:

  • Generated images correlated with sample absorbance (amplitude) and thermal diffusivity (phase).
  • Achieved a spatial resolution of 2.5 μm, limited by the pump beam spot size.
  • Observed optimal contrast and signal-to-noise ratio for phase imaging at frequencies between 0.1–1 MHz for liver and bone tissues.

Conclusions:

  • The coaxial thermal lens microscope effectively images histological samples based on optical and thermal properties.
  • Phase imaging provides valuable contrast related to thermal diffusivity, particularly at specific modulation frequencies.
  • The technique offers high spatial resolution suitable for detailed tissue microstructure analysis.