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Total internal reflection fluorescence microscopy or TIRF is an advanced microscopic technique used to visualize fluorophores in samples close to a solid surface with a higher refractive index, such as a glass coverslip. TIRF only allows fluorophores in proximity to the solid surface to be excited. When light from a medium with a lower refractive index (such as air) hits the glass coverslip at a critical angle, the light undergoes total internal reflection stead of passing through the glass.
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Attenuated internal reflection terahertz imaging.

Antoine Wojdyla1, Guilhem Gallot

  • 1Laboratoire d’Optique et Biosciences, École Polytechnique, CNRS, 91128 Palaiseau, France.

Optics Letters
|March 5, 2013
PubMed
Summary
This summary is machine-generated.

We developed a terahertz imaging method using attenuated internal reflection for analyzing liquid and biological samples. This technique achieves subwavelength resolution, offering new possibilities for sample analysis.

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Area of Science:

  • Terahertz (THz) imaging
  • Spectroscopy
  • Biophysics

Background:

  • Terahertz (THz) imaging offers unique capabilities for non-ionizing, non-destructive analysis of various materials.
  • Analyzing liquid and biological samples with THz imaging presents challenges due to strong absorption and scattering.
  • Existing THz imaging techniques often lack the resolution required for detailed analysis of complex biological structures.

Purpose of the Study:

  • To develop a novel terahertz (THz) imaging technique.
  • To enable high-resolution analysis of liquid and biological samples.
  • To achieve subwavelength resolution in THz imaging.

Main Methods:

  • Utilized an attenuated total internal reflection (ATR) geometry.
  • Integrated the ATR prism into a THz time-domain spectroscopy (TDS) system.
  • Employed a high-resistivity, low-loss silicon prism for efficient THz wave coupling.
  • Implemented a detection scheme based on the differential spectral phase of orthogonal polarizations.

Main Results:

  • Demonstrated successful imaging of biological samples.
  • Achieved subwavelength longitudinal resolution of λ/16.
  • The ATR technique proved effective for analyzing liquid and biological media.
  • The differential spectral phase detection scheme provided sensitive measurements.

Conclusions:

  • The presented THz imaging technique based on attenuated internal reflection is well-suited for liquid and biological sample analysis.
  • The method achieves high resolution, enabling detailed characterization of samples.
  • This advancement opens new avenues for non-destructive imaging in life sciences and material analysis.