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High light field confinement for fluorescent correlation spectroscopy using a solid immersion lens.

A Serov1, R Rao, M Gösch

  • 1Institute for Biomedical Imaging, Optics, and Engineering of the Swiss Federal Institute of Technology (EPFL), CH-1015 Lausanne, Switzerland. alexandre.serov@epfl.ch

Biosensors & Bioelectronics
|October 21, 2004
PubMed
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This study demonstrates a solid immersion lens (SIL) enhances single molecule detection in fluorescent correlation spectroscopy. The SIL system offers improved collection efficiency and excitation field confinement compared to conventional confocal microscopy.

Area of Science:

  • Optics and Spectroscopy
  • Microscopy Techniques
  • Biophysics

Background:

  • Single molecule detection is crucial for understanding biological processes.
  • Fluorescent Correlation Spectroscopy (FCS) is a powerful technique for studying molecular dynamics.
  • Confocal microscopy systems are widely used but can be limited in efficiency.

Purpose of the Study:

  • To evaluate the performance of a solid immersion lens (SIL) for single molecule detection using FCS.
  • To compare the SIL system with a conventional confocal setup.
  • To investigate the impact of SIL on collection efficiency and excitation field confinement.

Main Methods:

  • Single molecule detection experiments were conducted using a confocal microscope (ConfoCorr 1).
  • A solid immersion lens (SIL) was integrated and compared with a water immersion objective.

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  • Measurements focused on collection efficiency and excitation field confinement.

    • Main Results:

    • The SIL system exhibited superior field confinement and collection efficiency compared to the conventional setup, despite similar numerical apertures.
    • Introducing spherical aberrations shifted the sample volume but maintained a diffraction-limited focal volume.
    • FCS autocorrelation confirmed free 3D diffusion of dye molecules within the confined light field.

    Conclusions:

    • Solid immersion lenses significantly enhance single molecule detection capabilities in FCS.
    • The SIL approach offers improved optical performance for advanced microscopy applications.
    • This technique enables precise study of molecular diffusion in highly confined environments.