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Related Concept Videos

Confocal Fluorescence Microscopy01:16

Confocal Fluorescence Microscopy

Confocal microscopy is an advanced microscopic technique. The prime advantage of the confocal microscope over other microscopy techniques is its ability to block the out-of-focus light from the illuminated samples using pinholes. It is widely used with fluorescence optics to obtain high-resolution, sharp contrast images. Unlike optical microscopes, confocal microscopes use a focused beam of light laser to scan the entire sample surface at different z-planes. These microscopes are, therefore,...
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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
07:39

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Published on: July 21, 2018

Confocal surface plasmon microscopy with pupil function engineering.

Bei Zhang1, Suejit Pechprasarn, Jing Zhang

  • 1IBIOS, Faculty of Engineering, University of Nottingham, NG7 2RD, UK.

Optics Express
|March 29, 2012
PubMed
Summary
This summary is machine-generated.

Surface Plasmon microscopy, a technique for measuring refractive index changes, is simplified using a confocal system. This approach enhances stability and simplifies operation for advanced optical measurements.

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Area of Science:

  • Optical microscopy
  • Nanoscale imaging
  • Biophysics

Background:

  • Surface Plasmon microscopy measures local refractive index changes at the micron scale.
  • Interferometric plasmon imaging offers high spatial resolution and sensitivity to refractive index.
  • The V(z) method controls image contrast via sample defocus without significant resolution loss.

Purpose of the Study:

  • To present a simpler and more stable alternative to existing Surface Plasmon microscopy techniques.
  • To address the increased dynamic range demands of confocal systems for plasmon imaging.
  • To optimize light collection and signal-to-noise ratio in Surface Plasmon microscopy.

Main Methods:

  • Implementation of a confocal microscopy system for Surface Plasmon imaging.
  • Utilizing a spatial light modulator (SLM) to engineer the microscope pupil function.
  • Suppression of non-signal contributing light through pupil engineering.

Main Results:

  • Demonstration of a simpler and more stable Surface Plasmon microscopy setup.
  • Successful management of dynamic range challenges in the confocal system.
  • Enhanced signal quality by suppressing stray light via pupil engineering.

Conclusions:

  • Confocal Surface Plasmon microscopy offers a more accessible and robust platform for refractive index measurements.
  • Spatial light modulation is an effective strategy to overcome dynamic range limitations.
  • The developed system provides a valuable tool for high-resolution optical measurements.