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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
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Quantitative plasmonic measurements using embedded phase stepping confocal interferometry.

Bei Zhang1, Suejit Pechprasarn, Michael G Somekh

  • 1Institute of Imaging and Optical Science, IBIOS, University of Nottingham, Nottingham NG7 2RD, UK.

Optics Express
|May 15, 2013
PubMed
Summary
This summary is machine-generated.

This study introduces an embedded phase shifting interferometer for enhanced surface plasmon microscopy. The new method improves signal-to-noise ratio and lateral resolution for measuring surface plasmon properties.

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Area of Science:

  • Optics
  • Plasmonics
  • Microscopy

Background:

  • Previous work established surface plasmon microscopy using a confocal setup with interference.
  • Phase measurement of surface plasmons was achieved by analyzing axial scan position-dependent phase shifts.

Purpose of the Study:

  • To develop an advanced interferometer for surface plasmon microscopy.
  • To enhance the measurement of surface plasmon amplitude and phase using an embedded phase shifting interferometer.
  • To improve signal-to-noise ratio and lateral resolution in surface plasmon characterization.

Main Methods:

  • An embedded phase shifting interferometer was designed and implemented.
  • A spatial light modulator was used to control the phase between reference and surface plasmon beams.
  • Amplitude and phase of surface plasmons were extracted for analysis.

Main Results:

  • The new approach significantly improved signal-to-noise ratio compared to previous methods.
  • Accurate measurement of surface plasmon phase velocity and attenuation was achieved.
  • Reliable results were obtained over smaller axial scan ranges, indicating potential for superior lateral resolution.

Conclusions:

  • The embedded phase shifting interferometer offers a powerful tool for surface plasmon characterization.
  • This technique provides enhanced precision and resolution for studying surface plasmon dynamics.
  • The method facilitates more detailed investigations into plasmonic phenomena.