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Related Concept Videos

Measuring Reaction Rates03:09

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Polarimetry finds application in chemical kinetics to measure the concentration and reaction kinetics of optically active substances during a chemical reaction. Optically active substances have the capability of rotating the plane of polarization of linearly polarized light passing through them—a feature called optical rotation. Optical activity is attributed to the molecular structure of substances. Normal monochromatic light is unpolarized and possesses oscillations of the electrical...
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Determination of the Excitation and Coupling Rates Between Light Emitters and Surface Plasmon Polaritons
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Polarization interferometry for real-time spectroscopic plasmonic sensing.

Lauren M Otto1, Daniel A Mohr, Timothy W Johnson

  • 1Department of Electrical and Computer Engineering, University of Minnesota, Minneapolis, MN 55455, USA.

Nanoscale
|February 13, 2015
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Summary
This summary is machine-generated.

We developed a new phase measurement technique for plasmonic sensors, enabling real-time detection of refractive index changes. This method offers improved sensitivity for advanced sensing applications.

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Nanotechnology

Background:

  • Plasmonic surfaces are crucial for sensing applications due to their sensitivity to refractive index changes.
  • Traditional methods often rely on intensity-based measurements, which can be limited in sensitivity and quantitative analysis.

Purpose of the Study:

  • To present a quantitative, spectroscopic polarization interferometry phase measurement technique for plasmonic sensors.
  • To demonstrate real-time measurement capabilities and improve sensing performance.

Main Methods:

  • Utilized a liquid crystal variable wave plate for precise phase shift measurements.
  • Employed ultrasmooth gold layers with buried linear gratings as plasmonic sensors.
  • Performed simultaneous intensity and phase measurements of reflected/transmitted light.

Main Results:

  • Achieved quantitative phase measurements on plasmonic surfaces.
  • Demonstrated real-time sensing capabilities by scanning in a quick sequence.
  • Calculated a figure of merit showing improvement over intensity-based surface plasmon resonance measurements.
  • Validated the technique through numerical simulations on periodic plasmonic slits.

Conclusions:

  • The developed phase measurement technique offers enhanced sensitivity and quantitative characterization for plasmonic sensors.
  • This versatile optical method is applicable to various sensor geometries, including nanoparticles, nanogratings, and nanoapertures.
  • The simultaneous measurement of intensity and phase enables comprehensive sensor device analysis.