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In vivo Quantification of G Protein Coupled Receptor Interactions using Spectrally Resolved Two-photon Microscopy
14:26

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Published on: January 19, 2011

Entangled photon-pair two-dimensional fluorescence spectroscopy (EPP-2DFS).

M G Raymer1, Andrew H Marcus, Julia R Widom

  • 1Oregon Center for Optics and Department of Physics, University of Oregon , Eugene, Oregon 97403, United States.

The Journal of Physical Chemistry. B
|September 20, 2013
PubMed
Summary
This summary is machine-generated.

We developed entangled photon-pair two-dimensional fluorescence spectroscopy (EPP-2DFS) for sensitive molecular analysis. This quantum method enhances resolution and simplifies spectra for studying electronic couplings.

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Area of Science:

  • Quantum optics
  • Molecular spectroscopy
  • Nonlinear spectroscopy

Background:

  • Traditional 2D fluorescence spectroscopy (2DFS) faces limitations in resolution and background noise.
  • Probing nonlinear electronic responses requires advanced spectroscopic techniques.

Purpose of the Study:

  • Introduce entangled photon-pair two-dimensional fluorescence spectroscopy (EPP-2DFS) for sensitive nonlinear molecular analysis.
  • Demonstrate the advantages of EPP-2DFS over classical 2DFS techniques.

Main Methods:

  • Utilized a Franson interferometer to generate time-frequency-entangled photon pairs.
  • Integrated entangled photons into a fluorescence-detected 2D optical spectroscopic experiment.
  • Excited two-photon-absorbing samples and monitored fluorescence and exciting fields.

Main Results:

  • EPP-2DFS suppresses background signals and enhances time-and-frequency resolution.
  • Achieved suppression of diagonal 2D spectral features and enhancement of off-diagonal cross-peaks.
  • Numerical simulations showed simplified EPP-2DFS spectra for molecular dimers.

Conclusions:

  • EPP-2DFS offers superior resolution for extracting Hamiltonian parameters from coupled molecular systems.
  • The quantum nature of entangled photons is crucial for the observed spectral improvements.
  • EPP-2DFS represents a significant advancement in probing molecular electronic structures.