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Using Microwave and Macroscopic Samples of Dielectric Solids to Study the Photonic Properties of Disordered Photonic Bandgap Materials
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Hot-Band Absorption Can Mimic Entangled Two-Photon Absorption.

Alexander Mikhaylov1, Ryan N Wilson1,2, Kristen M Parzuchowski1,2

  • 1JILA, 440 UCB, University of Colorado, Boulder, Colorado 80309, United States.

The Journal of Physical Chemistry Letters
|February 7, 2022
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Summary
This summary is machine-generated.

Entangled two-photon absorption (E2PA) may not offer significant ultralow-power microscopy advantages. A confounding hot-band absorption (HBA) mechanism can overestimate E2PA

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Area of Science:

  • Quantum optics
  • Biophotonics
  • Fluorescence microscopy

Background:

  • Entangled two-photon absorption (E2PA) promises ultralow-power microscopy.
  • Significant debate exists regarding the actual quantum enhancement in excitation efficiency.

Purpose of the Study:

  • Investigate the fluorescence signals of Rhodamine 6G and LDS798.
  • Clarify the role of entangled photon pairs versus classical light sources in excitation.
  • Determine the magnitude of quantum enhancement in E2PA.

Main Methods:

  • Excitation of Rhodamine 6G and LDS798 using a CW laser and an entangled photon pair source (∼1060 nm).
  • Analysis of fluorescence signals to differentiate between E2PA and other absorption mechanisms.
  • Comparison of power dependencies to identify contributions from hot-band absorption (HBA).

Main Results:

  • Observed a signal with linear power dependence, mimicking E2PA.
  • Identified this signal as originating from hot-band absorption (HBA), a one-photon process.
  • HBA contributions can lead to several orders of magnitude overestimation of E2PA's quantum advantage.

Conclusions:

  • Hot-band absorption (HBA) can be misinterpreted as E2PA under typical experimental conditions.
  • The true quantum advantage of E2PA may be significantly less than previously reported.
  • Re-evaluation of E2PA experiments is necessary to account for HBA contributions.