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Area of Science:

  • Quantum optics
  • Nonlinear optics
  • Materials science

Background:

  • Entangled two-photon absorption (ETPA) is a nonlinear optical phenomenon.
  • Existing methods for detecting ETPA can be complex.
  • Quantum interference techniques offer high sensitivity.

Purpose of the Study:

  • To investigate a new method for detecting ETPA using Hong-Ou-Mandel (HOM) interferometry.
  • To explore the conditions for observing ETPA-induced changes in HOM interferogram visibility.
  • To develop a theoretical model explaining the experimental observations.

Main Methods:

  • Utilizing entangled photons generated via Type-II spontaneous parametric down-conversion (SPDC).
  • Employing an organic Rhodamine B solution as the nonlinear material.
  • Analyzing changes in the visibility of a HOM interferogram.

Main Results:

  • Demonstrated that ETPA affects the visibility of HOM interferograms.
  • Identified conditions under which these visibility changes are detectable.
  • Developed a spectral filtering model consistent with experimental findings.

Conclusions:

  • The study presents a novel approach to detect ETPA by monitoring HOM interferogram visibility.
  • This quantum interference method provides a sensitive tool for ETPA research.
  • The developed model accurately explains the experimental results, offering new insights into ETPA.