Entangled Photon Correlations Allow a Continuous-Wave Laser Diode to Measure Single-Photon, Time-Resolved...

Area of Science:

• Quantum Optics
• Spectroscopy
• Materials Science

Background:

• Fluorescence lifetime measurements are crucial for understanding excited-state dynamics and local environments.
• Traditional methods often require complex pulsed laser setups and phase modulation.

Purpose of the Study:

• To demonstrate that entangled photon pairs can replicate pulsed laser fluorescence lifetime experiments.
• To showcase the advantages of using entangled photons for time-resolved fluorescence measurements.

Main Methods:

• Utilized entangled photon pairs generated from a continuous-wave (CW) laser diode.
• Measured picosecond fluorescence lifetimes of indocyanine green in various environments.
• Explored on-chip integration possibilities for fluorescence lifetime measurements.

Main Results:

• Successfully replicated pulsed laser fluorescence lifetime experiments using entangled photons without phase modulation.
• Achieved femtosecond temporal resolutions without advanced source technology.
• Demonstrated wavelength tunability of entangled photon pairs.

Conclusions:

• Entangled photons offer a simplified and more accessible approach to time-resolved fluorescence measurements.
• This method enables straightforward on-chip integration and broad wavelength coverage.
• Opens new possibilities for studying quantum and photosensitive systems.