Laser-Induced Frequency Tuning of Fourier-Limited Single-Molecule Emitters

Area of Science:

• Quantum Optics
• Materials Science
• Physical Chemistry

Background:

• Local interactions of light and charges in organic solids drive fundamental phenomena.
• Controlling quantum emitters is crucial for multiphoton experiments in quantum photonics.

Purpose of the Study:

• To observe and interpret the laser-induced frequency shifts of organic chromophores at the single-molecule level.
• To apply this laser-tuning method for synchronizing multiple quantum emitters for photonic applications.

Main Methods:

• Single-molecule spectroscopy on organic chromophores in host matrices at liquid helium temperatures.
• Utilizing focused laser beams to induce persistent Stark shifts in molecular transition frequencies.
• Quantum chemistry calculations to support the photoionization cascade mechanism.

Main Results:

• Observed laser-induced shifts of organic chromophore transition frequencies by hundreds of times their natural line width.
• Interpreted shifts as a photoionization cascade creating a stable electric field (Stark shift).
• Successfully brought five spatially separated quantum emitters into resonance, reducing a 20 GHz frequency gap.

Conclusions:

• The developed laser-tuning method offers precise, fabrication-free control over quantum emitter frequencies.
• This technique is promising for synchronizing multiple emitters in photonic quantum technologies.
• The method overcomes inhomogeneous broadening limitations, showing potential for advanced quantum applications.