Optical nanofiber as an efficient tool for manipulating and probing atomic Fluorescence.

Area of Science:

• Atomic physics
• Optical physics
• Nanophotonics

Background:

• Coupling atomic fluorescence to optical modes is crucial for quantum technologies.
• Subwavelength optical fibers offer strong light-matter interaction.
• Observing fluorescence from single or few atoms is challenging.

Purpose of the Study:

• To demonstrate efficient coupling of atomic fluorescence to an optical nanofiber.
• To show that fluorescence from a small number of atoms near the nanofiber can be observed.
• To utilize this technique for high-precision probing of atom-surface interactions.

Main Methods:

• Experimental demonstration of fluorescence coupling to a subwavelength-diameter silica optical nanofiber.
• Observation of atomic fluorescence via a single-mode optical fiber.
• Measurement of fluorescence excitation spectra to probe interactions.

Main Results:

• Efficient coupling of atomic fluorescence to the guided mode of the optical nanofiber was achieved.
• Fluorescence from a very small number of atoms around the nanofiber was readily observed.
• The technique allowed for high-precision probing of van der Waals interactions between atoms and the fiber surface.

Conclusions:

• Optical nanofibers provide an efficient platform for detecting and studying small numbers of atoms.
• This method offers a novel approach for high-precision measurements of atom-surface interactions.
• The demonstrated technique has potential applications in quantum sensing and atomic physics research.