Selective reflection from an Rb layer with a thickness below λ/12 and applications

Area of Science:

• Atomic physics
• Quantum optics
• Surface science

Background:

• Investigating atom-surface interactions is crucial for understanding quantum phenomena in confined systems.
• Selective reflection provides insights into the optical properties of atomic vapors near surfaces.
• Thin vapor cells offer unique environments for studying evanescent field effects.

Purpose of the Study:

• To explore the optical properties of ultrathin rubidium (Rb) vapor cells.
• To investigate the influence of atom-surface interactions on selective reflection spectra.
• To analyze the behavior of atomic transitions in strong magnetic fields within these confined geometries.

Main Methods:

• Utilizing selective reflection spectroscopy on ultrathin Rb vapor cells (L<70 nm).
• Applying strong magnetic fields (B>2 kG) to induce Paschen-Back splitting.
• Analyzing frequency-resolved spectral components of Rb87 and Rb85.

Main Results:

• Observed a significant 240 MHz redshift in selective reflection spectra for a 40 nm Rb cell, attributed to atom-surface interactions.
• Recorded complete frequency-resolved hyperfine Paschen-Back splitting for both Rb87 (four components) and Rb85 (six components).
• Demonstrated the influence of cell thickness on spectral shifts and magnetic field effects.

Conclusions:

• Atom-surface interactions play a critical role in modifying the optical response of ultrathin atomic vapors.
• Ultrathin vapor cells provide a sensitive platform for probing fundamental atomic physics and quantum electrodynamics effects.
• The observed spectral splitting offers a method for precise analysis of atomic energy levels in confined magnetic environments.