A subradiant optical mirror formed by a single structured atomic layer

Area of Science:

• Quantum science and technology
• Atomic physics
• Optical metamaterials

Background:

• Strong and tunable light-matter interactions are crucial for quantum science, enabling quantum property mapping.
• Controlling these interactions via photon-mediated dipole-dipole interactions in structured quantum emitter arrays is a proposed method.
• Experimental demonstration of cooperative enhancement and directional reflection using such arrays remained elusive.

Purpose of the Study:

• To experimentally demonstrate the cooperative subradiant response in a two-dimensional square array of atoms.
• To observe the spectral narrowing of collective atomic response below the quantum-limited decay.
• To investigate the array's function as an efficient mirror and control its properties.

Main Methods:

• Utilizing a two-dimensional square array of atoms in an optical lattice.
• Performing spatially resolved spectroscopic measurements.
• Tuning atom density, particle ordering, and employing Bloch oscillations for dynamic control.

Main Results:

• Direct observation of the cooperative subradiant response.
• Demonstration of the atomic array acting as an efficient mirror with a single monolayer.
• Control over the cooperative response by adjusting atom density and ordering.
• Dynamic control of mirror reflectivity using Bloch oscillations.

Conclusions:

• The study successfully demonstrates cooperative enhancement of light-matter coupling and directional reflection.
• This work validates optical metamaterial engineering using structured atomic ensembles.
• It opens new avenues for controlling many-body physics and advancing light-matter interfaces at the quantum level.