Dicke-Cooperativity-Assisted Ultrastrong Coupling Enhancement in Terahertz Metasurfaces

Area of Science:

• Quantum Optics
• Metasurfaces
• Quantum Information Technology

Background:

• Dicke cooperativity, a phenomenon in quantum optics, describes enhanced light-matter interaction in systems of multiple atoms.
• This cooperative effect is crucial for advancements in quantum information technology.
• Standard light-matter interaction paradigms have limitations in achieving maximal cooperativity.

Purpose of the Study:

• To extend the concept of Dicke cooperativity beyond traditional light-matter interactions.
• To engineer a terahertz metasurface with multiple meta-atoms to achieve enhanced Dicke cooperativity.
• To explore the potential for ultrastrong coupling regimes and novel quantum applications.

Main Methods:

• Designed a terahertz metasurface comprising N meta-atoms.
• Engineered the capacitive split-gap within the meta-atoms to control coupling strength.
• Investigated the hybridization of localized surface plasmon resonance and surface lattice resonance.

Main Results:

• Demonstrated enhanced Dicke cooperativity in the terahertz metasurface.
• Achieved hybridization of plasmon resonances, leading to cooperative enhancement.
• Enhanced the coupling rate into the ultrastrong coupling regime by a significant factor.

Conclusions:

• The engineered terahertz metasurface provides a novel platform for Dicke cooperativity.
• This approach enables effective control of fermionic systems via weak pumping.
• Potential applications include superradiant emission and ultrasensitive molecular sensing.