Terahertz radiation of microcavity dipolaritons

Area of Science:

• Quantum optics
• Condensed matter physics
• Terahertz (THz) photonics

Background:

• Exciton-polaritons are quasiparticles formed from the interaction of excitons and photons.
• Terahertz (THz) radiation has applications in spectroscopy, imaging, and communications.
• Generating THz radiation efficiently remains a challenge.

Purpose of the Study:

• To propose and investigate the use of dipolaritons for efficient THz radiation generation.
• To optimize the structural parameters of a microcavity system for enhanced THz emission.
• To explore the influence of electronic tunnel coupling on THz emission characteristics.

Main Methods:

• Utilizing dipolaritons (exciton-polaritons with large dipole moments) coupled to a planar microcavity.
• Exciting the system with two THz-detuned lasers to induce dipole moment oscillations.
• Optimizing structural parameters of AlGaAs double quantum wells embedded in a microcavity.

Main Results:

• Demonstrated THz radiation generation via dipole moment oscillations of dipolaritons.
• Identified that maximum THz emission intensity occurs when laser frequencies match different dipolariton states.
• Investigated the trade-off between polariton dipole moment and Rabi splitting due to electronic tunnel coupling.

Conclusions:

• Dipolaritons in microcavities offer a promising route for THz radiation generation.
• System optimization and control of laser excitation are crucial for maximizing THz emission.
• Electronic tunnel coupling presents a tunable parameter influencing THz emission properties.