Spintronic terahertz emission with manipulated polarization (STEMP)

Area of Science:

• Physics
• Quantum Mechanics
• Materials Science

Background:

• Chiral terahertz (THz) radiation is essential for advanced applications like quantum control, spectroscopy, and sensing.
• Existing optical generation methods have limitations, driving the need for more efficient and tunable sources.

Purpose of the Study:

• To review optical generation of circularly-polarized THz radiation.
• To focus on and highlight the advantages of polarization-tunable spintronic THz emission techniques.

Main Methods:

• Review of optical generation techniques for circularly-polarized THz radiation.
• Detailed examination of recently emerged spintronic THz emission methods.
• Analysis of material structure engineering for THz emission.

Main Results:

• Spintronic THz emission techniques offer ultra-broadband, high efficiency, low cost, and easy integration.
• These methods enable arbitrary manipulation of spin-polarized THz radiation.
• Potential for new electronic structures and quantum nonequilibrium state regulation.

Conclusions:

• Chiral THz sources based on spintronics, ultrafast optics, and material engineering are key to advancing THz science.
• These sources will accelerate developments in nonlinear THz optics, extreme THz science, and various applications.
• Spintronic THz emission provides a powerful experimental tool for diverse THz-based investigations.