A Room-Temperature Terahertz Photodetector Imaging with High Stability and Polarization-Sensitive Based on...

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Terahertz (THz) detection is crucial for imaging, communication, and sensing but limited by semiconductor bandgaps.
• Developing stable, room-temperature THz polarization detectors is essential for practical applications.

Purpose of the Study:

• To create high-stability, room-temperature THz polarization-sensitive photodetectors (PDs).
• To investigate the performance enhancement using CsFAMA perovskite/metasurface integration.
• To explore different PD structures (T-shaped and I-shaped) for optimal THz detection.

Main Methods:

• Fabrication of two THz PD structures (T-shaped and I-shaped) using CsFAMA perovskite and metasurfaces.
• Characterization of PD performance, including response, response time, noise-equivalent power, and anisotropy ratio.
• Assessment of PD stability and polarization imaging capabilities after prolonged air storage.

Main Results:

• The I-shaped PDs demonstrated superior performance due to THz surface plasmon polariton (SPP) resonance and boundary effects.
• Achieved a high response of 94 V/W, response time of 138 µs, low noise-equivalent power of 5.03 pW/Hz^1/2, and anisotropy ratio of 1.38.
• PDs maintained stability, with a minimal 2% decrease in anisotropy ratio after 240 days of air storage.

Conclusions:

• CsFAMA perovskite/metasurface integration enables high-performance, stable THz polarization detection at room temperature.
• The I-shaped PD design offers a promising platform for advanced THz sensing and imaging.
• This work paves the way for significant advancements in THz technology for materials science, communication, and medical imaging.