Simultaneous AoLP and DoLP Detection in a Bias-Switchable PdSe₂/MoS₂/PdSe₂ Heterojunction for Polarization...

Area of Science:

• Optoelectronics and Nanomaterials Science
• Advanced Photodetector Technology

Background:

• Simultaneously detecting angle of linear polarization (AoLP) and degree of linear polarization (DoLP) in a single device is challenging.
• Weak polarization states in anisotropic materials hinder accurate detection.

Purpose of the Study:

• To develop an on-chip photodetector for simultaneous AoLP and DoLP detection.
• To overcome limitations of existing polarization detection methods.

Main Methods:

• Fabrication of a twisted monopole barrier photodetector using a PdSe2/MoS2/PdSe2 heterostructure.
• Utilized bias-switchable polarization detection across a wide spectral range.
• Demonstrated operation without plasmonic/metasurface nanostructures or polarization filters.

Main Results:

• Achieved a rapid response time of 7-12 µs.
• Successfully reconstructed AoLP and DoLP distributions of objects in an imaging demonstration.
• Exhibited bipolar characteristics at room temperature under zero-bias conditions.

Conclusions:

• The developed photodetector enables on-chip, filter-free, and wide-spectral polarization imaging.
• Demonstrated potential for dual-binary coding in polarimetric-encoded communication.
• Represents a significant advancement for ultra-compact optoelectronic devices.