Polarization Sensitive Photodetectors Based on Two-Dimensional WSe₂

Area of Science:

• Materials Science
• Optoelectronics
• Nanotechnology

Background:

• Two-dimensional (2D) materials offer unique electronic and optical properties.
• Graphene-like semiconductors, such as tungsten diselenide (WSe2), are promising for advanced optical devices.
• Developing polarization-sensitive and spectrally selective optical detectors is crucial for various applications.

Purpose of the Study:

• To impart polarization-sensitive properties to 2D semiconductor films.
• To enhance the optical sensitivity of detectors based on 2D materials.
• To investigate the role of surface plasmon resonance in enhancing detector performance.

Main Methods:

• Ordered silver triangular nanoprisms were applied to 2D semiconductor films (WSe2).
• Surface plasmon resonance (SPR) was utilized to enhance optical properties.
• Theoretical modeling was employed to understand SPR peculiarities and determine optimal conditions.

Main Results:

• The application of silver nanoprisms successfully imparted polarization-sensitive properties to WSe2 films.
• Optical sensitivity of detectors was increased by a factor of five due to SPR.
• Optimal conditions for SPR occurrence were identified through theoretical analysis.

Conclusions:

• Silver triangular nanoprisms are effective in creating polarization-sensitive 2D semiconductor films.
• SPR significantly enhances the optical sensitivity of 2D material-based detectors.
• This approach provides an effective route for developing advanced spectrally selective, polarization-sensitive detectors.