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Multiple-polarization-sensitive photodetector Based on a plasmonic metasurface.

Qinghu Bai1,2, Xin Huang1,2, Shuo Du1,2

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, People's Republic of China. xinhuang@iphy.ac.cn.

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|April 16, 2024
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Summary

This study introduces a novel metasurface-integrated semiconductor for detecting multiple light polarizations. The device, using a MoSe2 monolayer and H-shaped nanostructure, achieves sensitive detection of both circularly and linearly polarized light.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Nanotechnology

Background:

  • On-chip polarization-sensitive photodetectors are crucial for compact optoelectronic systems.
  • Existing detectors using chiral or anisotropic materials are limited to detecting either circularly polarized light (CPL) or linearly polarized light (LPL), not both.
  • There is a need for devices capable of multiple-polarization-sensitive photodetection.

Purpose of the Study:

  • To experimentally demonstrate a metasurface-integrated semiconductor for multiple-polarization-sensitive photodetection at visible wavelengths.
  • To investigate the device's ability to resolve both CPL and LPL.
  • To explore potential applications in fields requiring polarization analysis.

Main Methods:

  • Fabrication of a device comprising a monolayer of Molybdenum diselenide (MoSe2) on an H-shaped plasmonic nanostructure.
  • Utilizing the geometric chirality and anisotropy of the H-shaped nanostructure to achieve polarization-resolved optical responses.
  • Converting polarization-sensitive optical absorption into photocurrent via the photoconductive effect.

Main Results:

  • Demonstration of a metasurface-integrated semiconductor capable of detecting both CPL and LPL.
  • Achieved a high photocurrent circular dichroism (CD) of 0.35 at 810 nm for CPL detection.
  • Observed a photocurrent linear polarization (LP) of 0.4 at 633 nm for LPL detection.

Conclusions:

  • The developed device successfully realizes multiple-polarization-sensitive photodetection.
  • This technology offers a promising route for advanced applications in medical analysis, biology, and remote sensing.
  • The integration of plasmonic metasurfaces with 2D semiconductors enables novel polarization-sensitive optoelectronic devices.