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Bandgap Gradient Nanowire Photodetectors for Logic Gates and Encrypted Optical Communication.

Zitong Xu1, Xia Shen1,2, Qihang Lv1

  • 1College of Physics and Optoelectronics, Taiyuan University of Technology, Taiyuan 030024, China.

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|December 30, 2025
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Summary

Gradient bandgap cadmium sulfide selenide (CdS1-xSex) nanowires enable secure optical communication and logic operations. These novel nanostructures demonstrate high performance in photodetectors and optical encryption systems.

Keywords:
bandgap engineeringbandgap-gradient nanowireencrypted optical communicationhigh-performance photodetectionoptoelectronics

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Area of Science:

  • Optoelectronics and Nanotechnology
  • Materials Science
  • Photonics

Background:

  • Optoelectronic devices face increasing security challenges.
  • Gradient structures offer tunable optical signal transmission for advanced applications.
  • Secure optical communication and logical operations require novel materials.

Purpose of the Study:

  • To synthesize and characterize composition/bandgap gradient CdS1-xSex nanowires.
  • To fabricate high-performance photodetectors and photoelectric logic gates.
  • To demonstrate applications in secure optical communication systems.

Main Methods:

  • Magnet-pulling source-moving chemical vapor deposition for nanowire synthesis.
  • Structural characterization and photoluminescence (PL) investigations.
  • Fabrication of photodetectors and optical logic gates.

Main Results:

  • High-quality CdS1-xSex nanowires with tunable green-to-red PL emissions.
  • Photodetectors achieved a high on/off ratio (103), responsivity (89 A/W), and detectivity (1.06 × 1013 Jones).
  • Successfully implemented optical-controlled "AND" and "OR" logic gates and optical communication systems.

Conclusions:

  • Bandgap-gradient CdS1-xSex nanowires show great potential for optoelectronic applications.
  • On-nanowire bandgap modulation offers a pathway for multifunctional nanophotonic devices.
  • The developed technology provides effective solutions for secure optical communication and encryption.