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Optically Programmable Circularly Polarized Photodetector.

Can Zhang1,2, Chenyin Xu1, Cuifen Chen1

  • 1National Engineering Lab of Special Display Technology, State Key Lab of Advanced Display Technology, Academy of Optoelectronic Technology, Hefei University of Technology, Hefei 230009, China.

ACS Nano
|August 8, 2022
PubMed
Summary
This summary is machine-generated.

This study presents an optically programmable circularly polarized light (CPL) photodetector using achiral F6BT and P3HT films. The device achieves switchable detection of left- and right-handed CPL, enabling advanced imaging and anticounterfeiting applications.

Keywords:
chiral inductioncircularly polarized detectionoptically programmablephototransistorswitchable detection

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Photonics

Background:

  • Conventional circularly polarized light (CPL) photodetectors face challenges in achieving sign inversion and miniaturization due to chiral layer limitations.
  • Developing tunable CPL detection is crucial for integrated photonic devices.

Purpose of the Study:

  • To fabricate an optically programmable CPL photodetector with switchable detection capabilities.
  • To leverage CPL-induced chirality in achiral materials for enhanced photodetector performance.
  • To demonstrate the potential of CPL photodetectors in imaging and anticounterfeiting.

Main Methods:

  • Fabrication of a CPL photodetector utilizing achiral poly(9,9-di-n-hexylfluorene-alt-benzothiadiazole) (F6BT) and poly(3-hexylthiophene) (P3HT) films.
  • Exploiting CPL-induced chirality characteristics of F6BT and the properties of P3HT for device operation.
  • Demonstrating switchable detection of left-handed CPL (L-CPL) and right-handed CPL (R-CPL) by controlling F6BT chirality.

Main Results:

  • The fabricated device exhibited excellent discrimination between left- and right-handed CPL.
  • A maximum anisotropy factor of responsivity of 0.425 was achieved.
  • Switchable detection of L-CPL and R-CPL was successfully realized by controlling the chirality of F6BT.
  • A CPL photodetector array demonstrated image processing and cryptographic functionalities.

Conclusions:

  • The proposed optically programmable CPL photodetector offers a novel approach for tunable CPL detection.
  • The device's ability to switch detection based on CPL handedness opens avenues for advanced applications.
  • This technology holds promise for photonics, sensing, imaging, and anticounterfeiting applications.