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Electrically Controlled Liquid Crystal Microlens Array Based on Single-Crystal Graphene Coupling Alignment for

Mingce Chen1,2, Qi Shao1,2, Wenda He1,2

  • 1National Key Laboratory of Science & Technology on Multispectral Information Processing, Huazhong University of Science & Technology, Wuhan 430074, China.

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|December 1, 2020
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Summary
This summary is machine-generated.

This study introduces an electrically controlled liquid crystal microlens array using single-crystal graphene for alignment. This novel approach simplifies fabrication and demonstrates effective light control and imaging capabilities.

Keywords:
liquid crystal (LC) deviceplenoptic imagingsingle-crystal graphene (SCG) alignment

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Nanotechnology

Background:

  • Liquid crystals (LCs) are vital electric-optic materials for light control.
  • LC-based devices typically require alignment layers (e.g., polyimide, photoalignment) for molecular structural control.
  • Conventional LC microlens arrays (LCMLAs) involve complex fabrication processes due to these layers.

Purpose of the Study:

  • To propose a novel electrically controlled liquid crystal microlens array (EC-LCMLA).
  • To utilize single-crystal graphene (SCG) for LC molecule alignment, eliminating the need for additional layers.
  • To simplify the fabrication and enhance the performance of LCMLAs.

Main Methods:

  • Fabrication of an EC-LCMLA using a monolayer SCG as a functional electrode.
  • Investigating the SCG coupling alignment effect on LC molecules.
  • Experimental measurement of optical properties, including focal lengths and point spread function (PSF).
  • Integration of the EC-LCMLA with photodetectors for plenoptic imaging.

Main Results:

  • Achieved uniform LC alignment in the EC-LCMLA cell via SCG coupling.
  • Demonstrated good focusing performance across the visible to near-infrared spectrum.
  • Successfully performed plenoptic imaging in Galilean mode.
  • Enabled digital refocusing to generate rendering images.

Conclusions:

  • The proposed SCG-based EC-LCMLA offers a simplified structure and process flow.
  • SCG effectively acts as an alignment layer, ensuring uniform LC molecular orientation.
  • The EC-LCMLA exhibits promising optical properties and imaging capabilities for advanced applications.