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Optically Controlled Terahertz Dynamic Beam Splitter with Adjustable Split Ratio.

Shan Yin1, Dehui Zeng1, Yuting Chen1

  • 1Guangxi Key Laboratory of Optoelectronic Information Processing, School of Optoelectronic Engineering, Guilin University of Electronic Technology, Guilin 541004, China.

Nanomaterials (Basel, Switzerland)
|April 12, 2022
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel optically controlled dynamic beam splitter for terahertz waves. This device allows adjustable split ratios from 1:1 to 15:1, enabling advanced terahertz system applications.

Keywords:
beam splitterdynamicmetasurfaceterahertz

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Area of Science:

  • Optics and Photonics
  • Metamaterials
  • Terahertz Technology

Background:

  • Beam splitters are crucial for controlling electromagnetic wave propagation.
  • Variable split-ratio beam splitters are significant for optical, terahertz, and microwave systems.
  • Existing technologies lack dynamic control over split ratios in the terahertz spectrum.

Purpose of the Study:

  • To propose and demonstrate the first optically controlled dynamic beam splitter with an adjustable split ratio in the terahertz region.
  • To investigate the performance characteristics of such a device, including split ratio, split angle, and underlying physical relationships.
  • To provide theoretical guidance for achieving arbitrary split ratios in beam splitting applications.

Main Methods:

  • Fabrication of a metasurface composed of two sets of reversed phase-gradient supercells.
  • Utilizing a reconfigurable pump laser pattern programmed via a spatial light modulator for optical control.
  • Experimental characterization of the beam splitting performance and split ratio modulation.

Main Results:

  • Demonstration of a dynamic beam splitter operating in the terahertz region.
  • Achieved adjustable split ratios ranging from 1:1 to 15:1.
  • Observed stable split angles of 36° for each beam and an exponential relationship between split ratio and illumination proportion.

Conclusions:

  • The developed metasurface-based beam splitter offers dynamic control over terahertz wave splitting.
  • The device exhibits excellent performance in adjustable split ratio and stable split angles.
  • This technology provides a novel method for developing active functional devices for terahertz systems and communications.