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Switching behavior in Bipolar Junction Transistors (BJTs) is a fundamental aspect utilized in various electronic circuits, particularly for digital logic applications like switches and amplifiers. In a typical switching circuit, a BJT alternates between cut-off and saturation modes, corresponding to the "off" and "on" states, respectively, thus behaving like an ideal switch.
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Terahertz Microfluidic Sensing Using a Parallel-plate Waveguide Sensor
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Actively Tunable Terahertz Switches Based on Subwavelength Graphene Waveguide.

Zhongyi Guo1, Xiaoru Nie2, Fei Shen3

  • 1School of Computer and Information, Hefei University of Technology, Hefei 230009, China. guozhongyi@hfut.edu.cn.

Nanomaterials (Basel, Switzerland)
|August 29, 2018
PubMed
Summary

On-chip graphene devices offer tunable, subwavelength optical switching at 30 THz. These graphene-based optical switches demonstrate effective control for terahertz communication applications.

Keywords:
grapheneoptical switcheswaveguide

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Area of Science:

  • Photonics and Optical Communications
  • Materials Science
  • Nanotechnology

Background:

  • On-chip optical communication technology is rapidly advancing.
  • Graphene's unique properties, including active tunability and subwavelength scale, make it promising for novel photonic devices.
  • Electrical manipulation of graphene's optical response is key to developing active optical components.

Purpose of the Study:

  • To systematically investigate various configurations of graphene-based optical switches at 30 THz.
  • To evaluate the performance of these switches, including Y-branch, X-branch, and multi-output designs.
  • To demonstrate the feasibility of using electrically controlled graphene for terahertz optical switching.

Main Methods:

  • Numerical simulations were employed to analyze the optical response of graphene-based devices.
  • Devices consisted of a graphene monolayer atop a poly(methyl methacrylate) dielectric layer.
  • The electrical manipulation of graphene's optical properties was simulated to control switching states.

Main Results:

  • Simulations confirmed effective manipulation of transmission direction in Y-branch, X-branch, 1x3, 2x3, and 2x4 optical switches.
  • The proposed graphene devices exhibited appropriate ON/OFF ratios, indicating good switching performance.
  • Graphene's electrical tunability was successfully leveraged for switching functionalities at terahertz frequencies.

Conclusions:

  • Graphene-based devices offer a viable platform for terahertz optical switching.
  • The investigated switch configurations demonstrate potential for advanced on-chip optical communication systems.
  • These findings pave the way for new routes in terahertz optical switching technologies.