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Microparticle Manipulation by Standing Surface Acoustic Waves with Dual-frequency Excitations
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Surface wave manipulation by plasmonic metasurface based on mode resonance.

Baoshan Guo1

  • 1Laser Micro/Nano Fabrication Laboratory, School of Mechanical Engineering, Beijing Institute of Technology, Beijing, 100081, China. gbs@bit.edu.cn.

Scientific Reports
|February 9, 2021
PubMed
Summary

We demonstrate a novel method to control terahertz (THz) surface waves using deep subwavelength metasurfaces. This technique enables efficient manipulation and enhancement of THz wave propagation with compact devices.

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Area of Science:

  • Metasurfaces
  • Terahertz (THz) photonics
  • Wave manipulation

Background:

  • Surface waves, particularly terahertz (THz) surface waves, are crucial for integrated photonic devices.
  • Controlling these waves at deep subwavelength scales presents significant challenges.
  • Existing methods often lack efficiency or require complex structures.

Purpose of the Study:

  • To propose and validate a method for manipulating surface terahertz (THz) waves using deep subwavelength metasurfaces.
  • To explore the use of interfering mode resonance within resonators for wave control.
  • To demonstrate the potential for creating compact and efficient THz devices.

Main Methods:

  • Utilizing a single deep subwavelength obstructed groove as a resonator.
  • Applying interfering mode resonance between surface spoof plasmonics modes and groove cavity modes.
  • Simulating the control of surface wave propagation via small changes in groove depth or refractive index.

Main Results:

  • A single deep subwavelength groove effectively controls THz surface wave propagation with minimal changes in depth or refractive index.
  • Periodic control of transmitted and reflected surface waves is achieved with high efficiency.
  • Mode resonance enhances the intensity of transmitted or reflected surface waves.
  • A circular resonance mode is generated, offering new possibilities for THz device design.

Conclusions:

  • The proposed method offers a simple and effective way to manipulate surface THz waves.
  • This approach facilitates the manufacturing of more compact integrated optical devices at the deep subwavelength scale.
  • The findings open new avenues for advanced THz device development and applications.