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A layered Janus metastructure for multi-physical quantity detection based on the second harmonic wave.

Yu-Xin Wei1, Jun-Yang Sui1, Chuan-Qi Wu1

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This study introduces a novel nonlinear Janus metastructure (NJMS) for multi-physical quantity detection using second harmonic waves (SHW). The NJMS achieves highly sensitive terahertz detection of refractive indices, thicknesses, and angles with Janus properties.

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Area of Science:

  • Nonlinear optics
  • Metamaterials
  • Physical quantity detection

Background:

  • Current research on second harmonic wave (SHW) applications is limited to single physical quantity detection.
  • Existing methods lack versatility in application scenarios.

Purpose of the Study:

  • To propose a novel nonlinear Janus metastructure (NJMS) for multi-functional detection.
  • To exploit SHW for highly sensitive terahertz (THz) detection with Janus properties.

Main Methods:

  • Utilizing SHW generated in ferroelectric crystals.
  • Designing a multi-functional nonlinear Janus metastructure (NJMS).
  • Operating in the terahertz frequency range.

Main Results:

  • The NJMS demonstrates Janus properties, functioning differently in forward and backward directions.
  • Highly sensitive detection of refractive indices, thicknesses, and angles was achieved.
  • Different detection modes were realized for forward and backward propagation.

Conclusions:

  • The proposed NJMS broadens the application scope of SHW.
  • This work offers a new approach for developing multi-physical quantity detection devices with Janus properties.