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Related Concept Videos

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences01:17

NMR Spectrometers: Radiofrequency Pulses and Pulse Sequences

885
A pulse is a short burst of radio waves distributed over a range of frequencies that simultaneously excites all the nuclei in the sample. Upon passing a radio frequency pulse along the x-axis, the nuclei absorb energy corresponding to their Larmor frequencies and achieve resonance. This shifts the net magnetization vector from the z-axis toward the transverse plane. This angle of rotation of the magnetization vector, or the flip angle, is proportional to the duration and intensity of the pulse.
885

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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Terahertz Pulse Generation with Binary Phase Control in Nonlinear InAs Metasurface.

Hyunseung Jung1,2, Lucy L Hale3, Sylvain D Gennaro1,2

  • 1Sandia National Laboratories, Albuquerque, New Mexico 87123, United States.

Nano Letters
|November 11, 2022
PubMed
Summary

Researchers developed a novel nonlinear indium arsenide (InAs) metasurface for generating and structuring terahertz (THz) beams simultaneously. This breakthrough enhances THz spectroscopy and imaging capabilities by controlling THz pulse properties at the source.

Keywords:
metasurfacenanofabricationnonlinear opticsspectroscopyterahertz

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Area of Science:

  • Optics and Photonics
  • Materials Science
  • Spectroscopy

Background:

  • Terahertz (THz) pulse generation is crucial for broadband coherent spectroscopy and imaging.
  • Current THz pulses often lack spatial structure, limiting advanced applications.
  • Structured beams are increasingly vital for sophisticated spectroscopy.

Purpose of the Study:

  • To develop a method for simultaneous generation and spatial structuring of THz beams.
  • To explore the use of nonlinear optical metasurfaces with nanoscale emitters for THz beam control.
  • To demonstrate a platform for creating binary-phase THz metasurfaces.

Main Methods:

  • Fabrication of a nonlinear indium arsenide (InAs) metasurface with nanoscale optical resonators.
  • Utilizing optical rectification for THz pulse generation within the resonators.
  • Characterization of THz pulse generation efficiency, polarity, and amplitude control.

Main Results:

  • The InAs metasurface simultaneously generates and structures THz beams efficiently.
  • Optical rectification in InAs resonators is more efficient than in traditional ZnTe crystals.
  • Demonstrated control over THz pulse polarity and amplitude, enabling binary-phase metasurfaces.
  • Successfully demonstrated an InAs metalens for simultaneous THz pulse generation and focusing.

Conclusions:

  • The developed InAs metasurface offers a novel platform for engineered THz beam generation and structuring.
  • This technology advances THz spectroscopy and imaging by enabling precise control over spatiotemporal beam properties.
  • The findings pave the way for new THz beam engineering applications.