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Related Experiment Video

Updated: May 14, 2026

The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry
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Terahertz beam steering and variable focusing using programmable diffraction gratings.

Yasuaki Monnai1, Kristian Altmann, Christian Jansen

  • 1Department of Information Physics and Computing, The University of Tokyo, 7-3-1 Hongo Bunkyo-ku, 113-8656 Tokyo, Japan. monnai@alab.t.u-tokyo.ac.jp

Optics Express
|February 8, 2013
PubMed
Summary
This summary is machine-generated.

We developed a programmable terahertz (THz) diffraction grating using computer-controlled metallic cantilevers. This device steers THz beams with wide frequency bands and demonstrates focusing capabilities for advanced imaging and communication systems.

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Area of Science:

  • Terahertz (THz) optics
  • Metamaterials and nanophotonics
  • Optoelectronics

Background:

  • Terahertz (THz) waves offer unique properties for imaging and communication.
  • Current THz optical components often lack flexibility and reconfigurability.

Purpose of the Study:

  • To introduce a freely programmable diffraction grating for dynamic control of THz waves.
  • To demonstrate beam steering and focusing capabilities of the proposed device.

Main Methods:

  • Utilizing an array of electrostatically actuated metallic cantilevers to create programmable grating patterns.
  • Characterizing the device's performance using spatially resolved THz time-domain spectroscopy.

Main Results:

  • Demonstrated wide-band beam steering from 0.15 THz to 0.9 THz.
  • Achieved a steerable range exceeding 40° at 0.3 THz.
  • Successfully demonstrated focusing by programming a chirped grating pattern.

Conclusions:

  • The proposed programmable THz diffraction grating enables dynamic tailoring of THz wave profiles.
  • This technology facilitates highly integrated and flexible THz systems for applications like stand-off imaging and communications.