Terahertz beam steering and variable focusing using programmable diffraction gratings

Yasuaki Monnai, Kristian Altmann, Christian Jansen, Hartmut Hillmer, Martin Koch, Hiroyuki Shinoda

研究成果: Article査読

53 被引用数 (Scopus)

抄録

We propose a freely programmable THz diffraction grating based on an electrostatically actuated, computer controlled array of metallic cantilevers. Switching between different grating patterns enables tailoring spatio-temporal profiles of the THz waves. By characterizing the device with spatially resolved THz time domain spectroscopy, we demonstrate beam steering for a wide frequency band extending from 0.15 THz to 0.9 THz. The steerable range at 0.3 THz exceeds 40°. Focusing is also demonstrated by programming a chirped grating. The proposed approach could be employed to mimic arbitrary diffraction optics, enabling highly integrated and extremely flexible systems indispensable for THz stand-off imaging and communications.

本文言語English
ページ(範囲)2347-2354
ページ数8
ジャーナルOptics Express
21
2
DOI
出版ステータスPublished - 2013 1 28
外部発表はい

ASJC Scopus subject areas

  • 原子分子物理学および光学

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