Terahertz beam steering and variable focusing using programmable diffraction gratings

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

Research output: Contribution to journalArticlepeer-review

74 Citations (Scopus)


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.

Original languageEnglish
Pages (from-to)2347-2354
Number of pages8
JournalOptics Express
Issue number2
Publication statusPublished - 2013 Jan 28
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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