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 journalArticle

38 Citations (Scopus)

Abstract

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
Volume21
Issue number2
DOIs
Publication statusPublished - 2013 Jan 28
Externally publishedYes

Fingerprint

beam steering
gratings (spectra)
gratings
diffractive optics
programming
communication
profiles
spectroscopy

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Terahertz beam steering and variable focusing using programmable diffraction gratings. / Monnai, Yasuaki; Altmann, Kristian; Jansen, Christian; Hillmer, Hartmut; Koch, Martin; Shinoda, Hiroyuki.

In: Optics Express, Vol. 21, No. 2, 28.01.2013, p. 2347-2354.

Research output: Contribution to journalArticle

Monnai, Y, Altmann, K, Jansen, C, Hillmer, H, Koch, M & Shinoda, H 2013, 'Terahertz beam steering and variable focusing using programmable diffraction gratings', Optics Express, vol. 21, no. 2, pp. 2347-2354. https://doi.org/10.1364/OE.21.002347
Monnai, Yasuaki ; Altmann, Kristian ; Jansen, Christian ; Hillmer, Hartmut ; Koch, Martin ; Shinoda, Hiroyuki. / Terahertz beam steering and variable focusing using programmable diffraction gratings. In: Optics Express. 2013 ; Vol. 21, No. 2. pp. 2347-2354.
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