Enantiomeric switching of chiral metamaterial for terahertz polarization modulation employing vertically deformable MEMS spirals

Tetsuo Kan, Akihiro Isozaki, Natsuki Kanda, Natsuki Nemoto, Kuniaki Konishi, Hidetoshi Takahashi, Makoto Kuwata-Gonokami, Kiyoshi Matsumoto, Isao Shimoyama

Research output: Contribution to journalArticle

92 Citations (Scopus)

Abstract

Active modulation of the polarization states of terahertz light is indispensable for polarization-sensitive spectroscopy, having important applications such as non-contact Hall measurements, vibrational circular dichroism measurements and anisotropy imaging. In the terahertz region, the lack of a polarization modulator similar to a photoelastic modulator in the visible range hampers expansion of such spectroscopy. A terahertz chiral metamaterial has a huge optical activity unavailable in nature; nevertheless, its modulation is still challenging. Here we demonstrate a handedness-switchable chiral metamaterial for polarization modulation employing vertically deformable Micro Electro Mechanical Systems. Vertical deformation of a planar spiral by a pneumatic force creates a three-dimensional spiral. Enantiomeric switching is realized by selecting the deformation direction, where the polarity of the optical activity is altered while maintaining the spectral shape. A polarization rotation as high as 28° is experimentally observed, thus providing a practical and compact polarization modulator for the terahertz range.

Original languageEnglish
Article number8422
JournalNature communications
Volume6
DOIs
Publication statusPublished - 2015 Oct 1
Externally publishedYes

Fingerprint

Micro-Electrical-Mechanical Systems
Optical Rotation
polarization modulation
Metamaterials
microelectromechanical systems
MEMS
Spectrum Analysis
Modulation
Polarization
Functional Laterality
Anisotropy
polarization
modulators
Circular Dichroism
Modulators
optical activity
Light
modulation
handedness
Spectroscopy

ASJC Scopus subject areas

  • Chemistry(all)
  • Biochemistry, Genetics and Molecular Biology(all)
  • Physics and Astronomy(all)

Cite this

Enantiomeric switching of chiral metamaterial for terahertz polarization modulation employing vertically deformable MEMS spirals. / Kan, Tetsuo; Isozaki, Akihiro; Kanda, Natsuki; Nemoto, Natsuki; Konishi, Kuniaki; Takahashi, Hidetoshi; Kuwata-Gonokami, Makoto; Matsumoto, Kiyoshi; Shimoyama, Isao.

In: Nature communications, Vol. 6, 8422, 01.10.2015.

Research output: Contribution to journalArticle

Kan, Tetsuo ; Isozaki, Akihiro ; Kanda, Natsuki ; Nemoto, Natsuki ; Konishi, Kuniaki ; Takahashi, Hidetoshi ; Kuwata-Gonokami, Makoto ; Matsumoto, Kiyoshi ; Shimoyama, Isao. / Enantiomeric switching of chiral metamaterial for terahertz polarization modulation employing vertically deformable MEMS spirals. In: Nature communications. 2015 ; Vol. 6.
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AU - Konishi, Kuniaki

AU - Takahashi, Hidetoshi

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