期刊
NATURE COMMUNICATIONS
卷 6, 期 -, 页码 -出版社
NATURE PUBLISHING GROUP
DOI: 10.1038/ncomms9422
关键词
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资金
- JSPS KAKENHI [26706008]
- Murata Science Foundation
- Photon Frontier Network Program
- KAKENHI [20104001]
- Creation of Innovation Centers for Advanced Interdisciplinary Research Areas Program - Ministry of Education, Culture, Sports, Science, and Technology (MEXT), Japan
- Center of Innovation Program from Japan Science and Technology Agency
- Grants-in-Aid for Scientific Research [26790055, 26706008, 20104001] Funding Source: KAKEN
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 degrees is experimentally observed, thus providing a practical and compact polarization modulator for the terahertz range.
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