Application of Terahertz Field Enhancement Effect in Metal Microstructures

Applications of high-field terahertz pulses are attractive in physics and terahertz technology. In this study, two applications related to high-intensity terahertz pulses are demonstrated. The field enhancement effect by subwavelength metallic microstructures is utilized for terahertz excitation mea...

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Bibliographic Details
Published in:Journal of infrared, millimeter and terahertz waves millimeter and terahertz waves, 2016-12, Vol.37 (12), p.1199-1212
Main Authors: Nakajima, M., Kurihara, T., Tadokoro, Y., Kang, B., Takano, K., Yamaguchi, K., Watanabe, H., Oto, K., Suemoto, T., Hangyo, M.
Format: Article
Language:English
Subjects:
Amplification
Arrays
Beams (radiation)
Bolometers
Cholesteric liquid crystals
Classical Electrodynamics
Detectors
Electrical Engineering
Electronic devices
Electronics and Microelectronics
Engineering
Instrumentation
Knife-edge
Liquid crystals
Magnetic fields
Magnetic materials
Microstructure
Precession
Spin dynamics
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Summary:Applications of high-field terahertz pulses are attractive in physics and terahertz technology. In this study, two applications related to high-intensity terahertz pulses are demonstrated. The field enhancement effect by subwavelength metallic microstructures is utilized for terahertz excitation measurement. The spin precession dynamics in magnetic materials was induced by a terahertz magnetic field. Spin precession was amplified by one order of magnitude in amplitude by the enhanced magnetic terahertz field in orthoferrite ErFeO 3 with metal microstructures. The induced spin dynamics was analyzed and explained by LLG-LCR model. Moreover, a detection method for terahertz pulses was developed using a cholesteric liquid crystal at room temperature without any electronic devices. The beam profile of terahertz pulses was visualized and compared to other methods such as the knife edge method using pyroelectric detector and micro-bolometer array. The liquid crystal terahertz imager is very simple and has good applicability as a portable terahertz-sensing card.
ISSN:1866-6892
1866-6906
DOI:10.1007/s10762-016-0323-4