Zobrazeno 1 - 10
of 36
pro vyhledávání: '"Yoichi Kawada"'
Autor:
Hiroshi Satozono, Yoichi Kawada, Masayuki Chokai, Hironori Takahashi, Junshi Soeda, Yoshinori Ikeda
Publikováno v:
2020 45th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz).
THz optical elements, typically made of silicon (Si), suffer from large reflection due to the large gap in refractive index at the interface between Si and air. In this research, anti-reflection (AR) coating for THz region using polymer and Si nanopa
Autor:
Takahashi Koji, Koyo Watanabe, Hiroshi Satozono, Yoichi Kawada, Takashi Inoue, Hisanari Takahashi, Hironori Takahashi
Publikováno v:
Optics express. 27(18)
We constructed a system that can generate phase-controlled terahertz (THz) pulses using a fan-out periodically poled lithium tantalate crystal and an optical pulse shaper containing a spatial light modulator. The phase of each THz frequency component
Autor:
Ikufumi Katayama, Yoichi Kawada, Jun Takeda, Hironori Takahashi, Katsumasa Yoshioka, Yusuke Arashida, Atsuhiko Ban
Publikováno v:
EPJ Web of Conferences, Vol 205, p 08007 (2019)
By utilizing terahertz scanning tunneling microscopy (THz-STM) with a carrier envelope phase shifter for broadband THz pulses, we could successfully control the near-field-mediated electron dynamics in a tunnel junction with sub-cycle precision. Meas
Autor:
Hiroshi Satozono, Takashi Yasuda, Yoichi Kawada, Atsushi Nakanishi, Koichiro Akiyama, Hironori Takahashi
Publikováno v:
2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz).
We report novel organic mixed crystals composed of DSTMS and DASC. The THz spectra generated from the mixed crystals showed that absorption around 1 THz was very low compared to that of DAST derivatives. Moreover, the THz spectral range and the inten
Autor:
Yoichi Kawada, Yusuke Arashida, Ikufumi Katavama, Katsumasa Yoshioka, Jun Takeda, Hironori Takahashi
Publikováno v:
2018 43rd International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz).
Complex-refractive indices and the optical axis direction in a birefringent material were simultaneously measured. This technique consists of two parts: first, alternate emission of two kinds of polarized THz pulses, generated by periodic modulation
Autor:
Jun Takeda, Yoichi Kawada, Ikufumi Katayama, Yusuke Arashida, Kuniaki Konishi, Katsumasa Yoshioka, Atsuhiko Ban, Hironori Takahashi
Publikováno v:
Nano letters. 18(8)
Light-field-driven processes occurring under conditions far beyond the diffraction limit of the light can be manipulated by harnessing spatiotemporally tunable near fields. A tailor-made carrier envelope phase in a tunnel junction formed between nano
Publikováno v:
Applied Physics Express. 12:092004
Antireflection coatings for silicon optics that work in the terahertz (THz) band were demonstrated. Highly resistive intrinsic silicon nano-particles produced by the laser pyrolysis method were dispersed in a polymer solution and formed refractive in
Autor:
Hisayoshi Takamoto, Gen Takebe, Mitsuo Hiramatsu, Yoichi Kawada, Koichiro Akiyama, Hironori Takahashi
Publikováno v:
Journal of Pharmaceutical Sciences. 102:4065-4071
Terahertz pulsed spectroscopy has recently been demonstrated to be a novel technique for the investigation of the solid‐state properties of pharmaceutical materials. In this study, we directly measured the crystallinity of a drug suspended in water
Publikováno v:
2016 41st International Conference on Infrared, Millimeter, and Terahertz waves (IRMMW-THz).
A carrier-envelope phase (CEP) shifter for broadband terahertz (THz) pulses was demonstrated. The CEP, the phase of the carrier frequency with respect to the peak of the THz pulses, is a key element in light-matter interactions in high fields, especi
Publikováno v:
Optics letters. 41(5)
We demonstrated controlled shifting of the internal phase of broadband terahertz (THz) pulses. The internal phase of an ultrashort pulse is called the carrier envelope phase (CEP), which is an important parameter in the interaction of few-cycle light