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We report on the nonlinear magnetization dynamics of a HoFeO3 crystal induced by a strong terahertz magnetic field resonantly enhanced with a split ring resonator. The terahertz magnetic field induces a large magnetization change of 40% of the spontaneous magnetization. The frequency of the antiferromagnetic resonance decreases in proportion to the square of the magnetization change.
We fabricated ridge waveguides in ion-sliced LiNbÜ3 by accelerated chemical etching in the proton-exchanged region. We obtained the low-loss waveguides of 0.7 mm2 cross-sectional area. Strongly confined guided modes were obtained at 1.55 mm wavelength.
The use of depth of interaction (DOI) detectors is one effective technique to improve the spatial resolution of whole-body PET imaging. We have developed a whole-body PET system with DOI detectors that achieves less than 3 mm (FWHM) uniform spatial resolution, independent of the radial position in the transaxial field of view. On the other hand, improvements in sensitivity and noise equivalent count...
On a PET scanner consisting of block detectors, coincidence responses to scattered radiation may differ from those to trues depending on the crystal pair position within a coincidence block pair. Furthermore, these differences are considered to vary according to the radial position of the coincidence block pair. In component-based normalization, a scatter-compensated geometrical component is therefore...
We propose a novel technique for the generation of high power monocycle terahertz pulse beyond the excitation pulse width limitation. Optical pulse may get modulated by emitted intense THz electric field. This causes excitation pulse compression and consequently gives rise to the enhancement of generation efficiency and its bandwidth. We experimentally demonstrate this chi(2) cascaded processes using...
We performed THz time-domain attenuated total reflection spectroscopy of arginine and sucrose solution, and verified that this method gives us reasonable hydration numbers.
Ni-Zn-ferrite thin films were formed on glass substrate by a laser ablation method employing a KrF excimer laser at wave-length 248 nm and frequency 15 Hz. Film was deposited on substrate at room temperature, 200??C and 350??C, to a thickness of 2 ??m. Ni-Zn-ferrite films thus prepared had the spinel structure when the substrate temperature was raised to 200??C. The saturation magnetic flux densities...
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