Publications by authors named "K Motohara"
Single-shot optical imaging based on ultrashort lasers has revealed nonrepetitive processes in subnanosecond timescales beyond the recording range of conventional high-speed cameras. However, nanosecond photography without sacrificing short exposure time and image quality is still missing because of the gap in recordable timescales between ultrafast optical imaging and high-speed electronic cameras. Here, we demonstrate nanosecond photography and ultrawide time-range high-speed photography using a spectrum circuit that produces interval-tunable pulse trains while keeping short pulse durations.
View Article and Find Full Text PDFPlatinum-containing macrocycles (platinacycles) have gained attention due to their unique photoelectric properties. In the present study, a novel conjugated platinacycle was synthesized by the dehydrochlorination coupling reaction of a bipyridine dichloroplatinum(II) complex and a 3,6-diethynylcarbazol derivative. The structure of the platinacycle was confirmed by H/C, H-H COSY, HMQC, HMBC, DEPT NMR spectroscopies in conjunction with DFT calculations, IR spectroscopy and MALDI-TOF mass spectrometry.
View Article and Find Full Text PDFArticle Synopsis
- The study introduces a new method called sequentially timed all-optical mapping photography (STAMP) that enhances the number of frames captured without losing pixel resolution by using a slicing mirror in a branched 4f lens system.
- The slicing mirror, crafted with high precision, has 18 different angled facets to separate the laser light path into multiple streams.
- This enhanced STAMP technique was successfully demonstrated by imaging the rapid dynamics of laser ablation, capturing 18 frames at a remarkable rate of 126 billion frames per second, showcasing its potential for studying previously unobserved ultrafast events.
An extended version of cross-bar type addressing technique is developed for three-port electrostatic micro shutters arranged in an arrayed format. A microelectromechanical systems (MEMS) shutter blade suspended by a pair of torsion beams works as a movable electrode that is either attracted upwards to the cover plate to close the aperture or retracted downwards into the through-hole to open it. Tri-state positioning of the shutter-i.
View Article and Find Full Text PDFArticle Synopsis
- * Chrysanthemum morifolium faces challenges in genetic analysis and breeding due to its autohexaploid nature and high genome heterogeneity, prompting the development of a more manageable model strain called Gojo-0 from the diploid C. seticuspe.
- * Gojo-0 is advantageous for genetic studies and breeding as it allows for the isolation of mutants and easier genome analysis, enabling further research and genetic improvements in chrysanthemum cultivars.