A5100386913- Photonic and Optical Devices
- Semiconductor Lasers and Optical Devices
- Optical Network Technologies
- Advanced Photonic Communication Systems
- Photonic Crystals and Applications
- Nematode management and characterization studies
- Semiconductor Quantum Structures and Devices
- Soybean genetics and cultivation
- Plant Water Relations and Carbon Dynamics
- Plant responses to elevated CO2
- Optical Coatings and Gratings
- Legume Nitrogen Fixing Symbiosis
- Advanced Fiber Laser Technologies
- Photosynthetic Processes and Mechanisms
- Advanced Fiber Optic Sensors
- Fern and Epiphyte Biology
- Advanced Optical Network Technologies
- Advanced Semiconductor Detectors and Materials
- RFID technology advancements
- Remote Sensing in Agriculture
- Rice Cultivation and Yield Improvement
- Smart Parking Systems Research
- Quantum Dots Synthesis And Properties
- Spectroscopy and Chemometric Analyses
- Plasmonic and Surface Plasmon Research
Fujitsu (Japan)
2012-2024
Kurume University
2023-2024
Okayama University
2023-2024
Kyoto University
2013-2023
Fujitsu (China)
2019-2023
Hiroshima University
2021-2023
Fujitsu (United States)
2023
Photonics Electronics Technology Research Association
2013-2022
Hamamatsu University School of Medicine
1999-2022
Kitasato University
2013-2021
Photosynthetic rate is determined by CO2 fixation and entry into the plant through pores in leaf epidermis called stomata. However, effect of increased stomatal density on photosynthetic remains unclear. This work investigated alteration capacity Arabidopsis thaliana. Stomatal was modulated overexpressing or silencing STOMAGEN, a positive regulator development. Leaf growth were examined transgenic plants. Increased STOMAGEN-overexpressing plants enhanced 30% compared to wild-type Transgenic...
We demonstrated a novel two-dimensional photonic crystal (PC) based Symmetric Mach Zehnder type all-optical switch (PC-SMZ) with InAs quantum dots (QDs) acting as nonlinear phase-shift source. The 600- ?m-long PC-SMZ having integrated wavelength-selective PC-based directional couplers and other PC components exhibited 15-ps-wide switching-window 2-ps rise/fall time at wavelength of 1.3 ?m. Nonlinear optical phase shift in the 500-?m-long straight waveguide was also achieved sufficiently low...
An Si/III-V hybrid laser oscillating at a single wavelength was developed for use in large-scale Si optical I/O chip. The had an InP-based reflective semiconductor amplifier (SOA) chip integrated with wavelength-selection-mirror flip-chip configuration. A low coupling loss of 1.55 dB the Si-SOA interface accomplished by both mode-field-matching between waveguides and accurately controlling bonding position. fabricated exhibited very threshold current 9.4 mA, high output power 15.0 mW,...
Stomatal density (SD) is closely associated with photosynthetic and growth characteristics in plants. In the field, light intensity can fluctuate drastically within a day. The objective of present study to examine how higher SD affects stomatal conductance (gs) CO2 assimilation rate (A) dynamics, biomass production water use under fluctuating light. Here, we compared constant among three lines Arabidopsis thaliana (L.): wild type (WT), STOMAGEN/EPFL9-overexpressing line (ST-OX), EPIDERMAL...
Crop leaves are subject to continually changing light levels in the field. Photosynthetic efficiency of a crop canopy and productivity will depend significantly on how quickly leaf can acclimate change. One measure speed response is rate photosynthesis increase toward its steady state transition from low high light. This was measured for seven genotypes soybean [Glycine max (L.) Merr.]. After 10 min illumination, cultivar 'UA4805' (UA) had achieved photosynthetic (Pn ) 23.2 μmol · m(-2)...
Straight single-line-defect photonic crystal (PC) waveguides on GaAs slabs with lengths of 1, 4, and 10 mm have been fabricated. By controlling the Al content a sacrificial AlGaAs clad layer wet etching duration, PC core very smooth surface was obtained. Atomic force microscope images indicate that roughness top is less than 1 nm. An extremely low propagation loss 0.76 dB/mm for GaAs-based waveguide achieved.
Leaves within crop canopies experience variable light over the course of a day, which greatly affects photosynthesis and productivity. Little is known about mechanisms photosynthetic response to fluctuating their genetic control. Here, we examined gas exchange, metabolite levels, chlorophyll fluorescence during induction in an Oryza sativa indica cultivar with high yield (Takanari) japonica lower (Koshihikari). Takanari had faster sudden increases intensity than Koshihikari, as demonstrated...
Rice ( Oryza sativa L.) is one of the most important cereals, which provides 20% world’s food energy. However, its productivity poorly assessed especially in global South. Here, we provide a first study to perform deep-learning-based approach for instantaneously estimating rice yield using red-green-blue images. During ripening stage and at harvest, over 22,000 digital images were captured vertically downward canopy from distance 0.8 0.9 m 4,820 harvesting plots having 0.1 16.1 t·ha −1...
We report superior spectral characteristics of silicon-nanowire-based 5th-order coupled resonator optical waveguides (CROW) fabricated by 193-nm ArF-immersion lithography process on a 300-mm silicon-on-insulator wafer. theoretically analyze characteristics, considering random phase errors caused micro fabrication process. It will be experimentally demonstrated that the devices exhibit low excess loss 0.4 ± 0.2 dB, high out-of-band rejection ratio >40dB, and wide flatband width ~2 nm....
We report good phase controllability and high production yield in Si-nanowire-based multistage delayed Mach-Zehnder interferometer-type optical multiplexers/demultiplexers (MUX/DeMUX) fabricated by an ArF-immersion lithography process on a 300 mm silicon-on-insulator (SOI) wafer. Three kinds of devices this work exhibit clear 1×4 Ch wavelength filtering operations for various frequency spacing. These results are promising their applications high-density division multiplexing-based interconnects.
A highly power-efficient silicon (Si) photonic PAM4 transmitter was developed by integrating a Si segmented Mach- Zehnder modulator and CMOS driver chip. p-i-n-type phase shifters are directly driven with inverter array to realize low power operation. passive RC equalizing technique adopted extend the modulation bandwidth up 20 GHz while maintaining consumption. By filter within photonics chip, we achieved very compact foot print for (450 × 950 μm). The fabricated exhibited VπL of 0.19 V·cm...
Abstract The stomatal density (SD) can be a promising target to improve the leaf photosynthesis in soybeans ( Glycine max (L.) Merr). In conventional SD evaluation, counting process of stomata during manual operation time-consuming. We aimed develop high-throughput technique for evaluating and elucidating variation among various soybean accessions. central leaflet first trifoliolate was sampled, microscopic images replica were obtained 90 Single Shot MultiBox Detector, an algorithm object...
The discovery of causal relationships from observed data has attracted significant interest disciplines such as economics, social sciences, epidemiology, and biology. In practical applications, considerable knowledge the underlying systems is often unavailable, real are associated with nonlinear structures, which make direct use most conventional causality analysis methods difficult. This study proposes a novel quantum Peter-Clark (qPC) algorithm for that does not assume any model...
High temperature (>;125°C) resistant semiconductor lasers are attractive as light sources in a variety of harsh environments. Long-wavelength operating under higher more than 200°C combined with silica-based optical fibers can expand application fields data transmission and sensing to severe environments like space or deep underground. Temperature dependence the threshold current laser be drastically reduced by employing quantum-dot (QD) active layers. Recent progress epitaxial growth...
Drought stress is a major limiting factor for crop growth and yield. Water availability in the field can cyclically change between drought rewatering conditions, depending on precipitation patterns. Concurrently, light intensity under conditions fluctuate, inducing dynamic photosynthesis transpiration during period. The present study aimed to characterize carbon gain water use fluctuating two crops, namely rice soybean. We conducted gas exchange measurements with soybean plants exposed...
Two-dimensional (2-D) photonic crystal (PC) directional couplers (DCs) that have a triangular lattice pattern of air holes in planar dielectric slab are theoretically and experimentally analyzed. Unlike the 2-D PC DC structure with rod air, which is frequently used theoretical studies, more practical DCs tend to be multimode nature exhibit large group velocity dispersion, thus creating decoupling points dispersion relation without any additional modifications structure. The lead interference...
Takuran is a traditional herbal medicine that produced from the plant Lycopus lucidas TURCZ. (Lamiaceae). used as treatment for diseases in women. From Takuran, four new phenylpropanoids along with 18 known compounds were isolated, and their structures elucidated by spectroscopic analyses. Five isolated showed hyaluronidase inhibitory activity comparable to of rosmarinic acid.
Cyst and root-knot nematodes are major risk factors of agroecosystem management, often causing devastating impacts on crop production. The use microbes that parasitize or prey has been considered as a promising approach for suppressing phytopathogenic nematode populations. However, effects persistence those biological control agents vary substantially depending regions, soil characteristics agricultural practices: more insights into microbial community processes required to develop...
An optical digital-to-analog converter (DAC) is a promising solution for the efficient generation of multilevel modulation signals without high-speed electrical DAC and large swing linear driver. We report design characterization an all-Si segmented Mach-Zehnder modulator transmitter. The comprises forward-biased positive intrinsic negative (PIN) phase shifter integrated with passive resistance capacitance (RC) equalizer (PIN-RC) to optimize tradeoff between efficiency analog bandwidth....