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Hybrid integration of GaN and Si photonic devices is promising. Using a polymer bonding technique, GaN microring resonators are fabricated on Si substrate. Transmission characteristics of the GaN microring is measured.
In this study, zero CO2 emission high efficiency power generation system based on Magnetohydrodynamic (MHD) generator was proposed. Proposed system was driven by combustion product of fossil fuels burned with pure oxygen. Such combustion system has inherent advantages as 1) high temperature combustion gas and 2) simple components of combustion gas. The former has possibility to achieve high thermal...
Ultrashort pulse fiber lasers (FLs) are required to have higher power to achieve high quality laser processing of difficult-to-cut materials such as carbon fiber reinforced plastics (CFRPs). Our present work develops an all-fiber coherent addition system to achieve a high power ultrashort pulse FL beyond pulse-power limits due to nonlinear effects in rare-earth-doped fiber [1]. Coherent addition is...
A confocal laser displacement sensor using a micro-machined varifocal mirror is reported. The focal length modulation is a key function for the sensor. The measurement speed and range depend on the mechanism. In this study, we propose to use the micro-machined varifocal mirror for the mechanism of the focal length modulation in the confocal displacement sensor. The electrostatically actuated varifocal...
Gas cluster ion beam (GCIB) was used for surface activation bonding (SAB). Since GCIB modifies only near surface, low-damage surface modification and activation are expected. In this study, Cu-Cu bonding with GCIB irradiation was selected as a preliminary study. XPS and contact angle measurement showed that surface oxide on Cu was removed efficiently by oblique incidence Ar-GCIB at 5–20 kV. Also,...
Improving the output of current-perpendicular-to-plane giant magnetoresistance (CPP-GMR) sensor has been the central issue to meet the requirements for next generation read sensors.
A series-hybrid variable flux memory (VFM) machine employing two different kinds of permanent magnets (PMs) on alternate rotor poles is investigated. This machine features controllable PM flux and good flux-weakening capability, as well as improved torque density. However, the unipolar end leakage flux occurs when the fluxes produced by two different kinds of PMs are not balanced. Therefore, the series...
High efficiency of electric vehicles and hybrid electric vehicles originates from permanent-magnet synchronous motors, which use high-coercivity Nd-Fe B sintered magnets [1].
PTSIM is a particle therapy system simulation framework based on Geant4 Monte Carlo simulation toolkit. It was originally developed as a reliable dose calculation tool to verify dose distributions inside patient and dose calculation algorithms in treatment planning systems. Besides such a reliable dose calculation, an irradiation field monitoring is desirable for delivering dose with more ideal distribution...
We propose an eyeglasses-type retinal imaging system using MEMS scanner. The laser scanning confocal measurement system is incorporated in the glasses frame. The two dimensional electromagnetic MEMS scanner is used. The obtained image of the fundus of model eye using the instrument is also presented.
Variable functional devices using MEMS/NEMS actuators are attractive to reconfigurable densely integrated optical circuits in silicon photonics, especially in optical telecommunication. Here, some silicon photonic waveguide devices, which are variable by integrated in-plane actuators, are presented. Coupler switches and wide-range tunable micro rings are discussed.
This paper shows a fabrication process and device characteristics of the tunable monocrystalline silicon grating on LSI circuit. The thin monocrystalline silicon with thickness of 260 nm was transferred on the LSI circuit, by using the two-step polymer bonding process consisting of polymer patterning and bonding, and liquid-polymer filling. Furthermore, the grating was fabricated on the LSI circuit...
Particle therapy system simulation framework, PTSIM, is a simulation framework based on Geant4 Monte Carlo simulation. It has been originally developed for particle radiotherapy to simulate dose distribution inside patient. PTSIM has provided a common platform to model proton and ion therapy facilities, allowing users who are not Geant4 experts to accurately and efficiently run Geant4 simulations...
Particle therapy system simulation framework, PTSIM, is a simulation framework based on Geant4 Monte Carlo simulation. It has been originally developed for particle radiotherapy to simulate dose distribution inside patient. PTSIM has provided a common platform to model proton and ion therapy facilities, allowing users who are not Geant4 experts to accurately and efficiently run Geant4 simulations...
SDN-driven effective defragmentation technique on Multi Core Fiber is demonstrated. High speed integrated dual output intensity modulator switch is utilized for core adaptation in combination with hitless frequency shift, showing quasi hitless reconfiguration performance.
An electrostatically actuated resonant varifocal mirror with a piezoresistive displacement sensor is reported. The focal length of the varifocal mirror is monitored by the sensor. The device is fabricated from a silicon-on-insulator wafer and a glass wafer. The p-type silicon region which is formed in n-type top silicon layer by boron ion implantation is used as the piezoresistive displacement sensor...
A working small-footprint asymmetrically and vertically coupled hybrid Si/GaN microring resonator (HMR) was demonstrated. The HMR of a minimum radius of 20 $\mu\hbox{m}$ was fabricated in a high-yield ( $\sim$90%) hybrid nanophotonic platform that allowed interactions between the GaN microring and the underlying Si waveguide circuit. The HMR's spectral response across the telecommunication C- and...
We present a fabrication process and characteristics of tunable submicron-thick monocrystalline silicon grating for integration of LSI wafer. The grating structure was successfully fabricated. The ribbon of the grating was successfully actuated. The rise time of step response was about 20 µs.
We report a large-amplitude resonant varifocal mirror with an acoustic cavity under atmospheric pressure. The amplitude of resonant varifocal mirror with acoustic cavity was measured by changing the cavity length. The amplitude of varifocal mirror was changed periodically depending on the cavity length. The period is in excellent agreement with the half of calculated wavelength of the acoustic wave...
Combination of GaN devices with Si devices is promising for the future hybrid integration in optical MEMS such as embedded light sources with electronic circuits. However, GaN optical waveguides are not directly formed on Si substrate because the refractive index of GaN is lower than that of Si. In this research, a GaN layer is grown epitaxially on a Si substrate and GaN freestanding waveguides are...
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