Shuko Kobayashi

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In a volumetric optical disc medium, two counter-propagating light beams focusing to the same point create a diffraction-limited size micro-reflector. We propose a single-sided optical layout for a three-dimensional optical disc recording system using the micro-reflectors. Calculation results of readout signal characteristics, estimation of interlayer(More)
The electrical response of 2nS:Mn alternating-current thin-film electroluminescent devices grown by atomic layer epitaxy (ALE) is studied by systematically varying the characteristics of the standard driving waveform. Charge-voltage, capacitance-voltage, and internal charge-phosphor field analysis are used to accomplish electrical analysis. The turn-on(More)
A coaxial type holographic data storage evaluation system, capable of 500-fps-consecutive writing and reading, has been developed, whose light source is a semiconductor blue laser diode. This is realized by an image-stabilizing technique. 1. Introduction The coaxial type holographic storage system [1], which has the signal beam arranged surrounded by the(More)
Here we present a newly developed wideband quadrature frequency resolved spectroscopy (QFRS) allowing analysis of photoluminescence (PL) lifetime over almost 11 decades (2 ns to 160 s). The system consists of dual phase double lock-in (DPDL) QFRS for lifetimes from ns to mus and internal mode QFRS for longer lifetime up to 160 s. The QFRS results of(More)
We have proposed a new recording method called groove base recording (GBR). In GBR the effect of intersymbol interference (ISI) is removed by a digital modulation such as QAM. The resultant analog waveform of the digital modulation is emboss recorded by a wobble of groove walls. Our preliminarily experiment suggested that we can achieve 1.5 times higher(More)
Virtually all modulation methods developed for optical disk systems are designed in the same way as communication systems. Namely, the modulated output is always considered as a 1-D signal stream, even though the recorded signals on the disc form 2-D pit-patterns. We propose a novel recording method which utilizes the 2-D nature of optical disks. With this(More)
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