Naoya Toda

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The phase transition of sashlike polydiacetylene (PD) atomic sash in an extrathin (0.4 nm) vapor-deposited monolayer on a graphite (0001) surface has been observed by in-situ scanning tunneling microscopy (STM). The conformation of the atomic sash composed of a row of lying alkyl chains stitched up with a PD chain is different around the crossing points of(More)
The fast and effective generation of a concentration gradient by mixing in the microchannel is important for many microfluidic applications. The active control of gradient is useful for applying the measurement of cell responses by dynamic change of environment. The main purpose of this paper is the generation of temporally stable concentration gradient(More)
We report a novel approach towards realizing a high directionality in the emission of a light-emitting diode (LED) by employing the evanescent wave coupling effect in a small ridge or truncated cone structure. We fabricated an InGaAs/GaAs LED in which a stripe-shaped InGaAs/GaAs quantum well with a stripe width of about 100 nm is embedded at the center of a(More)
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