Shunsuke Yoshimoto

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We present a theoretical analysis of lasing action in photonic crystal surface-emitting lasers (PCSELs). The semiclassical laser equations for such structures are simulated with three different theoretical techniques: exact finite-difference time-domain calculations, an steady-state ab-initio laser theory and a semi-analytical coupled-mode formalism. Our(More)
Surface plasmons are widely interesting due to their ability to probe nanoscale dimensions. To create coherent plasmons, we demonstrate a nanolaser based on a plasmonic bandgap defect state inside a surface plasmonic crystal. A one-dimensional semiconductor-based plasmonic crystal is engineered to have stopbands in which surface plasmons are prohibited from(More)
An important function for a tactile navigation system of a handheld tool, such as a surgical scalpel, is the spatial transparency of the device. This paper proposed a new tactile display that can augment touch sensation at the finger pulps without the need for a stimulator between the tool and the finger pulps. We utilized transcutaneous electrical nerve(More)
Some kinds of substances naturally attract people to touch them. The slurry made from water and starch is one of the haptically fascinating substances, and presents the amusing but mysterious sensation like playing in the mud when you were in childhood. The mysterious haptic sensation comes from the property of the fluid, "dilatancy", which is the change in(More)
Recently, there has been considerable interest in technologies that appropriate human body parts, especially the skin, as an input surface for human-computer interfaces. Since human skin is always available and highly accessible, such on-body touch interfaces enable the control of various systems in ubiquitous environments. An interface utilizing skin as an(More)
Tablet PCs and smartphones rapidly become popular nowadays. People can touch objects on the touch panel display of the tablet PC or smartphone, but only get sensation of touching the surface of the display. Recently, some systems capable of inserting themselves into the display by using retractable stylus have been proposed. <i>Beyond</i> [Lee and Ishii(More)
Hand motion capture is an important yet challenging topic for biomechanics and human computer interaction. We proposed a novel electrical sensing technology for capturing the finger angles from the variation of the wrist shape. The proposed device detects the signal related to the wrist-electrode contact resistances, which change according to the variation(More)
An approach to finger motion capture that places fewer restrictions on the usage environment and actions of the user is an important research topic in biomechanics and humancomputer interaction. We proposed a system that electrically detects finger motion from the associated deformation of the wrist and estimates the finger joint angles using multiple(More)