In conventional optical sensing, there is a tradeoff between the device size and sensitivity. This is because of the small interaction between light and matter. By means of a microcavity system, which can confine light in a small volume, we can accomplish small size and high sensitivity simultaneously.

We are developing a compact terahertz polarization imaging system for industrial applications. We would like to discuss potential applications by using the precise terahertz polarization sensing system.

A 3-micron spectrometer has been developed for high-resolution, sensitive molecular spectroscopy. Efficient difference-frequency generation in a waveguide-type device, enhancement of the optical field and effective pass length in a cavity absorption cell, and frequency control by an optical frequency comb allow us to observe spectral lines with a resolution of 10^9 and to determine the central frequency with an uncertainty of 10^11.

We introduce several electrochemical applications of boron-doped diamond electrodes such as electrochemical sensors, waste water treatment, CO2 reduction, and novel organic synthesis.

A label-free cell sorter is an effective tool for cell therapy and regenerative medicine. We will introduce a new on-chip cell sorter using dielectrophoresis.

Light propagation in biological tissues, which cannot be measured by experiments, is analyzed by simulations. The results are applied to non-invasive optical diagnostics such as functional near-infrared optical brain imaging.

Non-destructive evaluation, detecting cracks or material degradation in structures, and identifying detachment in composite materials, have now become important for maintenance of industrial technology. Our laboratory is studying ultrasonic testing, including electromagnetic acoustic transducers for noncontact inspection, guided waves for inspecting long structures, and nonlinear ultrasonics for identifying closed cracks.

We consider smart communities including various infrastructures and devices as smart sensor-actuator networks. Energy-efficient and low-latency communication technologies towards smart communities are presented.

Secure routing and multi-hop communication are required in mobile ad-hoc networks. We investigate routing and media-access control schemes to reduce power consumption and to ensure high real-time network reliability and throughput.

We are developing FPGA-based hardware accelerators for various NOSQL storages that cover key-value store, column store, and graph database.