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Takahiko Lab
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Using thin films that generate ultrasound to measure and to select.
AboutAbout the lab
Measuring and selecting with sound
The Takahiko Lab researches devices that generate ultrasound and their applications in medical engineering.
Ultrasound is sound with a frequency too high for humans to hear, and it is strongly excited at the natural frequency of a piezoelectric material.
Using piezoelectric thin films, the lab develops sensors that detect disease markers, elements that measure the viscosity of droplets, and high-resolution ultrasonic probes.
The lab aims to carry out research and make things that are truly useful.
Key terms
- Piezoelectric material
- A material that generates electricity when force is applied and deforms when voltage is applied, allowing conversion between electricity and vibration.
- Surface acoustic wave
- A wave that travels near the surface of a solid and is affected by the surface condition and by any liquid in contact with it.
- BAW filter
- A component that passes only the required frequency band by using the resonance of the thickness-direction vibration of a piezoelectric thin film. BAW stands for bulk acoustic wave.
NewsLab news
Professor Takahiko's research group significantly suppressed the thermal conduction of AlN thin films by alloying them with YbN
Professor Takahiko received the Electronics Letters Paper Award from the Institute of Electronics, Information and Communication Engineers
A master's student received the 57th Young Scientist Presentation Award from the Japan Society of Applied Physics
A student in the lab won the Poster Award in the 2023 academic year graduate course "Special Exercise B"
ResearchResearch themes
The lab studies devices that generate ultrasound and their applications in medical engineering. Because ultrasound is strongly excited at the natural frequency of a piezoelectric material, performance depends on which piezoelectric thin film is grown and how. The lab aims for research and manufacturing that are truly useful.
*Illustrative imageAntigen-antibody reaction sensors
The lab develops sensors that detect proteins serving as disease markers from changes in ultrasonic vibration. When an antigen attaches to a nano-sized beam vibrating at its natural frequency, the natural frequency changes, so the antigen concentration can be estimated back from the amount of change. The sensors use piezoelectric thin films that can keep vibrating even in liquid.
*Illustrative imageMicro viscosity sensors
In medicine and biotechnology, there is demand for technology that can measure the viscosity of a very small amount of liquid, about a single drop. The lab studies a technique that measures the viscosity of a droplet from the change in the velocity of surface acoustic waves traveling along the liquid-solid interface. It uses thin films whose polarization direction lies in the plane.
*Illustrative imageUltra-high-sensitivity ultrasonic probes
An acoustic microscope directs focused ultrasound at a component using a probe made of a piezoelectric thin film and an acoustic lens, and images internal defects from the reflected waves. As components become smaller and more layered, the lab works on raising the frequency and sensitivity of the probe, which determine the resolution and clarity of the image.
*Illustrative imageDeveloping materials for BAW filters in smartphones
Smartphones contain many filters that extract only the desired band from among numerous radio frequencies. At the higher frequencies of 5G and beyond, BAW filters, which use the resonance of piezoelectric thin films, are needed, and the lab searches for materials that combine high piezoelectricity with low loss. The lab also aims to standardize a new method for measuring the electromechanical coupling coefficient at the wafer stage.
MembersFaculty
The members of the Takahiko Lab consist of faculty and doctoral, master's, and undergraduate students.As of 2025
- ProfessorTakahiko Takahiko
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “CornstarchCymatics cc” Collin Cunningham / CC BY-SA 3.0 (cropped)
- Antigen-antibody reaction sensors: “Antibody IgG1 surface” Tokenzero / CC BY-SA 4.0 (cropped)
- Micro viscosity sensors: “Runny hunny” Scott Bauer, USDA ARS / Public domain (cropped)
- Ultra-high-sensitivity ultrasonic probes: “EFR-0SB40K23 opened” Mister rf / CC BY-SA 4.0 (cropped)
- Developing materials for BAW filters in smartphones: “Quartz resonators with front and back electrodes” Beaker / CC BY 3.0 (cropped)
- Related lab (Okubo Lab): “Lithium-Ion Cell cylindric” RudolfSimon / CC BY-SA 3.0 (cropped)
- Related lab (Hamada Lab): “Ion Proton Sequencers, BGI Shenzhen” Scotted400 / CC BY 3.0 (cropped)
- Related lab (Mizuuchi Lab): “Mammoth Terraces” Frank Schulenburg / CC BY-SA 4.0 (cropped)
- Related lab (Okano Lab): “Plastic-compass” Evan-Amos / Public domain (cropped)
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