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Yokota Lab
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The lab uses light to observe new properties that appear at the boundaries of materials, and puts them to use.
AboutAbout the lab
Finding new functions at the “boundaries” of materials.
The Yokota Lab investigates new properties that appear at “boundaries” within materials, with the aim of creating advanced information materials.
In the IoT society, there is demand for memory that can store ever-growing amounts of information and for capacitors that operate stably even at high temperatures and high frequencies.
Built on two pillars, “making things” and “seeing things,” the lab fabricates thin films and conducts observation with ultrashort-pulse lasers.
Using “high electric fields” and “antiferroelectrics” as clues, the lab works on synthesizing new materials and evaluating their dielectric and dielectric breakdown properties.
Key terms
- Ferroelectric
- A material that has an electric polarization even without applied voltage, and whose direction can be switched by an electric field
- Domain
- A region where the direction of electric polarization is aligned. The boundary between such regions is called a domain boundary
- Optical second harmonic generation
- Light with half the wavelength that is emitted when intense light strikes a material
NewsLab news
Assistant Professor Kuwano won the Outstanding Paper Award of the Ceramic Society of Japan
A paper by a master's student won the Outstanding Paper Award of the Journal of the Ceramic Society of Japan
A master's student won the Outstanding Master's Thesis Presentation Award
A paper by Professor Yokota was published in Chemical Communications, among others
A paper by Assistant Professor Kuwano was published in the journal Ceramics International
ResearchResearch themes
In the IoT society, there is demand for memory that can store ever-growing amounts of information, and for compact capacitors that operate stably at high temperatures, high frequencies, and high power. The Yokota Lab focuses on “boundaries” in materials and aims to create advanced information materials by exploiting the new physical properties that appear there.
*Illustrative imageHow Giant Properties Arise
In some materials, the value of a physical property becomes exceptionally large. Using synchrotron radiation and neutrons, the lab takes on the challenge of clarifying why the value increases.
*Illustrative imageControlling Properties at Boundaries
The lab takes on the challenge of observing in three dimensions the physical phenomena that appear at domain boundaries, and of controlling those phenomena by applying force from outside. At boundaries, physics entirely different from that of the material as a whole unfolds.
*Illustrative imageSeeing Boundaries with Circularly Polarized Light
The lab has established a method that uses circularly polarized optical second harmonic generation to visualize the structure of ferroaxial domains, which has been difficult to see with conventional microscopes.
*Illustrative imageA 3D Microscopy System
The lab is developing a new microscopy system that can observe moving samples in three dimensions without damaging them. Using ultrashort-pulse lasers, it measures the unusual properties and structures of boundaries non-destructively.
MembersFaculty
The Yokota Lab's members consist of faculty, assistants, research collaborators, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorHiroko YokotaPublications ↗
- Assistant ProfessorTaro KuwanoPublications ↗
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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: “Microscopic image of crystals growing from melted sulfur” AlexmarPhoto / CC BY 4.0 (cropped)
- How Giant Properties Arise: “SM beamline ( )” CLS Research Office from Saskatoon, Canada / CC BY-SA 2.0 (cropped)
- Controlling Properties at Boundaries: “Ferroelectric domains at a PZT grain boundary ( )” Oak Ridge National Laboratory / CC BY 2.0 (cropped)
- Seeing Boundaries with Circularly Polarized Light: “Crystals under the polarized light microscope” Korinna / CC BY 4.0 (cropped)
- A 3D Microscopy System: “Bose-Einstein condensate, a cloud of super-cooled Rubidium atoms in a Laser trap on an Optical table - In a game of catch & release, the atoms will shoot up a 30 ft. tall Atomic fountain - Stanford” Steve Jurvetson from Menlo Park, USA / CC BY 2.0 (cropped)
- Related lab (Funakubo Lab): “LiNbO3” Solid State / Public domain (cropped)
- Related lab (Hoshina Lab): “Ceramic capacitors mounted on a PCB” Giovanna 27 / CC BY 4.0 (cropped)
- Related lab (Hiramatsu Lab): “InGaN crystal SEM+CL” FDominec / CC BY 4.0 (cropped)
- Related lab (Azuma Lab): “Aust.-Synchrotron-Interior-Panorama” jjron / CC BY-SA 3.0 (cropped)
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