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Kajikawa Lab
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The lab designs materials that make objects invisible and materials that cool using light.
AboutAbout the lab
Making materials that hide objects, absorb light, and cool
The Kajikawa Lab studies materials that control light and electromagnetic waves, along with methods for designing them.
The lab works on cloaking, in which an object is covered with a special material to make it invisible, and on materials that absorb light and radio waves well even when thin.
It also develops radiative cooling materials that cool objects without using electricity, and devices that generate power from the resulting temperature difference.
Neural networks and genetic algorithms are used to design the materials.
Key terms
- Cloaking
- A technology that covers an object with a special material to make it invisible to light
- Surface plasmon
- A phenomenon in which a collection of electrons on a metal surface oscillates like a wave together with light
- Radiative cooling
- A phenomenon in which an object cools by releasing heat into space as electromagnetic waves. This is also why clear winter mornings are so cold.
- Genetic algorithm
- A computational method that imitates biological evolution to gradually search for good solutions
ResearchResearch themes
The lab studies materials that control light and electromagnetic waves, combining theoretical calculation, simulation, and experiments. It designs materials that make objects invisible, absorb light or radio waves, or cool things, using machine learning as well.
*Illustrative imageCloaking: Making Objects Invisible
This research covers covering an object with a special material so that it becomes invisible to light. The covering materials are designed with machine learning and theoretical calculation, and verified through simulations and experiments.
*Illustrative imageMaterials That Absorb Light and Radio Waves
Using the surface plasmons of metal nanostructures, the lab created thin films that absorb light across a wide range of wavelengths. It is also designing thin materials that absorb the millimeter waves used in 5G and 6G.
*Illustrative imageRadiative Cooling Without Electricity
The lab studies polymer materials and metamaterials suited to radiative cooling, which cools objects without electricity by releasing heat into space as electromagnetic waves. It is also developing devices that generate power from the resulting temperature difference.
*Illustrative imageOptical Design with Machine Learning
Inverse design, which determines a structure from the desired optical properties, requires a very large amount of computation. The lab uses neural networks and genetic algorithms to design materials such as cloaking materials.
MembersFaculty
The Kajikawa Lab consists of faculty members and doctoral and master's students, including international students.As of 2024
- ProfessorKotaro KajikawaPublications ↗
- Assistant Professorオグチ マリア ヴァネッサ バロイ
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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: “Metamaterial 'Flat Lens' ( )” National Institute of Standards and Technology / Public domain (cropped)
- Cloaking: Making Objects Invisible: “Quantum metamaterial with 24 artificial atoms” FMNLab / CC BY 4.0 (cropped)
- Materials That Absorb Light and Radio Waves: “Water droplets in a lotus leaf” Aathavan jaffna / CC BY-SA 3.0 (cropped)
- Radiative Cooling Without Electricity: “Barrug ar y Glaswellt - Hoar frost on the grass - geograph.org.uk - 683897” Alan Fryer / CC BY-SA 2.0 (cropped)
- Optical Design with Machine Learning: “Superconducting Metamaterial Waveguide Chip” OJB Quantum / CC BY 4.0 (cropped)
- Related lab (Haruhiko Ito Lab): “Cold atoms experiment 04” Tomasz Kawalec / CC BY-SA 4.0 (cropped)
- Related lab (Nakagawa Lab): “Mechanical delay stage in an optical setup 01” Aksy88 / CC BY-SA 4.0 (cropped)
- Related lab (Shoji Lab): “Optical patchcord” Sunmosk / CC BY 4.0 (cropped)
- Related lab (Koyama Lab): “Laser table” Pawel Nowakowski / CC BY-SA 4.0 (cropped)
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