November 18, 2024
The University of Tokyo
Tokyo University of Science
Keio University
Japan Science and Technology Agency (JST)
Highlights
Demonstrated a method for generating optical beams with a topological structure called skyrmions (optical skyrmion beams) using a silicon photonic integrated circuit platform.
Dramatically reduced the generation system for optical skyrmion beams from the conventional benchtop scale to the micrometer scale.
This achievement provides a compact and stable generation method for optical skyrmion beams. It is expected to lead to the development of next-generation optical communication and measurement technologies that leverage the unique properties of these beams, as well as contribute to the discovery and understanding of new light-matter interactions.
A research group led by Professor Satoshi Iwamoto of the Research Center for Advanced Science and Technology at The University of Tokyo, Assistant Professor Fumihiro Hayashi of the Institute of Innovative Research at Tokyo University of Science (at the time of the research, Project Assistant Professor at the Research Center for Advanced Science and Technology, The University of Tokyo), Associate Professor Yasutomo Ota of Keio University, and Project Professor Yasuhiko Arakawa of the Institute for Nano Quantum Information Electronics at The University of Tokyo has successfully generated special optical beams with skyrmion topology using a compact optical device fabricated with silicon photonics technology.
In this study, the researchers focused on the spin-orbit interaction of light, which becomes prominent as a result of strong light confinement in nanowire waveguides. By utilizing this phenomenon to control the angular momentum of light, they achieved the first-ever generation of optical beams with skyrmion characteristics (optical skyrmion beams) using a micro-optical device. Optical skyrmion beams are expected to enable robust optical communications resistant to disturbances, but conventional generation methods have faced challenges in terms of device size and stability. This achievement demonstrates the potential to overcome these challenges by utilizing micro-optical devices realized with silicon photonics technology, and it is expected to become a key enabling technology that will unlock the diverse possibilities of optical skyrmion beams.
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