Dramatical extention of addressable 3D space of optical focusing by complex wavefront shaping

2023 Fiscal Year Final Research Report

• Project/Area Number: 21H01393
• Research Category: Grant-in-Aid for Scientific Research (B)
• Allocation Type: Single-year Grants
• Section: 一般
• Review Section: Basic Section 21060:Electron device and electronic equipment-related
• Research Institution: Hokkaido University
• Principal Investigator: Shibukawa Atsushi 北海道大学, 電子科学研究所, 准教授 (80823244)
• Project Period (FY): 2021-04-01 – 2024-03-31
• Keywords: ホログラフィ / バイオイメージング / 光散乱

Outline of Final Research Achievements

The objective of this research is to dramatically improve the conventional limits of “depth range” and “lateral range (field of view)” in which optical focusing can be made in biological tissues. In the former, we have successfully developed an ultrafast spatial light modulator as a fundamental device and constructed a high-speed wavefront shaping system using the developed spatial modulator. However, we did not reach the stage of applying the developed technology to the mouse brain. In the latter, as originally planned, we succeeded in developing an ultrafast scattering lens and realized a biological imaging technology that combines a 5 mm field of view with a 0.5 μm spatial resolution.

Free Research Field

光学

Academic Significance and Societal Importance of the Research Achievements

要素技術として開発した超高速空間光変調器は、従来の液晶変調器やデジタルミラーデバイスと比べて、約1000倍高速な平均リフレッシュレート10MHzを実現しているため、光学研究における基盤デバイスの大幅な性能向上を果たしたと言える。また，現状において世界最速の空間変調器であるGrating light valveの変調速度（350kHz）と比較して，開発変調器は約30倍の変調速度を誇る．開発空間光変調器は、本研究の目的を達成するための要素技術としてだけはなく、大面積のパノラマプロジェクタ，超高速光リソグラフィなどへの応用が期待できます。