Abstract

The capability of focus control has been central to optical technologies that require both high temporal and spatial resolutions. However, existing varifocal lens schemes are commonly limited to the response time on the microsecond timescale and share the fundamental trade-off between the response time and the tuning power. Here, we propose an ultrafast holographic focusing method enabled by translating the speed of a fast 1D beam scanner into the speed of the complex wavefront modulation of a relatively slow 2D spatial light modulator. Using a pair of a digital micromirror device and a resonant scanner, we demonstrate an unprecedented refresh rate of focus control of 31 MHz, which is more than 1,000 times faster than the switching rate of a digital micromirror device. We also show that multiple micrometer-sized focal spots can be independently addressed in a range of over 1 MHz within a large volume of 5 mm × 5 mm × 5.5 mm, validating the superior spatiotemporal characteristics of the proposed technique – high temporal and spatial precision, high tuning power, and random accessibility in a three-dimensional space. The demonstrated scheme offers a new route towards three-dimensional light manipulation in the 100 MHz regime.

This study presents a wavefront shaping scheme to control optical focus in a large 3D space at the unprecedented rate of 30 MHz with micron-scale precision and random accessibility via reallocation of degrees of freedom in spatiotemporal domain.

Details

Title
Large-volume focus control at 10 MHz refresh rate via fast line-scanning amplitude-encoded scattering-assisted holography
Author
Shibukawa, Atsushi 1 ; Higuchi, Ryota 1 ; Song, Gookho 2   VIAFID ORCID Logo  ; Mikami, Hideharu 1   VIAFID ORCID Logo  ; Sudo, Yuki 3   VIAFID ORCID Logo  ; Jang, Mooseok 2   VIAFID ORCID Logo 

 Hokkaido University, Research Institute for Electronic Science, Sapporo, Japan (GRID:grid.39158.36) (ISNI:0000 0001 2173 7691) 
 Korea Advanced Institute of Science and Technology, Department of Bio and Brain Engineering, Daejeon, Republic of Korea (GRID:grid.37172.30) (ISNI:0000 0001 2292 0500) 
 Okayama University, Faculty of Medicine, Dentistry and Pharmaceutical Sciences, Okayama, Japan (GRID:grid.261356.5) (ISNI:0000 0001 1302 4472) 
Pages
2926
Publication year
2024
Publication date
2024
Publisher
Nature Publishing Group
e-ISSN
20411723
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
3034564428
Copyright
© The Author(s) 2024. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.