超构表面赋能光学微操控技术（特邀）

Xu Xiaohao, 徐孝浩; Gao Wenyu, 高文禹; Li Tianyue, 李添悦; Shao Tianhua, 邵天骅; Li Xingyi, 李星仪; Zhou Yuan, 周源; Gao Geze, 高歌泽; Wang Guoxi, 王国玺; Yan Shaohui, 严绍辉; Wang Shuming, 王漱明; Yao Baoli, 姚保利

doi:10.3788/aos231748

光学学报

2024

DOI: 10.3788/aos231748

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超构表面赋能光学微操控技术（特邀）

徐孝浩 Xu Xiaohao,

高文禹 Gao Wenyu,

李添悦 Li Tianyue

et al.

Abstract: Significance Optical micromanipulation utilizes optical force to dynamically control particles, which has the characteristics of noncontact and can be operated in a vacuum environment. Since the invention of optical tweezers in the 1980s, the field has experienced rapid development and has given rise to many emerging research directions, such as holographic optical tweezers, nearfield evanescent wave optical tweezers, fiber optic tweezers, optoelectronic tweezers,

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Cited by 5 publications

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Amphibious Hybrid Laser Tweezers for Fluid and Solid Domains

Zhu,

Shen,

et al. 2024

ACS Nano

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Optical trapping is a potent tool for achieving precise and noninvasive manipulation of small objects in a vacuum and liquids. However, due to the substantial disparity between optical forces and interfacial adhesion, target objects should be suspended in fluid environments, rendering solid contact surfaces a restricted area for conventional optical tweezers. In this work, by relying on a single continuous wave (CW) laser, we demonstrate an optical manipulation system applicable for both fluid and solid domains, namely, amphibious hybrid laser tweezers. The key to our system lies in modulating the intensity of the CW laser with duration shorter than the dynamic thermal equilibrium time within objects, wherein strong thermal gradient forces with ∼6 orders of magnitude higher than the forces in optical tweezers are produced, enabling moving and trapping micro/nano-objects on solid interfaces. Thereby, CW laser-based optical tweezers and pulsed laser-based photothermal shock tweezers are seamlessly fused with the advantages of cost-effectiveness and simplicity. Our concept breaks the stereotype that CW lasers are limited to generating tiny forces and instead achieve ultrawide force generation spanning from femto-newtons (10–15 N) to (10–6 N). Our work expands the horizon of optical manipulation by seamlessly bridging its applications in fluid and solid environments and holds promise for inspiring optical manipulation techniques to perform more challenging tasks, which may unearth application scenarios in diverse fields such as fundamental physical research, nanofabrication, micro/nanorobotics, biomedicine, and cytology.

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Amphibious Hybrid Laser Tweezers for Fluid and Solid Domains

Zhu,

Shen,

et al. 2024

ACS Nano

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Flexible switchable mid-infrared metalens optical tweezer based on VO₂

He,

Zhang,

Xiao

et al. 2024

Opt. Express

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Metasurface has developed rapidly since its advent because of its powerful control over electromagnetic waves, but most traditional metasurface can only passively realize a single fixed function, which limits its application and development in integrated systems. To modulate electromagnetic waves more flexibly and efficiently, here, we first propose what we believe to be a novel scheme to design a switchable metalens by utilizing the phase change materials VO2 and double-layer metasurface modulation. The metalens designed by the proposed scheme can achieve flexible conversion between the transmitted focusing and reflected focusing through changing the phase state of VO2. Then, we investigate the optical force phenomenon of these metalenses, the simulation results indicating that the proposed switchable metalens can achieve stable particle manipulation under both the transmission and reflection modes. This makes it a promising device in flexible optical manipulation, and this reversible tuning will also show significant application potentials in biology, medicine, optical communication and other fields.

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Particle delivery in generalized optical vortex conveyor belts with a uniform orbital flow

Gao,

Zhou,

et al. 2024

Photon. Res.

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Perfect optical vortex (POV) beams offer a phase-gradient route to convey small particles along a tunable circular path or belt. The prevailing generalized POV method can be used to reshape the conveyor belt, but it usually deteriorates the orbital energy flow of field, leading to unstable conveying speed or even creating unwanted optical traps that prevent transportation. Here, we demonstrate optical conveyor belts with customized profiles and a uniform orbital flow over the whole transporting region by integrating isometric uniform sampling and random phases into the generalized POV generation algorithm. Smooth delivery of metallic particles, inaccessible to conventional generalized POV methods, is achieved at an almost even speed. We also demonstrate a dual-belt conveyor for delivering large metal microparticles, which experience repulsive intensity-gradient forces and thus are unable to be manipulated by a single belt. Our results present a unique addition to the toolbox of optical manipulation and would facilitate the development of small-scale drug delivery microsystems.

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超构表面赋能光学微操控技术（特邀）

Cited by 5 publications

References 152 publications

Amphibious Hybrid Laser Tweezers for Fluid and Solid Domains

Amphibious Hybrid Laser Tweezers for Fluid and Solid Domains

Flexible switchable mid-infrared metalens optical tweezer based on VO₂

Particle delivery in generalized optical vortex conveyor belts with a uniform orbital flow

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超构表面赋能光学微操控技术（特邀）

Cited by 5 publications

References 152 publications

Amphibious Hybrid Laser Tweezers for Fluid and Solid Domains

Amphibious Hybrid Laser Tweezers for Fluid and Solid Domains

Flexible switchable mid-infrared metalens optical tweezer based on VO2

Particle delivery in generalized optical vortex conveyor belts with a uniform orbital flow

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Product

Resources

About

Flexible switchable mid-infrared metalens optical tweezer based on VO₂