Optical manipulation and assembly of micro/nanoscale objects on solid substrates

Li, Jingang; Alfares, Ali; Zheng, Yuebing

doi:10.1016/j.isci.2022.104035

Cited by 19 publications

(19 citation statements)

References 92 publications

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“…The light-to-energy conversion efficiency of OTNM was estimated to be ∼10 –14 at a laser power of 5–10 mW (see Note S7), which is comparable with the state-of-the-art microscopic optical engines . In comparison to other micro/nanomotors on solid substrates based on liquid-crystal films, − OTNM has no specific requirements for the solid substrate, making it compatible with current complementary metal-oxide-semiconductor technologies. Operating on solid substrates, OTNM can be integrated with solid-state nanoelectronics for the development of on-chip active nanodevices and applications in photonics, optoelectronics, and optomechanics.…”

Section: Discussionmentioning

confidence: 83%

Opto-Thermocapillary Nanomotors on Solid Substrates

Kollipara

Liu

et al. 2022

ACS Nano

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Motors that can convert different forms of energy into mechanical work are of profound importance to the development of human societies. The evolution of micromotors has stimulated many advances in drug delivery and microrobotics for futuristic applications in biomedical engineering and nanotechnology. However, further miniaturization of motors toward the nanoscale is still challenging because of the strong Brownian motion of nanomotors in liquid environments. Here, we develop light-driven optothermocapillary nanomotors (OTNM) operated on solid substrates where the interference of Brownian motion is effectively suppressed. Specifically, by optically controlling particle−substrate interactions and thermocapillary actuation, we demonstrate the robust orbital rotation of 80 nm gold nanoparticles around a laser beam on a solid substrate. With on-chip operation capability in an ambient environment, our OTNM can serve as light-driven engines to power functional devices at the nanoscale.

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Section: Discussionmentioning

confidence: 83%

Opto-Thermocapillary Nanomotors on Solid Substrates

Kollipara

Liu

et al. 2022

ACS Nano

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“…71 Besides the manipulation in liquid, the surface of liquids (i.e., the liquid/air interface in Figure 1i) and the surface of solid substrates (i.e., the solid/air interface and the solid/liquid interface in Figure 1j) also provide useful paradigms for optical manipulation mediated by auxiliary forces. 72,73 The target particles themselves can also play important roles in optical manipulation by introducing resonant optical forces (Figure 1k). Very small particle size (such as nanomaterials) or similar refractive index between the target particle and the background (such as some bioparticles) prevents generating an optical force large enough to overcome the instability caused by thermal fluctuations.…”

Section: Fundamentals Of Optical Forces and Auxiliary Forces In Vario...mentioning

confidence: 99%

“…For example, the transported particles can be immobilized after patterning and have potential applications such as nanofabrications. 73,120 These interfaces, with the perpendicular-direction confinement and interface effect, promise applications in chiral particle sorting, advanced fabrication and research of physical chemistry.…”

Section: Outlook and Conclusionmentioning

confidence: 99%

“…Typical paradigms to utilize these force fields are shown in Figure h, including the liquid environment and heating components such as metal substrate or particles . Besides the manipulation in liquid, the surface of liquids (i.e., the liquid/air interface in Figure i) and the surface of solid substrates (i.e., the solid/air interface and the solid/liquid interface in Figure j) also provide useful paradigms for optical manipulation mediated by auxiliary forces. , …”

Section: Fundamentals Of Optical Forces and Auxiliary Forces In Vario...mentioning

confidence: 99%

“…In high concentration solution of molecules, the irradiated laser beams on the interface can induce crystallization, with areas much larger than the focal spot. − Chiral particle sorting has also been proposed on the interface. , Similar but different from the liquid surface, the surface of solid substrate (i.e., the solid/air interface and the solid/liquid interface) also has advantages in some situations, especially with its solid constraints in the z -direction (perpendicular to the interface) and strong adhesion force from the substrate. For example, the transported particles can be immobilized after patterning and have potential applications such as nanofabrications. , These interfaces, with the perpendicular-direction confinement and interface effect, promise applications in chiral particle sorting, advanced fabrication and research of physical chemistry.…”

Section: Outlook and Conclusionmentioning

confidence: 99%

See 2 more Smart Citations

Recent Progress on Optical Micro/Nanomanipulations: Structured Forces, Structured Particles, and Synergetic Applications

et al. 2022

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Optical manipulation has achieved great success in the fields of biology, micro/nano robotics and physical sciences in the past few decades. To date, the optical manipulation is still witnessing substantial progress powered by the growing accessibility of the complex light field, advanced nanofabrication and developed understandings of light–matter interactions. In this perspective, we highlight recent advancements of optical micro/nanomanipulations in cutting-edge applications, which can be fostered by structured optical forces enabled with diverse auxiliary multiphysical field/forces and structured particles. We conclude with our vision of ongoing and futuristic directions, including heat-avoided and heat-utilized manipulation, nonlinearity-mediated trapping and manipulation, metasurface/two-dimensional material based optical manipulation, as well as interface-based optical manipulation.

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Ultrasound Microrobots with Reinforcement Learning

Schrage

Medany

Ahmed

2023

Adv Materials Technologies

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Ultrasound is an attractive modality for controlling micro/nanorobots due to penetrating deep into tissue, not being affected by the opaque nature of animal bodies, and generating a broad range of forces. However, ultrasound microrobots have poor navigation capabilities and the number of parameters involved in its motion make it extremely challenging for a human controller to accurately predict and manually correct the microrobot's position in real time. Herein, reinforcement learning control strategy is implemented to learn microrobot dynamics by accurately identifying micro/nanorobots (object detection and tracking) and manipulating them with ultrasound. This work demonstrates autonomous navigation of ultrasound microrobots in a fluidic environment. The propulsion strategy relies on the combined action of the primary and secondary radiation forces. Microswarms are formed through the secondary acoustic radiation force, while the primary acoustic radiation force guides the microrobots along a desired trajectory. Microrobots are trained using more than 100 000 images to study their unexpected dynamics. The control of the microrobots is validated, illustrating a good level of robustness and providing the microrobots with computational intelligence that enables them to navigate independently in an unstructured environment without outside assistance.

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Optical manipulation and assembly of micro/nanoscale objects on solid substrates

Cited by 19 publications

References 92 publications

Opto-Thermocapillary Nanomotors on Solid Substrates

Opto-Thermocapillary Nanomotors on Solid Substrates

Recent Progress on Optical Micro/Nanomanipulations: Structured Forces, Structured Particles, and Synergetic Applications

Ultrasound Microrobots with Reinforcement Learning

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