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| 1 | Tailored optical propulsion forces for controlled transport of resonant gold nanoparticles and associated thermal convective fluid flows显示文摘Noble metal nanoparticles illuminated at their plasmonic resonance wavelength turn into heat nanosources.This phenomenon has prompted the development of numerous applications in science and technology.Simultaneous optical manipulation of such resonant nanoparticles could certainly extend the functionality and potential applications of optothermal tools.In this article,we experimentally demonstrate optical transport of single and multiple resonant nanoparticles(colloidal gold spheres of radius 200 nm)directed by tailored transverse phase-gradient forces propelling them around a 2D optical trap.We show how the phase-gradient force can be designed to efficiently change the speed of the nanoparticles.We have found that multiple hot nanoparticles assemble in the form of a quasi-stable group whose motion around the laser trap is also controlled by such optical propulsion forces.This assembly experiences a significant increase in the local temperature,which creates an optothermal convective fluid flow dragging tracer particles into the assembly.Thus,the created assembly is a moving heat source controlled by the propulsion force,enabling indirect control of fluid flows as a micro-optofluidic tool.The existence of these flows,probably caused by the temperature-induced Marangoni effect at the liquid water/superheated water interface,is confirmed by tracking free tracer particles migrating towards the assembly.We propose a straightforward method to control the assembly size,and therefore its temperature,by using a nonuniform optical propelling force that induces the splitting or merging of the group of nanoparticles.We envision further development of microscale optofluidic tools based on these achievements. | Jose A.Rodrigo Mercedes Angulo Tatiana Alieva | 2020 | Light(Science & Applications)2020，9，1： | 3 |
| 2 | 2019年光学热点回眸显示文摘随着激光的诞生,光学已渗透到人类生活的方方面面。盘点了未来可能会对人类生存及生活方式产生巨大影响的微纳光学、超强激光、成像技术、量子通信、太赫兹技术、光学通信、生物光子学、人工智能用于光学检测8个光学技术研究领域,回顾了这些领域在2019年的重大进展。 | 沈卫星 谢兴龙 朱健强 | 2020 | 科技导报2020，38，1： | 0 |
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