光电工程, 2017, 44 (12): 1180, 网络出版: 2018-01-17   

飞秒贝塞尔光用于可磁驱动微管道的高效加工

Microtube fabrication based on femtosecond Bessel beam and its flexible driving with external magnetic field
作者单位
中国科学技术大学精密机械与精密仪器系,合肥 230026
摘要
微管道是微纳领域最基本的模型之一,其结构简单、均匀,应用广泛。本文提出一种利用飞秒贝塞尔光进行激光直写,结合磁控溅射金属镀层,加工可磁驱动微管道的新方法。利用空间光调制器将飞秒激光调制成飞秒贝塞尔光,通过高数值孔径的物镜聚焦,配合精密三维压电平台的移动,实现了微管道的拉伸加工;通过后续磁控溅射镍处理后,微管道具有超顺磁特性,利用外部磁场可以有效实现驱动。本文详细研究了利用空间光调制器产生的飞秒贝塞尔光的传播和聚焦特性,提出的微管道加工新方法可实现微管道直径、长度、排布的灵活控制,加工效率高;经磁控溅射镍处理的微管道可以利用外部磁场实现在液体环境下沿特定路径的可控驱动,运动灵敏度高,环境适应性强。这种新的微管道加工方法具有灵活、可控、高效的优点,所加工的可驱动微管道在无创手术、靶向药物运输、生物成像与传感、微环境净化等领域具有广阔的应用前景。
Abstract
Microtube, with simple and uniform geometry, is one of the basic structures in micro/nano field. We present a method for the fabrication of magnetic drivable microtubes, by direct femtosecond laser writing com-bined with magnetron sputtering with metal layer. Femtosecond laser beam is modulated into Bessel beam with spatial light modulator (SLM), and then Bessel beam is focused with a high numerical aperture objective. Micro-tubes are fabricated by scanning focused femtosecond Bessel beam in a sample anchored on a three dimen-sion stage. Followed by magnetron sputtering a nickel layer, the microtubes exhibit supermagnetic property and can be flexibly driven by external magnetic field. In this study, the propagation and high numerical aperture fo-cusing properties of femtosecond Bessel beams are investigated. Microtubes, with well controlled diameter, length and distribution are efficiently fabricated. Rapid steering of nickel coated microtubes along specific route in fluid environment with external magnetic field has been realized. The steering of microtubes can be realized in various fluid environments. This method is flexible, controllable and efficient and the fabricated drivable mi-crotubes have a promising applications in noninvasive surgery, targeted drug delivery, bioimaging or biosensing and microenvironment cleaning.

辛晨, 杨亮, 胡治江, 胡凯, 钱冬冬, 胡衍雷, 李家文, 吴东. 飞秒贝塞尔光用于可磁驱动微管道的高效加工[J]. 光电工程, 2017, 44(12): 1180. Chen Xin, Liang Yang, Zhijiang Hu, Kai Hu, Dongdong Qian, Yanlei Hu, Jiawen Li, Dong Wu. Microtube fabrication based on femtosecond Bessel beam and its flexible driving with external magnetic field[J]. Opto-Electronic Engineering, 2017, 44(12): 1180.

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