基于微流控芯片上氮化硅波导结和锥形波导结的微粒子光阱。

Optical trapping of microparticles using silicon nitride waveguide junctions and tapered-waveguide junctions on an optofluidic chip.

机构信息

Photonic Device Laboratory, Department of Electronic and Computer Engineering, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China.

出版信息

Lab Chip. 2012 Oct 7;12(19):3803-9. doi: 10.1039/c2lc40636e.

DOI:10.1039/c2lc40636e

PMID:22878866

Abstract

We study optical trapping of microparticles on an optofluidic chip using silicon nitride waveguide junctions and tapered-waveguide junctions. We demonstrate the trapping of single 1 μm-sized polystyrene particles using the evanescent field of waveguide junctions connecting a submicrometer-sized input-waveguide and a micrometer-sized output-waveguide. Particle trapping is localized in the vicinity of the junction. We also demonstrate trapping of one and two 1μm-sized polystyrene particles using tapered-waveguide junctions connecting a submicrometer-sized singlemode input-waveguide and a micrometer-sized multimode output-waveguide. Particle trapping occurs near the taper output end, the taper center and the taper input end, depending on the taper aspect ratio.

摘要

我们使用氮化硅波导结和锥形波导结研究了在微流控芯片上的微粒子光阱。我们演示了通过连接亚微米输入波导和微米输出波导的波导结的消逝场来捕获单个 1 微米大小的聚苯乙烯粒子。粒子捕获被局限在结附近。我们还演示了使用连接亚微米单模输入波导和微米多模输出波导的锥形波导结来捕获一个和两个 1 微米大小的聚苯乙烯粒子。根据锥形比，粒子捕获发生在锥形输出端、锥形中心和锥形输入端附近。