报告题目：Optical-trapping and optofluidics with plasmonic resonance induced effects in random metallic nano-islands
报告人：Aaron Ho-Pui Ho (何浩培), Prof.
报告人单位：The Chinese University of Hong Kong, Hong Kong
时间：2018年05月21日15:00-
地点：仙林校区教2-314室
主办单位：350VIP浦京集团
报告内容：We experimentally demonstrate several useful applications of random gold plasmonic nano-islands in optofluidics, including (i) optical trapping and assembling of particles and live cells into highly organized pattern with low power density [1,2] and (ii) optically actuated microfluidic flow guiding and valves [3]. The observed trapping effect is attributed to optical forces from localized surface plasmons combined with thermal convection that pushes the target objects into the trapping zone. It was found that thermophoresis plays a critical role in the system. More recently we reported trapping in pure resistive-heating, i.e. photon-free, devices [4]. Our work provides a simple platform for on-chip optical manipulation of nanoand micro-sized objects, and may find applications in physical and life sciences.
报告人简介：Aaron Ho-Pui Ho (何浩培) received his BEng and PhD in Electrical and Electronic Engineering from the University of Nottingham in 1986 and 1990 respectively. Currently a professor in the Department of Biomedical Engineering, The Chinese University of Hong Kong. Started as a compound semiconductor materials scientist, his current academic interests focus on nano-sized semiconductor materials for photonic and sensor applications, optical instrumentation, surface plasmon resonance biosensors, lab-on-a-chip and biophotonics. He has published over 300 peer-reviewed articles, 16 Chinese and 6 US patents. He is a Fellow of SPIE.
References
[1]. Z. Kang, J. Chen, S.Y. Wu, K. Chen, S.K. Kong, K.T. Yong and H.P. Ho,Trapping and assembling of particles and live cells on large-scale random goldnano-island substrates, Scientific Reports, DOI:10.1038/srep09978 (2015).
[2]. Jiajie Chen, Zhiwen Kang, Siu Kai Kong, and Ho-pui Ho, Plasmonic randomnanostructures on fiber tip for trapping live cells and colloidal particles. OpticsLetters, 40(2015), 3926-3929.
[3]. J. Chen, Z. Kang, G. Wang, J. F. C. Loo, S. K. Kong, and H. P. Ho, Optofluidicguiding, valving, switching and mixing based on plasmonic heating in a randomgold nanoisland substrate, Lab-on-a-Chip, 15(2015), 2504-2512.
[4]. J.J. Chen, H.J. Cong, F.C. Loo, Z.W. Kang, M.H. Tang, H.X. Zhang, S.Y. Wu,S.K. Kong, H.P. Ho, Thermal gradient induced tweezers for the manipulation ofparticles and cells, Scientific Report, 6 (2016), Article No. 35814. (DOI:10.1038/srep35814).