Optical micromanipulation in hollow-core photonic crystal fibre
Thursday, 27 Aug. 2015, 10:00 - 11:00
Presenter: Tijmen G. Euser; Max Planck Institute for the Science of Light, Erlangen
Host: M. Aspelmeyer
Where: Kurt-Gödel-Hörsaal, Boltzmanngasse 5, ground floor, 1090 Wien
This talk reviews our work on optical trapping and propulsion of microparticles in hollow-core photonic crystal fibre (HC-PCF). HC-PCF uniquely allows low-loss propagation of light in a microscale channel. The resulting well-defined optical forces can be used to launch and propel microparticles and biological cells over long distances [1,2]. The particle dynamics are monitored by an in-fibre Doppler velocimetry technique, offering a unique way to study viscous forces in microfluidic channels. Experiments in air-filled HC-PCF have led to the discovery of a novel optothermal trapping mechanism , which has potential applications in lab-on-a-chip devices. A coherent superposition of co-propagating higher-order waveguide modes can create a mode-based "optical conveyor belt" that combines long-range transport with a positional accuracy of about 1 μm .
References  T. G. Euser et al., Opt. Lett. 34, pp. 3674-3676 (2009).  O. A. Schmidt et al., Opt. Lett. 37, pp. 91-93 (2012).  O. A. Schmidt et al., Phys. Rev. Lett. 109, 024502 (2012).  O. A. Schmidt et al., Opt. Express 21, pp. 29383-29391 (2013).