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SUMMARY:Light-matter interactions in hollow-core photonic crystal fibre - 
 Dr Tijmen Euser (University of Cambridge)
DTSTART:20160201T153000Z
DTEND:20160201T170000Z
UID:TALK63490@talks.cam.ac.uk
CONTACT:6270
DESCRIPTION:Hollow-core photonic crystal fibre (HC-PCF) uniquely allows lo
 w-loss propagation of light in a microscale channel\, where it can strongl
 y interact with infiltrated liquids\, gases\, and particles. For instance:
  HC-PCF waveguide modes provide well-defined optical forces that can be us
 ed to launch and propel microparticles and biological cells over long dist
 ances [1\,2]. Particle dynamics can be monitored by in-fibre Doppler veloc
 imetry\, offering a unique way to study viscous forces in microfluidic cha
 nnels. Experiments in air-filled HC-PCF uncovered a novel optothermal trap
 ping mechanism [3]\, with potential applications in lab-on-a-chip devices.
  Furthermore\, exciting a coherent superposition of higher-order waveguide
  modes can create a mode-based "optical conveyor" that combines long-range
  transport with a positional accuracy of about 1 μm [4].  \n\n‘Flying p
 articles’ in HC-PCF can also be used as reconfigurable microscale sensor
 s [5]. For example\, a measurement of the transverse displacement of a cha
 rged microparticle can be used to map the electric field pattern near the 
 surface of a multi-element electrode with a spatial resolution of ~100 μm
 . \n\nReferences\n1.	T. G. Euser et al.\, Opt. Lett. 34\, pp. 3674-3676 (2
 009).\n2.	O. A. Schmidt et al.\, Opt. Lett. 37\, pp. 91-93 (2012).\n3.	O. 
 A. Schmidt et al.\, Phys. Rev. Lett. 109\, 024502 (2012). \n4.	O. A. Schmi
 dt et al.\, Opt. Express 21\, pp. 29383-29391 (2013).\n5.	D. Bykov. et al.
 \, Nat. Phot. 9\, pp. 461–465 (2015).\n
LOCATION:Ryle Seminar (Rutherford 930)
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