Precise balancing of viscous and radiation forces on a particle in liquid-filled photonic bandgap fiber

Euser, T. G.; Garbos, M. K.; Chen, J. S. Y.; Russell, P. St. J.

doi:10.1364/ol.34.003674

Cited by 45 publications

(26 citation statements)

References 19 publications

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“…By varying the relative power of two counterpropagating guided modes, the particles can be held stationary or propelled in either direction along several meters of fiber. We observe particle velocities 2 orders of magnitude higher than in liquid-filled HC-PCF [11] and show that the refractive index and density of a particle can be unambiguously determined from Doppler measurements of particle speed.A schematic of the setup is shown in Fig. 1(a).…”

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confidence: 74%

Metrology of laser-guided particles in air-filled hollow-core photonic crystal fiber

2011

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Micrometer-sized particles are trapped in front of an air-filled hollow-core photonic crystal fiber using a novel dual-beam trap. A backward guided mode produces a divergent beam that diffracts out of the core, and simultaneously a focused laser beam launches a forward-propagating mode into the core. By changing the backward/forward power balance, a trapped particle can be selectively launched into the hollow core. Once inside, particles can be optically propelled along several meters of fiber with mobilities as high as 19 cm·s(-1) W(-1) (precisely measured using in-fiber Doppler velocimetry). The results are in excellent agreement with theory. The system allows determination of fiber loss as well as the mass density and refractive index of single particles.

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confidence: 74%

Metrology of laser-guided particles in air-filled hollow-core photonic crystal fiber

2011

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“…The range over which microparticles can be positioned can be extended by optically propelling them inside capillary fibres, but high transmission loss limits the propulsion length to a few centimetres at most 18 . Hollow-core photonic crystal fibre (HC-PCF) offers much lower optical loss, allowing microparticles to be positioned with micrometre precision over long distances, limited only by the fibre loss [19][20][21][22][23] . PCF has also been used in a range of other sensing applications 24,25 .…”

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confidence: 99%

Flying particle sensors in hollow-core photonic crystal fibre

et al. 2015

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Optical fibre sensors make use of diverse physical effects to measure parameters such as strain, temperature and electric field. Here we introduce a new class of reconfigurable fibre sensor, based on a 'flying-particle' optically trapped inside a hollow-core photonic crystal fibre and illustrate its use in electric field and temperature sensing with high spatial resolution. The electric field distribution near the surface of a multi-element electrode is measured with a resolution of similar to 100 mu m by monitoring changes in the transmitted light signal due to the transverse displacement of a charged silica microparticle trapped within the hollow core. Doppler-based velocity measurements are used to map the gas viscosity, and thus the temperature, along a hollow-core photonic crystal fibre. The flying-particle approach represents a new paradigm in fibre sensors, potentially allowing multiple physical quantities to be mapped with high positional accuracy over kilometre-scale distances

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“…We recently measured small external forces on particles guided in both liquidfilled [19,20] and air-filled HC-PCFs [21] by balancing them against the radiation pressure provided by the waveguide mode. In this Letter we demonstrate that, within the confines of an air-filled HC-PCF, the viscous drag force on particles, caused by micron-scale TCF at the core walls, can exceed the thermophoretic force by several orders of magnitude.…”

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confidence: 99%