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Optical forces and torques at the nanoscale: Fundamentas and bio-applications

Friday, October 6, 2017 - 12:00
Place: 
Donostia International Physics Center
Who: 
Prof. Daniel Jaque, Universidad Autónoma de Madrid.
Source Name: 
DIPC

There is not discussion at all about the relevant role
that optical tweezers have played in the recent development of photonics.
Optical trapping has allowed the achievement of old dreams such as the
contactless manipulation of ADN molecules or the fabrication of frictionless
micro actuators. The potential of optical tweezers has been further boosted by
their recently demonstrated ability for remote, three dimensional and real time
manipulation of sub 100 nm dielectric nanoparticles. This, in turns, has led to
amazing achievements such as three dimensional thermal measurements in a
cellular environment. What is surprising is that all these exciting results
have been achieved without a complete understanding on the physical origin of
the optical forces and torques appearing on dielectric micro and nanoparticles.
For instance, it has been traditionally assumed that such optical forces are
given by the electronic polarizability of the nanoparticle which mainly depends
on its size. Nevertheless, this widely assumed behaviour has been ruled out to
be false. In this work we discuss on the recent developments in the
understanding of the nature of optical forces and torques acting on micro/nano
dielectric particles. In addition, the possible bio-application of optically
trapped dielectric nanoparticles will be discussed. As an example, their
ability for the measurement of intracelullar temperature and viscosity will be
demonstrated. 

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