Optical forces are used to fixate biological cells with optical tweezers where numerous biological parameters and
phenomena can be studied. Optical beams carry a small momentum which generates a weak optical force, but
on a cellular level this force is strong enough to allow for manipulation of biological cells in microfluidic systems
exclusively using light. We demonstrate an optical cell sorter that uses simultaneous manipulation by multiple
laser beams using the Generalized Phase Contrast method (GPC). The basic principle in an optical sorter is that
the radiation force of the optical beam can push the biological cell from one microfluidic sheath flow to another.
By incorporating a spatial light modulator the manipulation can be made parallel with multiple laser beams.
We claim advantages over the serial optical sorters with only a single laser beam that has been demonstrated by
others.
In the current work we intend to use the optical nano-antenna to include various functionalities for the recently
demonstrated waveguided optical waveguide (WOW) by Palima et al. (Optics Express 2012). Specifically, we
intend to study a WOW with an optical nano-antenna which can block the guiding light wavelength while
admitting other wavelengths of light which address certain functionalities, e.g. drug release, in the WOW. In
particular, we study a bow-tie optical nano-antenna to circular dielectric waveguides in aqueous environments.
It is shown with finite element computer simulations that the nanoantenna can be made to operate in a bandstop
mode around its resonant wavelength where there is a very high evanescent strong electrical probing field
close to the antennas, and additionally the fluorescence or Raman excitations will be be unpolluted by stray
light from the WOW due to the band-stop characteristic. We give geometrical parameters necessary for realizing
functioning nanoantennas.
We report to the best of our knowledge for the first time on the fabrication and characterization of CO2-laser written
long-period gratings in a large-mode area photonic crystal fiber possessing a core diameter of 25 μm. The gratings have
low insertion losses (<1 dB) and high attenuation (>10 dB) at the resonant wavelengths, making them particularly
interesting for high power applications.
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