;;; µm ;;; µm
;;; µm ;;; µm ;;; µm ;;; µm
of the Airy beam maximum at the
front face of a photorefractive crystal
to the shifted output position at the
back. 4 Since our setup is based on
a computer-controlled spatial light
modulator, we can easily rotate the
writing beam or change its phase
spectrum in order to modify the
direction or magnitude of this
shift. Moreover, when applying the
concept of incremental multiplexing
of optically induced structures, we
can superimpose and activate several
channels at the same time, thus creating a structure that simultaneously
routes light to multiple outputs. 5
The flexibility of this new all-optical waveguide concept facilitates
complex routing schemes and could
be pathbreaking for novel waveguiding applications.
Optical information processing requires controlling light in all
its parameters as well as considering
nonlinear responses and adaptivity.
Therefore, optical storage, optical inter-connects and optical routers in nonlinear
reconfigurable systems have been the
subject of intensive research in recent
years. Since waveguiding is typically
associated with fixed refractive index
structures, adaptivity is one of the most
challenging issues in optical routing.
Previously, reversible discrete
refractive index structures created
in nonlinear optical materials were
important for controling light and
light propagation. 1 This year, we
presented a new adaptive all-optical
routing technique that combines the
versatility of this approach with the
unique propagation properties of
Airy beams are self-accelerating
beams that propagate on a curved
trajectory. 2 Their transverse shape is
asymmetric showing a characteristic
pattern with one pronounced bright
lobe. Their most striking feature is
that they do not diffract, thereby
compensating for disturbances via
self-healing. Airy beams have been
used for many applications ranging
from optical micromanipulation to
electron acceleration. 3 Until now,
they have not been combined with
waveguiding concepts in order to
realize accelerated self-healing adaptive waveguides.
Our approach allows for the
creation of reversible curved paths
of increased refractive index that
guide light from the input position
(a) Cubic phase spectrum used for the holographic generation of the 2-D Airy beam
shown in (b). This beam propagates through the photorefractive material, and at the
output we find a shifted pattern (c). (d) Schematic array of 16 spatially separated output
channels. (e) Gaussian input beam. (f) Without an optically induced structure, the Gaussian beam diffracts. (g) With an Airy beam induced refractive index channel, the beam is
precisely guided. (h) Demonstration of this unique feature for a two-channel splitter.
Patrick Rose ( patrick.rose
and Cornelia Denz
Institute for Applied Physics
and Center for Nonlinear
Science (CeNoS), University
of Münster, Germany
1. J. W. Fleischer et al. Nature
422, 147 (2003).
2. G. A. Siviloglou et al. Opt. Lett.
32, 979 (2007).
3. Y. Hu et al. Self-accelerating
Airy Beams: Generation, Control,
and Applications. Z. Chen and
R. Morandotti (eds.), Springer
4. P. Rose et al. Appl. Phys. Lett.
102, 101101 (2013).
5. M. Boguslawski et al. Opt.
Express 20, 27331 (2012).
Airy Beam Induced