136 research outputs found
Fotonische kristallen: houdgreep op maat voor lichtbronnen
Fotonische kristallen zijn materialen die bijzondere verschijnselen vertonen\ud
wanneer men er met licht van buitenaf naar kijkt. In feite zijn fotonische\ud
kristallen zelfs ontworpen om nog onalledaagsere verschijnselen te veroorzaken\ud
wanneer de lichtbron binnen in het kristal wordt geplaatst
Dynamically reconfigurable directionality of plasmon-based single photon sources
We propose a plasmon-based reconfigurable antenna to controllably distribute
emission from single quantum emitters in spatially separated channels. Our
calculations show that crossed particle arrays can split the stream of photons
from a single emitter into multiple narrow beams. We predict that beams can be
switched on and off by switching host refractive index. The design method is
based on engineering the dispersion relations of plasmon chains and is
generally applicable to traveling wave antennas. Controllable photon delivery
has potential applications in classical and quantum communication
Plasmonic Antennas Hybridized with Dielectric Waveguides
For the purpose of using plasmonics in an integrated scheme where single
emitters can be probed efficiently, we experimentally and theoretically study
the scattering properties of single nano-rod gold antennas as well as antenna
arrays placed on one-dimensional dielectric silicon nitride waveguides. Using
real space and Fourier microscopy correlated with waveguide transmission
measurements, we quantify the spectral properties, absolute strength and
directivity of scattering. The scattering processes can be well understood in
the framework of the physics of dipolar objects placed on a planar layered
environment with a waveguiding layer. We use the single plasmonic structures on
top of the waveguide as dipolar building blocks for new types of antennas where
the waveguide enhances the coupling between antenna elements. We report on
waveguide hybridized Yagi-Uda antennas which show directionality in
out-coupling of guided modes as well as directionality for in-coupling into the
waveguide of localized excitations positioned at the feed element. These
measurements together with simulations demonstrate that this system is ideal as
a platform for plasmon quantum optics schemes as well as for fluorescence
lab-on-chip applications
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