23 research outputs found
Inherent polarization entanglement generated from a monolithic semiconductor chip
Creating miniature chip scale implementations of optical quantum information
protocols is a dream for many in the quantum optics community. This is largely
because of the promise of stability and scalability. Here we present a
monolithically integratable chip architecture upon which is built a photonic
device primitive called a Bragg reflection waveguide (BRW). Implemented in
gallium arsenide, we show that, via the process of spontaneous parametric down
conversion, the BRW is capable of directly producing polarization entangled
photons without additional path difference compensation, spectral filtering or
post-selection. After splitting the twin-photons immediately after they emerge
from the chip, we perform a variety of correlation tests on the photon pairs
and show non-classical behaviour in their polarization. Combined with the BRW's
versatile architecture our results signify the BRW design as a serious
contender on which to build large scale implementations of optical quantum
processing devices
Coupling the normal incident light into waveguide modes of DBR mirrors via a diffraction grating
Non local effects in cone-shaped metamaterials
Light-matter interactions in a material may be dramatically influenced by the features of the medium. Moreover, the electromagnetic characteristics of the material in the nearby areas may make a dramatic impact as well. Following the first scenario, the medium is considered to be local, whereas in the other case, it is nonlocal. It has been demonstrated by the current works on light-matter interactions in composites that novel optical phenomena is enabled by nonlocal effects. The former can not be treated in case of local effective medium description
Tunable Dipole Surface Plasmon Resonances of Silver Nanoparticles by Cladding Dielectric Layers
Chiral light intrinsically couples to extrinsic/pseudo-chiral metasurfaces made of tilted gold nanowires
A multiband perfect absorber based on hyperbolic metamaterials
In recent years, considerable research efforts have been focused on near-perfect and perfect light absorption using metamaterials spanning frequency ranges from microwaves to visible frequencies. This relatively young field is currently facing many challenges that hampers its possible practical applications. In this paper, we present grating coupled-hyperbolic metamaterials (GC-HMM) as multiband perfect absorber that can offer extremely high flexibility in engineering the properties of electromagnetic absorption. The fabricated GC-HMMs exhibit several highly desirable features for technological applications such as polarization independence, wide angle range, broad- and narrow- band modes, multiband perfect and near perfect absorption in the visible to near-IR and mid-IR spectral range. In addition, we report a direct application of the presented system as an absorption based plasmonic sensor with a record figure of merit for this class of sensors