59,067 research outputs found
The Orbital Angular Momentum of Light for Ultra-High Capacity Data Centers
The potential of orbital angular momentum (OAM) of light in data center scenarios is presented. OAMs can be exploited for short reach ultra-high bit rate fiber links and as additional multiplexing domain in transparent ultra-high capacity optical switches. Recent advances on OAM integrated photonic technology are also reported. Finally demonstration of OAM-based fiber links (aggregate throughput 17.9 Tb/s) and two layers OAM-WDM-based optical switches are presented exploiting OAM integrated components and demonstrating the achievable benefits in terms of size, weight and power consumption (SWaP) compared to different technologies
Efficient generation and control of different order orbital angular momentum states for communication links
We present a novel optical device to encode and decode two bits of
information into different Orbital Angular Momentum (OAM) states of a paraxial
optical beam. Our device generates the four angular momentum states of order
and by Spin-To-Orbital angular momentum Conversion (STOC) in a
triangular optical loop arrangement. The switching among the four OAM states is
obtained by changing the polarization state of the circulating beam by two
quarter wave plates and the two-bit information is transferred to the beam OAM
exploiting a single -plate. The polarization of the exit beam is left free
for additional one bit of information. The transmission bandwidth of the device
may be as large as several megahertz if electro-optical switches are used to
change the beam polarization. This may be particularly useful in communication
system based on light OAM.Comment: 5 pages, 5 figures, 1 table. Submitte
Optical spin-to-orbital angular momentum conversion in ultra-thin metasurfaces with arbitrary topological charges
Orbital angular momentum associated with the helical phase-front of optical
beams provides an unbounded \qo{space} for both classical and quantum
communications. Among the different approaches to generate and manipulate
orbital angular momentum states of light, coupling between spin and orbital
angular momentum allows a faster manipulation of orbital angular momentum
states because it depends on manipulating the polarisation state of light,
which is simpler and generally faster than manipulating conventional orbital
angular momentum generators. In this work, we design and fabricate an
ultra-thin spin-to-orbital angular momentum converter, based on plasmonic
nano-antennas and operating in the visible wavelength range that is capable of
converting spin to an arbitrary value of OAM . The nano-antennas are
arranged in an array with a well-defined geometry in the transverse plane of
the beam, possessing a specific integer or half-integer topological charge .
When a circularly polarised light beam traverses this metasurface, the output
beam polarisation switches handedness and the OAM changes in value by per photon. We experimentally demonstrate values ranging
from to with conversion efficiencies of . Our
ultra-thin devices are integratable and thus suitable for applications in
quantum communications, quantum computations and nano-scale sensing.Comment: 4 pages, 3 figures - submitted
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