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Control of light propagation is usually obtained by appropriately designing the optical path, that is, the refractive index of the material. Common examples are standard lenses and dielectric waveguides. Recently, a new way to tailor the wave front emerged, based on the Pancharatnam-Berry phase (PBP). The PBP is a geometric phase related to changes in the polarization state of light along its propagation...
For the first time, we put forward an orbital angular momentum (OAM) divider based on coordinate transformation. The device can convert the OAM light into multiple diffracted light. The OAM of zeroth-order diffracted light is the product of the input OAM and the scaling parameter. We also extend the scheme to realize equal N-dividing of OAM. The ability of dividing OAM shows huge potential for OAM-based...
We present the realization of photonic structures based on the 3D generalization of deterministic aperiodic sequences in a positive photo-resist by direct laser writing. Diffraction patterns are studied showing characteristic intensity distributions.
In this paper, we investigate a terrestrial relay-assisted scheme for a free-space quantum key distribution (QKD) system based on BB84 protocol. We consider the deployment of passive relays which simply redirect (i.e., collect and point) the qubits to the next relay node or to the receiver without performing any measurement or detection process. Based on a near-field analysis, we derive an upper bound...
Phase-only spatial light modulators are used for reconstructions from inline phase holograms that are calculated by Gerchberg-Saxton iterative algorithm. Although iterative procedures are slow in computing holograms, we obtained sufficient results with a rather low number of iterations. We have shown that reconstruction of 2D objects whose sizes are larger than SLM size is possible. Not only single...
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