Atomic-scale confinement of optical fields

In the presence of matter there is no fundamental limit preventing confinement of visible light even down to atomic scales. Achieving such confinement and the corresponding intensity enhancement inevitably requires simultaneous control over atomic-scale details of material structures and over the optical modes that such structures support. By means of self-assembly we have obtained side-by-side aligned gold nanorod dimers with robust atomically-defined gaps reaching below 0.5 nm. The existence of atomically-confined light fields in these gaps is demonstrated by observing extreme Coulomb splitting of corresponding symmetric and anti-symmetric dimer eigenmodes of more than 800 meV in white-light scattering experiments. Our results open new perspectives for atomically-resolved spectroscopic imaging, deeply nonlinear optics, ultra-sensing, cavity optomechanics as well as for the realization of novel quantum-optical devices

Coordinating cooperative perception in urban air mobility for enhanced environmental awareness

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Concept for a decentralized tactical conflict management in a U-space ecosystem

To ensure the success of future urban air mobility, it is important to address public concerns regarding safety, and noise. Current regulations stipulate that UAS traffic in Europe occurs in U-space airspaces, where the UAS operator is responsible for flight safety. However, before these legal principles can be technically implemented, the underlying processes must first be defined. Therefore, this paper proposes a decentralized tactical conflict management concept in a U-space ecosystem. The concept is developed based on legal and technical requirements for process automation, sensor technology, and communication. It consists of three modules: conflict detection, application of resolution strategies, and initiating a failure strategy. The focus is on the presentation of key stakeholders and their responsibilities as well as the interactions between them. A final practical example shows the basic applicability of the concept.Freie und Hansestadt Hamburg (FHH

Concept for a decentralized tactical conflict management in a U-space ecosystem

Behörde für Wissenschaft, Forschung, Gleichstellung und Bezirke​PeerReviewe