vor 5 Jahren

Cluster Report Photonics in the Capital Region Berlin-Brandenburg

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36 Cluster Report Optics and PhotonicsPhotonics for Communications and Sensors have been equipped with the LCTs and ensure communication between the satellites in the ESA’s Copernicus project. Semiconductor manufacturing requires experience and precision. © First Sensor AG Closed lightweight structures for mirrors in space © Berliner Glas Group One example is the ESA earth observation satellite “Sentinel-1A”. Equipped with a laser communication terminal containing laser diode benches from Berlin’s Ferdinand-Braun-Institut, Leibniz-Institut fuer Hoechstfrequenztechnik (FBH) and several optical components and systems from the Berliner Glas Group, the satellite can transmit data over long distances using lasers, a first in the communication of earth observation satellites. The German communications satellite “Heinrich Hertz” is scheduled to go into orbit in 2021. More than 40 German companies and organisations are involved in this showcase project. The satellite is expected to operate for 15 years at about 36,000 km (22,370 miles) above the earth’s surface. Given the rough conditions in space, quality work is a must. A special antenna for communication with the earth is being built by the Berlin company First Sensor AG in cooperation with the Aachen University of Applied Sciences (RWTH) and IMST GmbH in Kamp-Lintfort. First Sensor is one of the world’s leading suppliers in the field of sensor technology, especially for industrial, medical, and mobility applications. The company’s avalanche photodiodes, for example, are used as optical sensors in autonomous industrial drones. The company has more than 850 employees at its six German locations and worldwide. The laser diodes from eagleyard Photonics GmbH have also found their way into space. The Adlershof-based subsidiary of TOPTICA Photonics AG develops and manufactures laser diodes for a wide range of applications including analytics, automotive technology, and industrial applications as well as aerospace. Quantum Technology: from Theory to Application Quantum technologies also open new horizons in the field of communications technology, especially for the encryption of information by entangled photons. A Chinese-Austrian collaboration has already been able to exchange quantum keys between the two countries using an experimental satellite. Berlin is also active in the research of these technologies. Highly stable semiconductor diodes play an important role for future quantum systems. The FBH is also very active in the field of modern quantum components. Together with Humboldt University Berlin, they are working on state-of-the-art laser technologies. In 2017, its technology was used in the first success in generating a special state of matter called a Bose Einstein condensate aboard a sounding rocket. These and other quantum technologies will be used to research quantum optical sensors and other components for bug-proof communication, quantum simulation, quantum-assisted imaging,

Cluster Report Optics and PhotonicsPhotonics for Communications and Sensors 37 Single photon source for quantum experiments © AG Benson, HU Berlin and spectroscopy. Coherent radiation sources are of particular importance for quantum optical applications and as well robustness and reliability for space technologies. FBH is active in this field, from the development of special laser chips to hybrid microintegration and support for users. The Nanooptik AG led by Prof. Oliver Benson at Humboldt University Berlin is investigating the theory of light-matter interaction. They are looking at quantum emitters in solids that generate single photons or exchange them with each other. Optical methods are making it possible to verify the theories of quantum physics with tremendous precision. Particularly important phenomena are entanglement, wave-particle dualism, and other quantum paradoxes such as the quantum Zeno effect. The group is also working on new quantum technologies, such as single quantum light sources on scanning probes for high-resolution spectroscopy and microscopy. They are also developing photon sources and algorithms for a theoretically bug-proof optical data transmission (quantum cryptography). Together with local partners at universities, research institutions, and industry, these new approaches are already being implemented in test tracks and demonstrators. Experiment for measuring the quantum Zeno effect © AG Benson, HU Berlin At the Institute for Solid State Physics of Technical University Berlin, Prof. Stephan Reitzenstein’s research group in optoelectronics and quantum components is developing and researching nanophotonic devices based on semiconductor heterostructures. One focus of the work is the study and targeted application of light-matter interactions in quantum optical regimes, which provide novel functionalities in quantum devices. One example is the development of single photon sources for quantum cryptography. For this purpose, individual semiconductor quantum dots are integrated into nanophotonic structures and optimised for their emission properties using in situ electron beam lithography, a unique technology specially developed by the working group. Further work aims at integrated quantum photonics and ultimate micro- and nanolasers with disappearing laser thresholds. The latter are not only very interesting from the perspective of theoretical physics but can also be used as nanophotonic hardware components in the field of neuromorphic computing.

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