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Nanophotonic Devices

Nanophotonic meta structures can replace thick Bragg-mirrors in vertical-cavity surface emitting lasers (VCSELs). At the same time the mode-profile can be controlled.
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Our goal is to research on novel devices bringing latest findings in solid state physics to application. Challenges are on the micro- and nano-fabrication level as well as deep understanding of device physics and proper modelling. Vertical-cavity surface-emitting lasers (VCSELs) allow easy integration with Silicon with their small footprint in two-dimensional array configuration. Novel high-contrast metastructures, especially the so-called high-contrast gratings (HCGs) are opening new degrees of freedom in device design. One of the core-questions is how to manufacture nanophotonic devices, which are able to transmit at highest data-rates with smallest footprint and highest energy efficiency. The dynamic properties of these devices can be explored by small-signal modulation analysis in the high GHz regime. Their qualification for data-transmission can finally be proved by the system experiment, which, however, is dependent on the device, the coding scheme, the drivers and the used waveguide as well.

Experimental facilities: Cleanrooms class ISO 5 to ISO 3, Dry etching (RIE, ICP, PECVD), Contact Lithography, Wet Chemistry, Metallization, Electron-Beam Lithography, Scanning Electron Microscopy, Wafer Prober for VCSELs, RF-Lab equipment, Small-Signal Measurement (VNA 40 GHz), Large-Signal Setup (55 Gbps NRZ), ...

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