Showing 2025Show all
2 papers · 1 filter
physics.optics2025
Inverse-Designed Grating Couplers with Tunable Wavelength via Scaling and Biasing
Lorenz J. J. Sauerzopf, Fabian Becker, Kai Müller
Photonic integrated circuits are heavily researched devices for telecommunication, biosensing, and quantum technologies. Wafer-scale fabrication and testing are crucial for reducin…
cond-mat.mtrl-sci2025
Zeeman Spectroscopy of Vacancy-Charge-Compensated Er3+ Sites in CaWO4 under Vector Magnetic Fields
Fabian Becker, Sudip KC, Lorenz J. J. Sauerzopf +4
We present polarization-resolved optical absorption measurements on Er3+ ions in CaWO4 under vector magnetic fields, focusing on charge-compensated sites arising from local Ca2+ va…