4 papers
Optical Spectroscopy of Waveguide coupled Er ensembles in CaWO and YVO
Fabian Becker, Anna Selzer, Lorenz J. J. Sauerzopf +4
We present an optical study of near-surface Er ensembles in waveguide-integrated CaWO and YVO, investigating how nanophotonic coupling modifies rare-earth spectrosco…
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…
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…
Spectroscopic Investigations of Multiple Environments in Er:CaWO4 through Charge Imbalance
Fabian Becker, Catherine L. Curtin, Sudip KC +4
We present a detailed spectroscopic study of the and Er multiplets of Er:CaWO grown without a co-dopant. Using photoluminesce…