@article{AhibozAndresenManleyetal.2021, author = {Doguscan Ahiboz and Elina Andresen and Phillip Manley and Ute Resch-Genger and Christian W{\"u}rth and Christiane Becker}, title = {Metasurface-Enhanced Photon Upconversion upon 1550 nm Excitation}, journal = {Adv. Opt. Mater.}, volume = {9}, pages = {2101285}, doi = {10.1002/adom.202101285}, year = {2021}, }