Matthew C. Berrington

Negative refractive index in dielectric crystals containing stoichiometric rare-earth ions

M. Sellars, R. Ahlefeldt, H. Rønnow, 2022, 2205.02739.

Microwave to optical photon conversion via fully concentrated rare-earth-ion crystals

J. Longdell, R. Ahlefeldt, Jonathan R. Everts, 2018, Physical Review A.

Negative Refractive Index in Dielectric Crystals Containing Stoichiometric Rare‐Earth Ions

J. Longdell, A. Laucht, M. Sellars, 2023, Advanced Optical Materials.