We show that lanthanide-doped crystals can be made left handed for a finite spectral range. The electronic transitions in the dopant ions are both dipolar electric and dipolar magnetic allowed. This enables tuning the permittivity and the permeability at the same frequency. The analysis focuses on erbium-doped crystals where left-handed properties are predicted inside an experimentally reachable domain of parameters.
© 2006 Optical Society of America
Original Manuscript: January 24, 2006
Revised Manuscript: March 19, 2006
Quentin Thommen and Paul Mandel, "Left-handed properties of erbium-doped crystals," Opt. Lett. 31, 1803-1805 (2006)