Abstract-Superconductivity Induced Transparency in Terahertz Metamaterials

Odeta Limaj , Flavio Giorgianni , Alessandra Di Gaspare , Valeria Giliberti , Gianluca De Marzi ,Pascale Roy , Michele Ortolani , Xiaoxing Xi , Daniel Cunnane , and Stefano Lupi

http://pubs.acs.org/doi/abs/10.1021/ph500104k?journalCode=apchd5

Plasmonic analogue of Electromagnetically Induced Transparency is activated and tuned in the terahertz (THz) range in asymmetric metamaterials fabricated out of high critical temperature (Tc) superconductor thin films. The asymmetric design provides a near-field coupling between a superradiant and a subradiant plasmonic mode, which has been widely tuned through superconductivity and monitored by Fourier Transform Infrared spectroscopy. The sharp transparency window which appears in the extinction spectrum exhibits a relative modulation up to 50% activated by temperature change. The interplay between ohmic and radiative damping, which can be independently tuned and controlled, allows for engineering the electromagnetically induced transparency of the metamaterial far beyond the current state-of-the-art, which relies on standard metals or low-Tc superconductors.