Mutual Optical Transparency through Quantum Wells in Strong Terahertz Fields

Abstract

PACS: 71.35.Cc; 73.50.Fq; 78.67.De Dedicated to Professor Dr. Roland Zimmermann on the occasion of his 60th birthdayIn the presence of a strong THz field, the exciton wavefunctions in a quantum well are described by Floquet states. As a consequence, exciton states dressed by a THz field have multiple optical resonances. If an optical beam is resonant with any of these frequencies, the beam is attenuated upon its transmission. Here we show that one can judiciously choose two coherent optical beams tuned to two different resonant frequencies, so that the beams produce no interband excitation, and thus are unattenuated.