We analyze the optical (or microwave) tunneling properties of electromagnetic waves passing through thin films presenting a specific index profile that provides a cutoff frequency when the films are used below this frequency. We show that, contrary to the usual case of a square index profile, where tunneling is accompanied by a strong attenuation of the wave due to reflection, such films present the possibility of reflectionless tunneling, where the incoming intensity is totally transmitted.
© 2006 Optical Society of America
Original Manuscript: December 7, 2005
Revised Manuscript: January 11, 2006
Manuscript Accepted: January 11, 2006
Alexander B. Shvartsburg and Guillaume Petite, "Reflectionless tunneling of light in gradient optics," Opt. Lett. 31, 1127-1129 (2006)