We here propose the concept of enhanced evanescent tunneling (EET). Our analysis indicates that by means of a suitable control field, the transmission of evanescent waves across a forbidden gap can be enhanced by several orders of magnitude—well beyond the ordinary frustrated total internal reflection case. We show how such a phenomenon can be used to probe both the amplitude and phase of the evanescent portion of the angular spectrum, thereby allowing target superresolution. In principle EET can be manifested in other areas of physics where wave tunneling is involved.
© 2011 Optical Society of America
Optics at Surfaces
Original Manuscript: November 30, 2010
Revised Manuscript: January 11, 2011
Manuscript Accepted: January 12, 2011
Published: February 7, 2011
Alessandro Salandrino and Demetrios N. Christodoulides, "Superresolution via enhanced evanescent tunneling," Opt. Lett. 36, 487-489 (2011)