The interaction of a tightly focused laser beam with a step function is encountered in optical storage media, scanning microscopy, positioning and aligning systems, and various other applications. A theoretical and experimental investigation provides an improved description of the physical process and indicates the possibility of achieving extreme superresolution suitable for certain applications.
© 1991 Optical Society of America
Original Manuscript: February 26, 1990
Manuscript Accepted: November 2, 1990
Published: January 15, 1991
Liviu Singher, Joseph Shamir, and Andrei Brunfeld, "Focused-beam interaction with a phase step," Opt. Lett. 16, 61-63 (1991)