Radiationless interference of an electromagnetic wave occurs in the near field when the feature sizes of the waves are at the deep subwavelength scale. We present the propagation in such a regime using a wave-vector space picture. Using this picture, we reproduce the condition to achieve near-field focusing. We also design the initial field distribution needed for near-field beaming, where an intensity distribution maintains its shape as it propagates. We conclude the discussion by proposing a possible implementation of the near-field beaming scheme.
© 2009 Optical Society of America
Optics at Surfaces
Original Manuscript: June 18, 2009
Manuscript Accepted: July 24, 2009
Published: September 24, 2009
Varat Intaraprasonk and Shanhui Fan, "Wave-vector space picture for radiationless focusing and beaming," Opt. Lett. 34, 2967-2969 (2009)