We have demonstrated that a thin planar coating with randomly distributed index gradients can create diffuse reflections in front of a planar conducting sheet. This scheme is verified by two-dimensional near-field scanning measurement, in which the randomly gradient index coating is implemented by periodic crossed-I-shaped array whose unit cell’s dimension varies spatially. Some qualitative principles of choosing the distribution mode of random index gradient are presented.
© 2010 Optical Society of America
Original Manuscript: November 24, 2009
Revised Manuscript: January 17, 2010
Manuscript Accepted: January 29, 2010
Published: March 4, 2010
Xin Mi Yang, Xiao Yang Zhou, Qiang Cheng, Hui Feng Ma, and Tie Jun Cui, "Diffuse reflections by randomly gradient index metamaterials," Opt. Lett. 35, 808-810 (2010)