We show that the polarization of linearly polarized light can be rotated an arbitrary angle by double-layer metal hole array structures in a subwavelength regime. The transmitted light with the rotated polarization, however, remains of nearly the same strength as the incident field at particular frequencies. The mechanism can be attributed to the subwavelength feature of the rectangular holes, and the tangential guiding modes between layers modulated by the orientation of the holes. The structures have potential applications as polarization rotators in a broad frequency range covering from terahertz (THz) to infrared frequencies.
© 2012 Optical Society of America
Original Manuscript: June 4, 2012
Revised Manuscript: July 19, 2012
Manuscript Accepted: July 20, 2012
Published: August 24, 2012
X. Xiao, Y. Li, B. Hou, B. Zhou, and W. Wen, "Subwavelength polarization rotators via double-layer metal hole arrays," Opt. Lett. 37, 3594-3596 (2012)