We propose an artificial birefringent terahertz (THz) device constructed by subwavelength L-shaped hole arrays on a single metallic layer. This structure is able to work as a polarizer when the incident frequency is between the cut-off frequencies of two eigenmodes. When the incident wave is beyond cut-off frequencies of these two modes, it can be designed as an efficient half- or quarter-wave plate with extraordinary transmission properties. A big effective index difference from 0.254 to 0.768 is obtained using a subwavelength-thick planar structure, which can reduce the thickness of the device to one tenth of conventional quartz birefringent crystals for THz waves.
© 2014 Optical Society of America
Original Manuscript: September 24, 2013
Revised Manuscript: December 4, 2013
Manuscript Accepted: December 4, 2013
Published: January 8, 2014
Lei Wang, Suhua Jiang, Haifeng Hu, Haomin Song, Wei Zeng, and Qiaoqiang Gan, "Artificial birefringent metallic planar structures for terahertz wave polarization manipulation," Opt. Lett. 39, 311-314 (2014)
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