A terahertz-wave subwavelength polarization rotator based on metamaterials

Yi-Ju Chiang; Ta-Jen Yen

doi:10.1117/12.929406

15 October 2012 A terahertz-wave subwavelength polarization rotator based on metamaterials

Yi-Ju Chiang, Ta-Jen Yen

Proceedings Volume 8496, Terahertz Emitters, Receivers, and Applications III; 84960M (2012) https://doi.org/10.1117/12.929406
Event: SPIE Optical Engineering + Applications, 2012, San Diego, California, United States

Abstract

We experimentally demonstrate an ultrathin polarization rotator (PR) capable of rotating linearly polarized radiation 90 degrees in the terahertz-gap region by integrating the polarization conversion property from asymmetric split-ring resonators (ASRRs) and the polarization selectivity from S-shape resonators (SRs). This ultrathin-PR possesses a nearly complete polarization conversion up to 97.7% at 1.04 THz and a high conversion transmission coefficient of 0.48, enhanced by a constructive Febry-Perot interference between the ASRRs and the SRs. Furthermore, the overall thickness of the ultrathin PR is about 50 μm, only one-sixth of the incident wavelength, so that the associated optical devices can be miniaturized. The simple metal-dielectric-metal trilayered structure of the ultrathin-PR allows the tolerance of translational misalignment between the ASRRs and SRs and hence significantly facilitates the fabrication process.

Citation Download Citation

Yi-Ju Chiang and Ta-Jen Yen "A terahertz-wave subwavelength polarization rotator based on metamaterials", Proc. SPIE 8496, Terahertz Emitters, Receivers, and Applications III, 84960M (15 October 2012); https://doi.org/10.1117/12.929406

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