Abstract-Achromatic wave plate in THz frequency region based on parallel metal plate waveguides with a pillar array

Masaya Nagai, Noriyuki Mukai, Yosuke Minowa, Masaaki Ashida, Takehito Suzuki, Jun Takayanagi, and Hideyuki Ohtake  »View Author Affiliations

http://www.opticsinfobase.org/oe/abstract.cfm?uri=oe-23-4-4641

Optics Express, Vol. 23, Issue 4, pp. 4641-4649 (2015)
http://dx.doi.org/10.1364/OE.23.004641

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We demonstrated an achromatic wave plate based on parallel metal plate waveguides in the high THz frequency region. The metal plates have periodic rough structures on the surface, which allow slow transverse magnetic wave propagation and fast transverse electric wave propagation. A numerical simulation showed that the height of the periodic roughness is important for optimizing the birefringence. We fabricated stacked metal plates containing two types of structures by chemical etching. An array of small pillars on the metal plates allows higher frequency optimization. We experimentally demonstrated an achromatic quarter-wave plate in the frequency region from 2.0 to 3.1 THz.

© 2015 Optical Society of America