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

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 simulat...

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Bibliographic Details
Published in:	Optics express Vol. 23; no. 4; pp. 4641 - 4649
Main Authors:	Nagai, Masaya, Mukai, Noriyuki, Minowa, Yosuke, Ashida, Masaaki, Suzuki, Takehito, Takayanagi, Jun, Ohtake, Hideyuki
Format:	Journal Article
Language:	English
Published:	United States 23-02-2015
Online Access:	Get full text
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Summary:	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.
Bibliography:	ObjectType-Article-1 SourceType-Scholarly Journals-1 ObjectType-Feature-2 content type line 23
ISSN:	1094-4087 1094-4087
DOI:	10.1364/OE.23.004641