TY - JOUR
T1 - Terahertz path-length lens composed of oblique metal slit array
AU - Togashi, Takahisa
AU - Kitahara, Hideaki
AU - Takano, Keisuke
AU - Hangyo, Masanori
AU - Mita, Mamoru
AU - Young, John C.
AU - Suzuki, Takehito
N1 - Publisher Copyright:
© 2014, Springer-Verlag Berlin Heidelberg.
PY - 2014/2
Y1 - 2014/2
N2 - Need for high-performance and sophisticated optical devices in the terahertz wave band is growing rapidly with terahertz technological progress. This paper presents a lens in the terahertz wave band based on phase control using an oblique metal slit array. A convex oblique slit array can produce a focusing effect. This focusing effect is confirmed by full-wave analysis for the designed terahertz path-length lens. The effective refractive index computed from the full-wave analysis is consistent with analytical expressions and changes from 1.00 to 1.56 with the angle of the metal slit array. Full-wave analysis also confirms that the lamination errors of the path-length lens have limited influence on the focusing effects. The robustness of the lens design is essential for its industrial applications to terahertz optical devices.
AB - Need for high-performance and sophisticated optical devices in the terahertz wave band is growing rapidly with terahertz technological progress. This paper presents a lens in the terahertz wave band based on phase control using an oblique metal slit array. A convex oblique slit array can produce a focusing effect. This focusing effect is confirmed by full-wave analysis for the designed terahertz path-length lens. The effective refractive index computed from the full-wave analysis is consistent with analytical expressions and changes from 1.00 to 1.56 with the angle of the metal slit array. Full-wave analysis also confirms that the lamination errors of the path-length lens have limited influence on the focusing effects. The robustness of the lens design is essential for its industrial applications to terahertz optical devices.
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U2 - 10.1007/s00339-014-8918-x
DO - 10.1007/s00339-014-8918-x
M3 - Article
AN - SCOPUS:84925501183
SN - 0947-8396
VL - 118
SP - 397
EP - 402
JO - Applied Physics A: Materials Science and Processing
JF - Applied Physics A: Materials Science and Processing
IS - 2
ER -