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Applied Optics

Applied Optics


  • Vol. 37, Iss. 10 — Apr. 1, 1998
  • pp: 1862–1866

Terahertz-wave antireflection coating on Ge and GaAs with fused quartz

Kodo Kawase and Norihisa Hiromoto  »View Author Affiliations

Applied Optics, Vol. 37, Issue 10, pp. 1862-1866 (1998)

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In the terahertz-wave region, fabrication of an antireflection (AR) coating is difficult because it must be as thick as several tens of micrometers, which is far thicker than that used in the optical region. We discuss a lapping method for fabricating an AR layer with a desired thickness for terahertz-wave optical devices. To demonstrate this method, we glued a thin fused-quartz plate to a surface of an undoped Ge or GaAs wafer and polished it to a thickness of one-quarter wavelength. This reduced the reflectivity of the AR surface to 1/720 of the reflection of an uncoated surface, as expected from optical theory.

© 1998 Optical Society of America

OCIS Codes
(260.3090) Physical optics : Infrared, far
(310.1210) Thin films : Antireflection coatings
(350.7420) Other areas of optics : Waves

Original Manuscript: August 26, 1997
Revised Manuscript: November 7, 1997
Published: April 1, 1998

Kodo Kawase and Norihisa Hiromoto, "Terahertz-wave antireflection coating on Ge and GaAs with fused quartz," Appl. Opt. 37, 1862-1866 (1998)

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