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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 17, Iss. 5 — Mar. 2, 2009
  • pp: 3063–3077

Broadband antireflective structures applied to high resistive float zone silicon in the THz spectral range

Claudia Brückner, Thomas Käsebier, Boris Pradarutti, Stefan Riehemann, Gunther Notni, Ernst-Bernhard Kley, and Andreas Tünnermann  »View Author Affiliations

Optics Express, Vol. 17, Issue 5, pp. 3063-3077 (2009)

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The optimal structural parameters for an antireflective structure in high resistive float zone silicon are deduced for a rectangular and a hexagonal structure. For this the dependence of the effective index from the filling factor was calculated for both grating types. The structures were manufactured by the Bosch®-process. The required structural parameters for a continuous profile require an adaption of the fabrication process. Challenges are the depth and the slight positive slope of the structures. Starting point for the realization of the antireflective structures was the manufacturing of deep binary gratings. A rectangular structure and a hexagonal structure with period 50 μm and depth 500 μm were realized. Measurements with a THz time domain spectroscopy setup show an increase of the electric field amplitude of 15.2% for the rectangular grating and 21.76% for the hexagonal grating. The spectral analysis shows that the bandwidth of the hexagonal grating reaches from 0.1 to 2 THz.

© 2009 Optical Society of America

OCIS Codes
(310.1210) Thin films : Antireflection coatings
(050.6624) Diffraction and gratings : Subwavelength structures

ToC Category:
Diffraction and Gratings

Original Manuscript: November 13, 2008
Revised Manuscript: December 15, 2008
Manuscript Accepted: January 14, 2009
Published: February 17, 2009

Claudia Brückner, Thomas Käsebier, Boris Pradarutti, Stefan Riehemann, Gunther Notni, Ernst-Bernhard Kley, and Andreas Tünnermann, "Broadband antireflective structures applied to high resistive float zone silicon in the THz spectral range," Opt. Express 17, 3063-3077 (2009)

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