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Optics Letters

Optics Letters


  • Editor: Alan E. Willner
  • Vol. 35, Iss. 21 — Nov. 1, 2010
  • pp: 3658–3660

Transmissive quasi-optical Ronchi phase grating for terahertz frequencies

Martin S. Heimbeck, Patrick J. Reardon, John Callahan, and Henry O. Everitt  »View Author Affiliations

Optics Letters, Vol. 35, Issue 21, pp. 3658-3660 (2010)

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A transmissive, square-wave Ronchi phase grating has been fabricated from the dielectric polytetrafluoroethylene to diffract an ~0.7 THz beam quasi-optically. When illuminated by a coherent, cw terahertz (THz) source, the spot separation of the ± 1 diffractive orders and the diffraction efficiency were measured as a function of THz frequency and rotation angle. The grating performance depends sensitively on the refractive index, whose value can be measured with an accuracy limited by the fabrication precision. The use of these gratings for polarization-insensitive quasi-optical imaging and phased arrays is discussed.

© 2010 Optical Society of America

OCIS Codes
(050.1950) Diffraction and gratings : Diffraction gratings
(050.1970) Diffraction and gratings : Diffractive optics
(230.1950) Optical devices : Diffraction gratings
(110.6795) Imaging systems : Terahertz imaging

ToC Category:
Diffraction and Gratings

Original Manuscript: August 12, 2010
Manuscript Accepted: September 16, 2010
Published: October 27, 2010

Martin S. Heimbeck, Patrick J. Reardon, John Callahan, and Henry O. Everitt, "Transmissive quasi-optical Ronchi phase grating for terahertz frequencies," Opt. Lett. 35, 3658-3660 (2010)

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  12. To account for the angular sensitivity of the detector, the calculated η1 was empirically multiplied by 0.95.

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