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Proceedings Paper

Tunable Fabry-Perot THz filter with sub-wavelength grating mirrors
Author(s): Thorsten Goebel; Daniel Schoenherr; Cezary Sydlo; Axel Roggenbuck; Anselm Deninger; Peter Meissner; Hans-Ludwig Hartnagel
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Paper Abstract

We utilize the reflectivity of one-dimensional metal gratings with sub-wavelength slits to realize mirrors for THz frequencies. Two of them are combined to a Fabry-Perot filter, which features the corresponding transmission bands. By appropriate choice of dimensions, the extraordinary transmission resonance of the sub-wavelength gratings can be superimposed with the Fabry-Perot peak. By varying the resonator length between the grating mirrors, the overlap of both transmission peaks can be controlled. This enables the tuning of the filter bandwidth. The theoretical analysis shows that continuous tuning of the filter bandwidth up to 30% is possible for a two mirror stage. For the performance of comparative measurements, an all-fiber continuous-wave THz system is used. The experimental results are in fairly well agreement with the theoretically predicted tuning properties.

Paper Details

Date Published: 21 April 2008
PDF: 8 pages
Proc. SPIE 6989, Photonic Crystal Materials and Devices VIII, 698911 (21 April 2008); doi: 10.1117/12.781127
Show Author Affiliations
Thorsten Goebel, Technische Univ. Darmstadt (Germany)
Daniel Schoenherr, Technische Univ. Darmstadt (Germany)
Cezary Sydlo, Technische Univ. Darmstadt (Germany)
Axel Roggenbuck, Toptica Photonics AG (Germany)
Anselm Deninger, Toptica Photonics AG (Germany)
Peter Meissner, Technische Univ. Darmstadt (Germany)
Hans-Ludwig Hartnagel, Technische Univ. Darmstadt (Germany)


Published in SPIE Proceedings Vol. 6989:
Photonic Crystal Materials and Devices VIII
Richard M. De La Rue; Ceferino López; Michele Midrio; Pierre Viktorovitch, Editor(s)

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