Tunable Fabry-Perot THz filter with sub-wavelength grating mirrors

被引：0

作者：

Goebel, Thorsten ^{[1
]}

Schoenherr, Daniel ^{[1
]}

Sydlo, Cezary ^{[1
]}

Roggenbuck, Axel ^{[2
]}

Deninger, Anselm ^{[2
]}

Meissner, Peter ^{[1
]}

Hartnagel, Hans-Ludwig ^{[1
]}

机构：

[1] Tech Univ Darmstadt, Merckstr 25, D-64283 Darmstadt, Germany

[2] Topt Photon AG, D-82166 Graefelfing, Germany

来源：

PHOTONIC CRYSTAL MATERIALS AND DEVICES VIII | 2008年 / 6989卷

关键词：

sub-wavelength grating; Fabry-Perot filter; tunable THz filter;

D O I：

10.1117/12.781127

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

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.

引用

页数：8

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