Terahertz bandpass filters using double-stacked metamaterial layers

Bandpass filters are reported based on double-stacked metamaterial layers separated by an air gap for operation at terahertz frequencies. Several stacking configurations were investigated designed for a ~0.5 THz center frequency. The filters exhibited improved spectral transmission properties when c...

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Bibliographic Details
Published in:Optics letters 2012-02, Vol.37 (3), p.296-298
Main Authors: Zhu, Yanhan, Vegesna, Subash, Kuryatkov, Vladimir, Holtz, Mark, Saed, Mohammad, Bernussi, Ayrton A
Format: Article
Language:English
Subjects:
Asymmetry
Bandpass filters
Double layer
Metamaterials
Models, Theoretical
Noise levels
Optical Phenomena
Sidelobes
Spectra
Terahertz frequencies
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Summary:Bandpass filters are reported based on double-stacked metamaterial layers separated by an air gap for operation at terahertz frequencies. Several stacking configurations were investigated designed for a ~0.5 THz center frequency. The filters exhibited improved spectral transmission properties when compared with conventional ones based on single metamaterial layers. 3 dB bandwidth of ~78 GHz and sidelobe suppression ratio >16 dB were determined when symmetric or asymmetric double layers were stacked. We demonstrate that superior frequency selectivity can be achieved when metamaterial layers with different unit cells are used. Good agreement was found between measured and simulated transmission response.
ISSN:0146-9592
1539-4794
DOI:10.1364/OL.37.000296