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Thermally tunable filter for terahertz range based on a one-dimensional photonic crystal with a defect

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7 Author(s)
Nemec, H. ; Laboratoire d’Hyperfréquences et de Caractérisation, Université de Savoie, 73376 Le Bourget du Lac Cedex, France ; Duvillaret, L. ; Garet, F. ; Kuzel, P.
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A high-quality smart filter for terahertz range with relative tunability reaching 20% has been demonstrated. The filter is based on a narrow transmission band, which originates from a defect mode that appears due to insertion of a single crystal of KTaO3 into otherwise periodic one-dimensional photonic crystal. Frequencies of defect modes are controlled by the refractive index of the defect: their high tunability is achieved by the strong temperature dependence of the dielectric properties of KTaO3. The low losses of KTaO3 lead to a high peak transmission of the filter. Influence of the defect losses on the properties of the filter is also discussed.

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Journal of Applied Physics  (Volume:96 ,  Issue: 8 )