Transmission features of frequency-selective components in the far infrared determined by terahertz time-domain spectroscopy.
Transmission and phase-shift characteristics of dichroic high-pass filters with cutoff frequencies as high as 1.11 THz and of a cross-shaped grid bandpass filter with a resonance frequency of 280 GHz were measured with an electro-optic sampling terahertz time-domain spectrometer operating between 0.1 and 2 THz. Good agreement with transmission theories is found. We also compare the transmission performance of cascaded dichroic filters with that of cross-shaped grid bandpass filters. Both types of bandpass filter permit frequency-selective ultrafast experiments in the far-infrared spectral region. In the millimeter and the submillimeter wavelength regions, which are difficult to access by conventional means, knowledge of the frequency response of frequency-selective components is important for applications in frequency mixing, multiplying, and multiplexing in quasi-optical systems.
Winnewisser
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C
Department of Molecular and Optical Physics, University of Freiburg, Hermann-Herder-Strasse 3, D-79104 Freiburg, Germany. Carsten.Winnewisser@physik.unifreiburg.de
Lewen
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F
Weinzierl
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J
Helm
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H