A Fast Terahertz Spectrometer Based on Frequency Selective Surface Filters

作者：Carelli P; Chiarello F; Cibella S; Di Gaspare A; Leoni R; Ortolani M^*; Torrioli G

来源：Journal of Infrared Millimeter and Terahertz Waves, 2012, 33(5): 505-512.

DOI：10.1007/s10762-012-9884-z

• Metamaterials
• Superconducting bolometer
• Bandpass filter
• Video-rate spectroscopy

We present a fast spectrometer working in the 0.7-4.8 THz range. Broadband radiation from a blackbody source is focused first on a rotating silicon wafer, whose surface was patterned with 18 metal band-pass filters, then on the sample under test and finally is detected by a superconducting microbolometer with microsecond time constant. The bolometer sensor is coupled to a spiral antenna whose frequency band matches the spectral range of the filters. The spectral resolution is set by the filters quality factor of about 3. A dynamic range of 100 and a S/N ratio of 20 are achieved by integrating for less than 10 second. The detector can operate up to 6 K in a closed-cycle cooler, hence making the present apparatus suitable for building up a simple terahertz video-rate spectrometer.

• 出版日期2012-5