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.

A Fast Terahertz Spectrometer Based on Frequency Selective Surface Filters / P., Carelli; F., Chiarello; S., Cibella; A., Di Gaspare; R., Leoni; Ortolani, Michele; G., Torrioli. - In: JOURNAL OF INFRARED, MILLIMETER, AND TERAHERTZ WAVES. - ISSN 1866-6892. - STAMPA. - 33:(2012), pp. 505-512. [10.1007/s10762-012-9884-z]

A Fast Terahertz Spectrometer Based on Frequency Selective Surface Filters

ORTOLANI, MICHELE;
2012

Abstract

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.
2012
01 Pubblicazione su rivista::01a Articolo in rivista
A Fast Terahertz Spectrometer Based on Frequency Selective Surface Filters / P., Carelli; F., Chiarello; S., Cibella; A., Di Gaspare; R., Leoni; Ortolani, Michele; G., Torrioli. - In: JOURNAL OF INFRARED, MILLIMETER, AND TERAHERTZ WAVES. - ISSN 1866-6892. - STAMPA. - 33:(2012), pp. 505-512. [10.1007/s10762-012-9884-z]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/649655
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