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THz Discrimination of Materials: Development of an Apparatus Based on Room Temperature Detection and Metasurfaces Selective Filters

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Abstract

We present an apparatus for terahertz discrimination of materials designed to be fast, simple, compact, and economical in order to be suitable for preliminary on-field analysis. The system working principles, bio-inspired by the human vision of colors, are based on the use of an incoherent source, a room temperature detector, a series of microfabricated metamaterials selective filters, a very compact optics based on metallic ellipsoidal mirrors in air, and a treatment of the mirrors’ surfaces that select the frequency band of interest. We experimentally demonstrate the operation of the apparatus in discriminating simple substances such as salt, staple foods, and grease. We present the system and the obtained results and discuss issues and possible developments.

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Acknowledgments

The presented work was partially supported by the Italian Defense Ministry under the project P.N.R.M. n. a2012.169 and by Crisel s.r.l. We thank E. Finocchiaro and C. Florio for useful discussions, A. Nucara for FTIR measurements, F. Del Grande for mechanical support, F. Bertani for useful suggestions on PCA, and A. Marletta.

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Authors and Affiliations

  1. DSFC, Università dell’Aquila, via Vetoio snc, 67100, L’Aquila, Italy

    P. Carelli

  2. IFN-CNR, via Cineto Romano 42, 00156, Rome, Italy

    P. Carelli, F. Chiarello, G. Torrioli & M. G. Castellano

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  1. P. Carelli
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  2. F. Chiarello
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  3. G. Torrioli
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  4. M. G. Castellano
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Correspondence to F. Chiarello.

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Carelli, P., Chiarello, F., Torrioli, G. et al. THz Discrimination of Materials: Development of an Apparatus Based on Room Temperature Detection and Metasurfaces Selective Filters. J Infrared Milli Terahz Waves 38, 303–313 (2017). https://doi.org/10.1007/s10762-016-0343-0

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  • DOI: https://doi.org/10.1007/s10762-016-0343-0

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