Highly absorbing nano-scale metal films for terahertz

Fabio Alves; Apostolos Karamitros; Dragoslav Grbovic; Brian Kearney; Gamani Karunasiri

doi:10.1117/12.894088

7 September 2011 Highly absorbing nano-scale metal films for terahertz

Fabio Alves, Apostolos Karamitros, Dragoslav Grbovic, Brian Kearney, Gamani Karunasiri

Proceedings Volume 8119, Terahertz Emitters, Receivers, and Applications II; 81190K (2011) https://doi.org/10.1117/12.894088
Event: SPIE Photonic Devices + Applications, 2011, San Diego, California, United States

Abstract

Our work aims to identify nano-scale metal films with enhanced absorption between 1 to 10 THz for use in thermal imagers operating in this spectral band. Absorption measurements of chromium and nickel films with different thicknesses (8 - 30 nm) revealed absorption as high as 40% (Cr) and 27% (Ni) between 3 and 9 THz. Further analysis showed that it is possible to optimize absorption by controlling conductivity of metal films by patterning them to reduce fill factor. This design flexibility allows tailoring of the absorbing layer to reduce residual stress of membranes used in microbolmeter and bi-material thermal sensors.

Citation Download Citation

Fabio Alves, Apostolos Karamitros, Dragoslav Grbovic, Brian Kearney, and Gamani Karunasiri "Highly absorbing nano-scale metal films for terahertz", Proc. SPIE 8119, Terahertz Emitters, Receivers, and Applications II, 81190K (7 September 2011); https://doi.org/10.1117/12.894088

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