Highly absorbing nano-scale metal films for terahertz
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Authors
Alves, Fabio
Karamitros, Apostolos
Grbovic, Dragoslav
Kearney, Brian
Karunasiri, Gamani
Subjects
metal films
terahertz
sensors
thin films
terahertz
sensors
thin films
Advisors
Date of Issue
2011-09-07
Date
Publisher
SPIE
Language
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.
Type
Article
Description
The article of record as published may be found at http://dx.doi.org/10.1117/12.894088
Series/Report No
Department
Physics
Organization
Naval Postgraduate School (U.S.)
Identifiers
NPS Report Number
Sponsors
NRO
ONR
AFOSR
ONR
AFOSR
Funder
Format
8 p.
Citation
Distribution Statement
Rights
This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States.