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Far-infrared bands in plasmonic metal-insulator-metal absorbers optimized for long-wave infrared

Published online by Cambridge University Press:  24 January 2019

Rachel N. Evans ,
Seth R. Calhoun ,
Jonathan R. Brescia ,
Justin W. Cleary ,
Evan M. Smith  and
Robert E. Peale
Rachel N. Evans*
Affiliation:
Physics Department, University of Central Florida, Orlando, FL32816, U.S.A.
Seth R. Calhoun
Affiliation:
Physics Department, University of Central Florida, Orlando, FL32816, U.S.A.
Jonathan R. Brescia
Affiliation:
Physics Department, University of Central Florida, Orlando, FL32816, U.S.A.
Justin W. Cleary
Affiliation:
Air Force Research Laboratory, Sensors Directorate, Wright-Patterson AFB, OH45433, U.S.A.
Evan M. Smith
Affiliation:
Air Force Research Laboratory, Sensors Directorate, Wright-Patterson AFB, OH45433, U.S.A. KBRwyle, Beavercreek, OH45440, U.S.A.
Robert E. Peale
Affiliation:
Physics Department, University of Central Florida, Orlando, FL32816, U.S.A.
*
*(Email: [email protected])
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Abstract

Metal–insulator–metal (MIM) resonant absorbers comprise a conducting ground plane, a dielectric of thickness t, and thin separated metal top-surface structures of dimension l. The fundamental resonance wavelength is predicted by an analytic standing-wave model based on t, l, and the dielectric refractive index spectrum. For the dielectrics SiO2, AlN, and TiO2, values for l of a few microns give fundamental resonances in the 8-12 μm long-wave infrared (LWIR) wavelength region. Agreement with theory is better for t/l exceeding 0.1. Harmonics at shorter wavelengths were already known, but we show that there are additional resonances in the far-infrared 20 - 50 μm wavelength range in MIM structures designed to have LWIR fundamental resonances. These new resonances are consistent with the model if far-IR dispersion features in the index spectrum are considered. LWIR fundamental absorptions are experimentally shown to be optimized for a ratio t/l of 0.1 to 0.3 for SiO2- and AlN-based MIM absorbers, respectively, with TiO2-based MIM optimized at an intermediate ratio.

Keywords

plasmonic
Type
Articles
Information
MRS Advances , Volume 4 , Issue 11-12: Electronic, Photonic and Magnetic Materials , 2019 , pp. 667 - 674
Copyright
Copyright © Materials Research Society 2019 

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References

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