We studied the propagation length of surface plasmon polaritons (SPPs) at the gold/air interface in the mid-infrared range. We showed that SPPs propagate for a distance of about or above 10 mm at a wavelength of 10.6 μm, in good agreement with the value predicted from the dielectric constant of polycrystalline gold. We also demonstrated that a simple treatment of thermal annealing led to noticeable elongation of SPP propagation length, accompanied by increased grain size and decreased surface roughness. Quantitative evaluation of SPP propagation length, in correlation with material's morphology, is important in designing plasmonic devices and beneficial for understanding the mechanisms of SPP's losses that underlie electric-field enhancement.
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7 November 2016
Research Article|
November 04 2016
Propagation length of mid-infrared surface plasmon polaritons on gold: Impact of morphology change by thermal annealing
Nobuyoshi Hiramatsu;
Nobuyoshi Hiramatsu
1Institute of Industrial Science,
the University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
2Department of Applied Physics, Faculty of Engineering,
The University of Tokyo
, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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Fumiya Kusa;
Fumiya Kusa
1Institute of Industrial Science,
the University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
3Department of Applied Physics,
Tokyo University of Agriculture and Technology
, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
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Kotaro Imasaka;
Kotaro Imasaka
1Institute of Industrial Science,
the University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Ikki Morichika;
Ikki Morichika
1Institute of Industrial Science,
the University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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Akinobu Takegami;
Akinobu Takegami
1Institute of Industrial Science,
the University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
3Department of Applied Physics,
Tokyo University of Agriculture and Technology
, 2-24-16 Nakacho, Koganei, Tokyo 184-8588, Japan
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Satoshi Ashihara
Satoshi Ashihara
a)
1Institute of Industrial Science,
the University of Tokyo
, 4-6-1 Komaba, Meguro-ku, Tokyo 153-8505, Japan
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a)
Electronic mail: [email protected]
J. Appl. Phys. 120, 173103 (2016)
Article history
Received:
August 25 2016
Accepted:
October 20 2016
Citation
Nobuyoshi Hiramatsu, Fumiya Kusa, Kotaro Imasaka, Ikki Morichika, Akinobu Takegami, Satoshi Ashihara; Propagation length of mid-infrared surface plasmon polaritons on gold: Impact of morphology change by thermal annealing. J. Appl. Phys. 7 November 2016; 120 (17): 173103. https://doi.org/10.1063/1.4966934
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