Incident angular dependence of surface plasmon polariton modes for thermal imaging

In the authors' previous work, the effect of a plasmonic metal hole array (MHA) as integrated on the infrared (IR) photodetector was demonstrated and its performance particularly at a normal incidence was analysed. However, in IR imaging, the associated optics or lens focuses and collimates the...

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Bibliographic Details
Published in:Electronics letters 2014-11, Vol.50 (24), p.1862-1864
Main Authors: Yoon, Sujin, Hwang, Jeongwoo, Kim, Jong Su, Kim, Jun Oh, Kang, Sang-Woo, Jang, Woo-Yong, Noyola, Michael, Urbas, Augustine, Ku, Zahyun, Lee, Sang Jun
Format: Article
Language:English
Subjects:
2D square array
Arrays
bimodal plasmonic spectra splitting
gold
Imaging
Incidence
incident angle variation
infrared imaging
Infrared radiation
infrared spectra
IR imaging
lens
lenses
light collimation
metal hole array
metallic thin films
MHA
optical arrays
optical collimators
optical fabrication
Photonics
Plasmonics
Plasmons
Polaritons
Spectra
SPP modes
SPP resonance
SPP structure fabrication
subwavelength circular hole
surface plasmon polariton
surface plasmon resonance
thermal imaging
transmission spectra measurement
Two dimensional
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Summary:In the authors' previous work, the effect of a plasmonic metal hole array (MHA) as integrated on the infrared (IR) photodetector was demonstrated and its performance particularly at a normal incidence was analysed. However, in IR imaging, the associated optics or lens focuses and collimates the light to the detector, which in turn causes the incident light to bend with various angles. Since the MHA is integrated on top of the detector, it is critical to investigate its sensitivity against the angle of incidence and how it impacts the overall sensing capability. The splitting of the surface plasmon polariton (SPP) resonances due to MHA is reported here, since the incident angle varies. In the experiment, the SPP structure has been fabricated by a two-dimensional (2D) square array of subwavelength circular holes penetrating the gold film. The transmission spectra of the SPP structure in a mid-IR range have been measured for various incident angles. An interesting phenomenon is observed here, that is, the first- and second-order bimodal plasmonic spectra split into three or more peaks as the incident angle increases. Consistency in the experimental results with the simulation is found.
ISSN:0013-5194
1350-911X
1350-911X
DOI:10.1049/el.2014.3153