Incident angular dependence of surface plasmon polariton modes for thermal imaging

Title
Incident angular dependence of surface plasmon polariton modes for thermal imaging
Author(s)
김종수윤수진황정우[황정우]김준오[김준오]강상우[강상우]장우영[장우영]Michael Noyola[Michael Noyola]Augustine Urbas[Augustine Urbas]구자현[구자현]이상준[이상준]
Issue Date
201411
Publisher
INST ENGINEERING TECHNOLOGY-IET
Citation
ELECTRONICS LETTERS, v.50, no.24, pp.1862 - U229
Abstract
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.
URI
http://hdl.handle.net/YU.REPOSITORY/30482http://dx.doi.org/10.1049/el.2014.3153
ISSN
0013-5194
Appears in Collections:
이과대학 > 물리학과 > Articles
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