NDLI: Incident angular dependence of surface plasmon polariton modes for thermal imaging

Content Provider	IET Digital Library
Author	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
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.
Starting Page	1862
Ending Page	1864
Page Count	3
ISSN	00135194
Volume Number	50
e-ISSN	1350911X
Issue Number	Issue 24, Nov (2014)
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/el/50/24
Alternate Webpage(s)	https://digital-library.theiet.org/content/journals/10.1049/el.2014.3153
Journal	Electronics Letters
Publisher Date	2014-11-12
Access Restriction	Open
Rights Holder	© The Institution of Engineering and Technology
Subject Keyword	2D Square Array Bimodal Plasmonic Spectra Splitting Bolometers Detection of Radiation Gold Incident Angle Variation Infrared Imaging Infrared Spectra IR Imaging Lens Lenses Light Collimation Metal Hole Array Metallic Thin Film MHA Optical Array Optical Collimators Optical Collimators And Autocollimators Optical Fabrication Optical Lenses And Mirrors Other Optical System Component PhotoDetector Photoelectric Cell Polaritons SPP Mode SPP Resonance SPP Structure Fabrication Submillimetre Wave Detection Subwavelength Circular Hole Surface Plasmon Polariton Surface Plasmon Polariton Propagation Property Thermal Imaging Transmission Spectra Measurement
Content Type	Text
Resource Type	Article
Subject	Electrical and Electronic Engineering

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