کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5449731 | 1512536 | 2017 | 6 صفحه PDF | دانلود رایگان |
- Achieved an optimized linewidth of 39 nm at 3.17 μm with near unity absorption.
- The structure can be used to achieve polarization control of infrared detection.
- The structure can go through realistic nanofabrication processes.
We have investigated numerically a narrowband near unity mid-infrared absorber based on a periodic array of gold split cross antenna backed by a dielectric spacer and a gold backmirror. We systematically studied the spectral dependence on the antenna parameters and explored the optimized parameters for nanofabrication. The optimized structure has a linewidth of 39 nm at 3.17 µm and the peak absorption is 96.5%. This can be explained in terms of surface lattice resonance of the periodic structure. The investigated structure can be devised as a mid-infrared refractive index sensor. Due to the strong near field enhancement and spectral dependence on the surface dielectric conditions, the narrow linewidth arises from the coupled plasmonic-photonic modes in the structure and has potential applications in plasmonic biosensing.
Journal: Optics Communications - Volume 387, 15 March 2017, Pages 55-60