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|Title:||Plasmonic focusing on metal and semiconductor disks under radially polarized terahertz illumination|
|Citation:||IRMMW-THz, 2013 38th International Conference on Infrared, Millimeter and Terahertz Waves, Mainz on the Rhine, 1-6 September, 2013: 3 p.|
|Conference Name:||International Conference on Infrared, Millimeter and Terahertz Waves (38th : 2013 : Mainz on the Rhine, Germany)|
|Abstract:||Optimal focusing of surface plasmon polaritons in the center of a metal disc illuminated by radially polarized terahertz pulses is demonstrated. Due to the cylinder symmetrical structure surface plasmons can be excited along the entire circumference, which interfere constructively in the center of the disk forming a sharp frequency-depended focal spot. We map the field distribution on the disk by THz near-field microscopy and compare our result to numerical simulations. For comparison, behavior under linearly polarized THz illumination is characterized. Furthermore, first results of semiconducting plasmonic lenses are presented.|
|Rights:||© 2013 IEEE|
|Appears in Collections:||Electrical and Electronic Engineering publications|
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