19 April 2016 Using a plasmonic lens to control the emission of electrically excited light
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Abstract
A local, low-energy, electrical method for the excitation of localized and propagating surface plasmon polaritons (SPPs) is attractive for both fundamental and applied research. In particular, such a method produces no excitation background light and may be integrated with nanoelectronics. Here we report on the electrical excitation of SPPs through the inelastic tunneling of low-energy electrons from the tip of a scanning tunneling microscope (STM) to the surface of a two-dimensional plasmonic lens. The plasmonic structure is a series of concentric circular slits etched in a thick gold film on a glass substrate. An out-going circular SPP wave is generated from the tip-sample junction and is scattered into light by the slits. We compare the resulting emission pattern to that observed when exciting SPPs on a thin, unstructured gold film. For optimized parameters, the light emitted from the plasmonic lens is radially polarized. We describe the effects of the slit period and number, and lens diameter on the emission pattern and we diskuss how the light beam of low divergence is formed.
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Shuiyan Cao, Shuiyan Cao, Médéric Lequeux, Médéric Lequeux, Eric Le Moal, Eric Le Moal, Aurélien Drezet, Aurélien Drezet, Serge Huant, Serge Huant, Gérald Dujardin, Gérald Dujardin, Elizabeth Boer-Duchemin, Elizabeth Boer-Duchemin, } "Using a plasmonic lens to control the emission of electrically excited light", Proc. SPIE 9884, Nanophotonics VI, 98841Y (19 April 2016); doi: 10.1117/12.2224472; https://doi.org/10.1117/12.2224472
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