Active control of radiation beaming from Tamm nanostructures by optical microscopy

Abstract : Active control of the radiation orientation (beaming) of a metallic antenna has been reported by various methods, where the antenna excitation position was tuned with a typical 50 nm precision by a near-field tip or an electron-beam. Here we use optical microscopy to excite and analyze the fluorescence of a layer of nanocrystals embedded in an optical Tamm state nanostructure (metallic disk on top of a Bragg mirror). We show that the radiation pattern can be controlled by changing the excitation spot on the disk with only micrometer precision, in a manner which can be well described by numerical simulations. A simplified analytical model suggests that the propagation length of the in-plane confined optical modes is a key parameter for beaming control.
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Fu Feng, Clémentine Symonds, Catherine Schwob, Joel Bellessa, Agnès Maitre, et al.. Active control of radiation beaming from Tamm nanostructures by optical microscopy. New Journal of Physics, Institute of Physics: Open Access Journals, 2018, 20, pp.033020. ⟨10.1088/1367-2630/aaaf93⟩. ⟨hal-01768736⟩

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