Tunable directional emission from electrically-driven nanostrip tunnel junctions

Saurabh Kishen; Jinal Tapar; Naresh Kumar Emani

doi:10.1117/12.2622183

24 May 2022 Tunable directional emission from electrically-driven nanostrip tunnel junctions

Saurabh Kishen, Jinal Tapar, Naresh Kumar Emani

Proceedings Volume 12130, Metamaterials XIII; 1213007 (2022) https://doi.org/10.1117/12.2622183
Event: SPIE Photonics Europe, 2022, Strasbourg, France

Abstract

Electrically driven sources of photons offer a unique platform for realising applications such as beam steering and free-space optical interconnects. Metal-insulator-metal (MIM) tunnel junctions have been extensively used to electrically generate and manipulate light via inelastic electron tunneling. However, beam steering by dynamically switching the excitation source is still not shown. Here, we numerically demonstrate tunable directional emission of light from electrically-driven nanostrip tunnel junctions. Our device consists of an Ag-SiO₂-Ag stack with the top Ag film milled into 16 nanostrips. Two nanostrips at the centre, labelled S₁ and S₂, act as individual sources with a resonance wavelength of ∼ 695 nm. We show that, by individually exciting S₁ or S₂, the light emission can be directed to spatially different channels, with an angle of emission depending on the periodicity of the passive elements. On applying a bias to source S₂, the calculated far-field radiation pattern showed a highly directional beam with an emission angle of 30° and FWHM of < 12°. When the source is switched to S₁, the emission pattern shifts to −30° with a similar FWHM, thereby paving the way towards practical, reconfigurable electrically-driven light sources.

Conference Presentation

Citation Download Citation

Saurabh Kishen, Jinal Tapar, and Naresh Kumar Emani "Tunable directional emission from electrically-driven nanostrip tunnel junctions", Proc. SPIE 12130, Metamaterials XIII, 1213007 (24 May 2022); https://doi.org/10.1117/12.2622183

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