Tunable directional emission from electrically-driven nanostrip tunnel junctions

Kishen, Saurabh and Tapar, Jinal and Emani, Naresh Kumar and et al, . (2022) Tunable directional emission from electrically-driven nanostrip tunnel junctions. In: Metamaterials XIII 2022, 9 May 2022 through 20 May 2022, Virtual, Online.

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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. © 2022 SPIE.

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IITH Creators:

IITH Creators	ORCiD
Emani, Naresh Kumar	https://orcid.org/0000-0002-0488-921X

Item Type:

Conference or Workshop Item (Paper)

Additional Information:

This work is supported by Science and Engineering Research Board (SERB), Govt. of India through ECR grant (ECR/2018/002452) and the Ramanujan fellowship (SB/S2/RJN-007/2017) and Ministry of Education (STARS/APR2019/NS/774).

Uncontrolled Keywords:

dynamic switching; inelastic electron tunneling; metal-insulator-metal tunnel junctions; reconfigurable emission; tunable directional emission

Subjects:

Electrical Engineering

Divisions:

Department of Electrical Engineering

Depositing User:

. LibTrainee 2021

Date Deposited:

18 Jul 2022 11:35

Last Modified:

18 Jul 2022 11:35