Stark Effect Control of the Scattering Properties of Plasmonic Nanogaps Containing an Organic Semiconductor

Pagnotto, Donatello; Muravitskaya, Alina; Benoit, David M; Bouillard, Jean-Sebastien G; Adawi, Ali M

Abstract

The development of actively tunable plas-monic nanostructures enables real-time reconfigurable and on demand enhancement of optical signals. This is an essential requirement for a wide range of applications such as sensing and nanophotonic devices, for which electrically driven tunability is required. By modifying the transition energies of a material via the application of an electric field, the Stark effect offers a reliable and practical approach to achieve such tunability. In this work, we report on the use of the Stark effect to control the scattering response of a plasmonic nanogap formed between a silver nanoparticle and an extended silver film separated by a thin layer of the organic semiconductor PQT-12. The plasmonic response of such nano-scattering sources follows the quadratic stark shift. Additionally, our approach allows to experimentally determine the polarizability of the semiconductor material embedded in the nanogap region, offering a new approach to probe the excitonic properties of extremely thin semi-conducting materials such as 2D materials under applied external electric field with nanoscale resolution.

Citation

Pagnotto, D., Muravitskaya, A., Benoit, D. M., Bouillard, J. G., & Adawi, A. M. (2023). Stark Effect Control of the Scattering Properties of Plasmonic Nanogaps Containing an Organic Semiconductor. ACS Applied Optical Materials, 1(1), 500–506. https://doi.org/10.1021/acsaom.2c00135

• Journal Article Type: Article
• Acceptance Date: Dec 5, 2022
• Online Publication Date: Dec 20, 2022
• Publication Date: 2023-01
• Deposit Date: Dec 15, 2022
• Publicly Available Date: Dec 21, 2022
• Journal: ACS Applied Optical Materials
• Publisher: American Chemical Society
• Peer Reviewed: Peer Reviewed
• Volume: 1
• Issue: 1
• Pages: 500–506
• DOI: https://doi.org/10.1021/acsaom.2c00135
• Keywords: Stark Effect; Plasmonic Nano-gap; Organic Semiconductor; FDTD; Molecular Polarizability; DFPT
• Public URL: https://hull-repository.worktribe.com/output/4154891