Polarization-Independent Plasmon-Exciton Strong Coupling in a Transition-Metal Dichalcogenide-Plasmonic Heterodimer Sandwich

Suri, P and Vashist, E and Sai, TP and Ghosh, A (2024) Polarization-Independent Plasmon-Exciton Strong Coupling in a Transition-Metal Dichalcogenide-Plasmonic Heterodimer Sandwich. In: ACS Applied Optical Materials, 2 . pp. 1573-1579.

	PDF acs_app_opt_mat_2_8_2024.pdf - Published Version Restricted to Registered users only Download (4MB) | Request a copy
	PDF acs_app_opt_mat_2_8_2024.pdf - Published Supplemental Material Restricted to Registered users only Download (539kB) | Request a copy

Abstract

Optical excitons in transition-metal dichalcogenide monolayers, when combined with plasmonic nanocavities, are excellent platforms for achieving the plasmon-exciton strong coupling regime at room temperature. Previous reports show strategies where either multiple layers of WSe2 are used or the optical response shows strong polarization dependence. Here, we investigate a precisely positioned array of vertically integrated plasmonic nanocavities with monolayer WSe2 sandwiched between them, similar to a nanoparticle-on-mirror geometry but with crucial design differences. We utilize optical retardation across isolated heterodimers to achieve record-high field enhancement within a 10-50 nm3 mode volume, thus showing polarization-insensitive plasmon-exciton strong coupling with an experimentally measured Rabi splitting greater than 170 meV. The large Rabi splitting and the polarization insensitivity at nonzero angles of incidence are further confirmed by numerical simulations. The strongly coupled WSe2-heterodimers are electrically disconnected and thus suitable for optoelectronic device applications, in addition to possible applicability in plexciton-based nanodevices such as low-threshold lasers. © 2024 American Chemical Society.

Item Type:	Journal Article
Publication:	ACS Applied Optical Materials
Publisher:	American Chemical Society
Additional Information:	The copyright for this article belongs to publisher.
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering Division of Physical & Mathematical Sciences > Physics
Date Deposited:	08 Oct 2024 07:09
Last Modified:	08 Oct 2024 07:09
URI:	http://eprints.iisc.ac.in/id/eprint/86408

Actions (login required)

View Item