Enhanced Exiton-Plasmon Interaction Enabling Observation of Near-Field Photoluminescence in a WSe2-Gold Nanoparticle Hybrid SystemThu Jun 05 2025
Monolayer transition metal #dichalcogenides, such as tungsten diselenide, have recently attracted considerable attention due to their reduced dielectric screening and direct bandgap, which result in high exciton binding energy and strong #photoluminescence.*
The integration of monolayer transition metal dichalcogenides with #plasmonic #nanoparticles enhances their optoelectronic properties through localized surface #plasmons and strong electromagnetic confinement. *
In the article “Enhanced Exciton–Plasmon Interaction Enabling Observation of Near-Field Photoluminescence in a WSe2–Gold Nanoparticle Hybrid System” Anastasia Romashkina, Sandhya Sushil, Angela I. Barreda, Zlata Fedorova, Fatemeh Abtahi, Nathan Doolaard, Zifei Zhang, Christian Helgert, Isabelle Staude, Falk Eilenberger, Thomas Pertsch and Bayarjargal N. Tugchin investigated the photoluminescence response of the hybrid system of monolayer tungsten diselenide and gold nanoparticle arrays through #nearfieldmapping. *
Their study demonstrated a significant enhancement of the excitonic emission by the excited gold nanoparticles via near-field interaction. *
Anastasia Romashkina et al. examined the impact of exciton–plasmon-polariton coupling on the far-field response of the hybrid system. *
There, they observed the phenomenon of exciton-induced transparency, which indicates the intermediate coupling regime and helps resonantly enhance the light-matter interaction in monolayer tungsten diselenide.*
The second harmonic generation intensity from the hybrid system was shown to follow the linear spectral response of the hybrid system, thereby demonstrating the enhanced coupling between surface plasmons and excitons.
Anastasia Romashkina et al.’s research offers insights into the impact of intermediate coupling on the optical properties of hybrid exciton–plasmon systems, which is crucial for the development of advanced #nanophotonicdevices. *
The authors investigate the near-field optical response of the hybrid system with a #scatteringtypeNearfieldopticalMicroscope (#sSNOM), which allows for high-resolution imaging of the evanescent fields of a sample by analyzing the light scattered by the #AFMtip. Figure 2 in the cited article shows the scheme of the used setup. The s-SNOM is based on a tapping-mode #atomicforcemicroscope and uses a tip view #AFMprobe ( NANOSENSORS AdvancedTEC ATEC-NCAu https://www.nanosensors.com/advanced-tip-at-the-end-of-the…) that oscillates above the sample with an amplitude of about 40 nm and a frequency of Ω = 275 kHz. *
Please have a look at the NANOSENSORS blog for the full citation and a direct link to the full article.
