Controlling plasmon-exciton interactions through photothermal reshaping

Abstract

We investigated the plasmon-exciton interactions in an individual gold nanorod (GNR) with monolayer MoS 2 at room temperature with the single-particle spectroscopy technique. To control the plasmon-exciton interaction, we tuned the local surface plasmon resonance of an individual GNR in-situ by employing the photothermal reshaping effect. The scattering spectra of the GNR-MoS 2 hybrids exhibited two dips at the frequencies of the A and B excitons of monolayer MoS 2 , which were caused by the plasmon-induced resonance energy transfer effect. The resonance energy transfer rate increased when the surface plasmon resonance of the nanorod matched well with the exciton transition energy. Also, we demonstrated that the plasmon-enhanced fluorescence process dominated the photoluminescence of the GNR-MoS 2 hybrid. These results provide a flexible way to control the plasmon-exciton interaction in an all-solid-state operating system at room temperature.

Plasmon-enhanced nanosoldering of silver nanoparticles for high-conductive nanowires electrodes

“…Thus, a low density of light concentrates at the gaps between two adjacent Ag NPs, and these areas are referred to as "hot-spots " 23,36−44 . Interaction of light with Ag NPs is modeled using the previously reported method 36,37 , and the numerical calculations of plasmon-enhanced electric field are shown in Fig. 1(c).…”

Plasmon-enhanced nanosoldering of silver nanoparticles for high-conductive nanowires electrodes

“…Thus, the adjacent Ag NPs are in contact and welded together after the laser irradiation. This photothermal effect can be strongly enhanced when several NPs aggregate together [35][36][37][38][39][40][41][42][43], arising from surface plasmon resonance (SPR) of Ag NPs. Thus, a low density of light concentrates at the gaps between two adjacent Ag NPs, and these areas are referred to as "hot-spots" [23,[36][37][38][39][40][41][42][43].…”

“…This photothermal effect can be strongly enhanced when several NPs aggregate together [35][36][37][38][39][40][41][42][43], arising from surface plasmon resonance (SPR) of Ag NPs. Thus, a low density of light concentrates at the gaps between two adjacent Ag NPs, and these areas are referred to as "hot-spots" [23,[36][37][38][39][40][41][42][43]. Interaction of light with Ag NPs is modeled using the previously reported method [36,37], and the numerical calculations of plasmon-enhanced electric field are shown in Fig.…”

“…In our study, Ag NWs fabricated by FsLDW is composed of the aggregation of NPs. Laser nanosoldering for Ag NWs can be strongly enhanced because several NPs aggregate together form the "hot-spots" [36][37][38][39][40][41][42], as shown in Fig. 5(b).…”

“…The black areas (hot-spots) present the simulation results of the temperature distributions when the enhanced light field intensity increases 10 (d) and 300 (e) times by using FEM method.We have investigated the interaction between nanoparticles and light using commercially available finite element method (FEM) solver COMSOL Multiphysics. The surface plasmon resonances are usually dependent on the size, shape, and degree of particle-to-particle coupling[35][36][37][38][39][40][41][42]. The spatial distribution of Ag NPs is irregular and random but the particle's size meets the normal distribution in Fig.5(a).…”