Visualizing plasmon coupling in closely-spaced chains of Ag nanoparticles by electron energy loss spectroscopy

Heat Transport Through Plasmonic Interactions in Closely Spaced Metallic Nanoparticles Chains

We report a numerical investigation on the heat transfer through one dimensional arrays of metallic nanoparticles closely spaced in a host material. Our simulations show that the multipolar interactions play a crucial role in the heat transport via collective plasmons. Calculations of the plasmonic thermal conductance and of the thermal conductivity in ballistic and diffusive regime, respectively have been carried out. (a) Using the Landauer-Buttiker formalism we have found that, when the host material dielectric constant takes positive values, the multipolar interactions drastically enhance b…

Visualizing plasmon-exciton polaritons at the nanoscale using electron microscopy

Polaritons are compositional light-matter quasiparticles that have recently enabled remarkable breakthroughs in quantum and nonlinear optics, as well as in material science. Despite the enormous progress, however, a direct nanometer-scale visualization of polaritons has remained an open challenge. Here, we demonstrate that plasmon-exciton polaritons, or plexcitons, generated by a hybrid system composed of an individual silver nanoparticle and a few-layer transition metal dichalcogenide can be spectroscopically mapped with nanometer spatial resolution using electron energy loss spectroscopy in …

通过石墨烯/转角-WSe₂结构中的等离激元与纳米光电流可视化莫尔铁电性

Visualizing moiré ferroelectricity via plasmons and nano-photocurrent in graphene/twisted-WSe2 structures

本研究利用近场红外纳米成像与纳米光电流技术，通过相邻石墨烯的等离激元响应可视化极小转角WSe₂的莫尔铁电畴，证实铁电极化对石墨烯等离激元及光电特性的调制作用，为莫尔铁电性研究及光电器件发展提供新路径。

二维超导体中的太赫兹超流体等离激元可视化

Visualizing a Terahertz Superfluid Plasmon in a Two-Dimensional Superconductor

该研究利用自旋电子太赫兹发射器近场，在少层Bi2Sr2CaCu2O8+x中观测并空间分辨了亚能隙二维超流体等离激元，揭示了二维超导转变的动量与频率依赖特性，为超流体现象研究提供了新平台。

Single Plasmon Switching with n Quantum Dots System Coupled to One-Dimentional Waveguide

Switching of a single plasmon interacting with equally spaced quantum dots coupled to one-dimensional surface plasmonic waveguide is investigated theoretically via the real-space approach. We showed that the transmission and reflection of a single plasmon can be switched on or off by dynamically tuning and changing the number of the equal transition frequencies of the quantum dots.

Fundamental Behavior of Electric Field Enhancements in the Gaps Between Closely Spaced Nanostructures

We demonstrate that the electric field enhancement that occurs in a gap between two closely spaced nanostructures, such as metallic nanoparticles, is the result of a transverse electromagnetic waveguide mode. We derive an explicit semianalytic equation for the enhancement as a function of gap size, which we show has a universal qualitative behavior in that it applies irrespective of the material or geometry of the nanostructures and even in the presence of surface plasmons. Examples of perfect electrically conducting and Ag thin-wire antennas and a dimer of Ag spheres are presented and discuss…