Interfacial engineering of plasmonic nanoparticle metasurfaces

Abstract

Significance Molecules interacting with metallic nanostructures can show tunable exciton-plasmon coupling, ranging from weak to strong. One factor that influences the interactions is the spatial organization of the molecules relative to the localized plasmon-enhanced electromagnetic fields. In this work, we show that the arrangement of aromatic dye molecules can be tuned within plasmonic hotspots by interfacial engineering of nanoparticle surfaces. By controlling the local chemical and physical interactions, we could modulate lasing thresholds. Surface-functionalized plasmonic metasurfaces open prospects for programmable light-matter interactions at the nanoscale.

Plasmonic Nanostructure Lattices for High‐Performance Sensing

“…(d) and (e) Reproduced with permission. [125,298] Copyright 2020, NAS and Copyright 2022, NAS. biosensing and gas sensing.…”

“…Thermal annealing and chemical vapor deposition procedures have been developed to achieve ultranarrow SLRs with full width at halfmaxima linewidths toward the theoretical limit from arrays of Au, Ag, Al, and Cu NPs in a recent study (Figure 16d,e). [298,299] The potential of this annealing posttreatment method is expected to be further expanded with the development of cost-effective methods to generate a large-scale ordered pattern of plasmonic nanostructures. Nanoimprint, phase shift lithography, and projection reprinting may serve as good candidates to realize wafer-scale patterns of NPs with nanoscale precision.…”

“…Copyright 2021, Springer Nature. (d) and (e) Reproduced with permission [125,298]. Copyright 2020, NAS and Copyright 2022, NAS.…”

Zero‐Bias Long‐Wave Infrared Nanoantenna‐Mediated Graphene Photodetector for Polarimetric and Spectroscopic Sensing

“…[53][54][55][56][57][58][59] The metal plasmons can achieve extreme light confinement, strongly enhance the local electrical field by several orders and hence increase the absorption as well as the light-matter interactions. [60][61][62][63][64][65][66][67] Furthermore, the nanoantennas can serve as small metal electrodes to collect the carriers and thus give rise to the photocurrent. [68,69] Graphene-nanoantenna hybrid structures have been widely explored in sole graphene photodetectors or sensors, while only a few studies have been devoted to demonstrating surfaceenhanced sensing based on nanoantenna-mediated graphene photodetectors (NMGPDs).…”

Multipole Mie Resonances in MXene-Antenna Arrays

“…The electric and magnetic dipole and quadrupole moments of an antenna refer to the characteristics that describe the distribution and strength of its electric and magnetic fields, which play a significant role in determining the antenna’s radiation pattern and performance. Mie resonances are electromagnetic resonant responses that can occur in low-loss high-refractive-index or metallic nanoparticles and arise due to the interaction of light with the nanoparticle. − By incorporating metals and/or high-refractive-index materials into nanostructures, it is possible to achieve nanoscale light confinement and adaptable designs for controlling the optical field. ,− Plasmonic nanostructures take advantage of Mie resonances to efficiently manipulate light at the subwavelength scale.…”