Effects of Near- and Far-Field Coupling on the Enhancement Factor of the Radiative Decay Rate of Multiple Emitters Near a Silver Nanoparticle Sphere

Abstract

Using the coupled dipole method, we examined the enhancement factor of the radiative decay rate of one or multiple emitters when they are placed near a silver nanoparticle with a 10 nm radius. The simulation results indicate that the induced dipole of the central nanoparticle plays a key role in the enhancement factor of the radiative decay rate of emitters. The results between one emitter and the central nanoparticle are consistent with the previous studies. The near-field coupling among multiple emitters is important and will determine the magnitude and phase of the induced dipole of the central nanoparticle. When the magnitude of the induced dipole is much larger than those of the emitting dipoles, a high enhancement factor will be obtained, and the phase of the induced dipole is less important. When the magnitude of the induced dipole is comparable to those of emitting dipoles, the relative phase between the induced dipole and those of emitting dipoles will lead to both far-field constructive and destructive interference and result in complex profiles in the enhancement factor spectra.

Effects of Cascading Optical Processes: Part II: Impacts on Experimental Quantification of Sample Absorption and Scattering Properties

“…For convenience, we refer to the samples containing both KMnO 4 and PSNP as PSNP/KMnO 4 solutions. Since those samples are used for probing the interplay between the sample absorptions and scattering, it is important to exclude the possibility of significant physiochemical interactions between KMnO 4 and PSNP to ensure the reliability of the spectral interpretation. − …”

Nanophotonics for Chemical Imaging and Spectroscopy

“…The above-echoed goal of characterizing increasingly complex interfaces comprises a recurrent theme in modern SERS-based spectroscopy and imaging studies. This VSI therefore includes a variety of SERS studies covering a broad range of fundamental and applied studies. − From work aimed at better understanding the unique optical properties of a single rod on a mirror to the ultrasensitive detection of plant biomarkers and herbicides, and through 3D SERS imaging of nanoporous gold–silver microstructures, the scope of SERS work in this issue is appropriately and exquisitely diverse. An interesting contribution that analyzed SERS hotspot dynamics in dry and aqueous environments is worth singling out .…”