Surface scattering contribution to the plasmon width in embedded Ag nanospheres

Abstract

Abstract:Nanometer-sized metal particles exhibit broadening of the localized surface plasmon resonance (LSPR) in comparison to its value predicted by the classical Mie theory. Using our model for the LSPR dependence on non-local surface screening and size quantization, we quantitatively relate the observed plasmon width to the nanoparticle radius R and the permittivity of the surrounding medium ε m . For Ag nanospheres larger than 8 nm only the non-local dynamical effects occurring at the surface are important and, up to a diameter of 25 nm, dominate over the bulk scattering mechanism. Qualitatively, the LSPR width is inversely proportional to the particle size and has a nonmonotonic dependence on the permittivity of the host medium, exhibiting for Ag a maximum at ε m ≈ 2.5. Our calculated LSPR width is compared with recent experimental data.

Probing nanoparticle substrate interactions with synchrotron infrared nanospectroscopy: Coupling gold nanorod Fabry-Pérot resonances with SiO2 and h−BN phonons

“…Since the scattered field contains both radiative and nonradiative components, the selection rules for s-SNOM are relaxed compared to far-field plane-wave illumination, as the actual collected signal in s-SNOM is the radiation from the coupled tip-sample region. Direct measurement of a nanoparticle's dielectric response using such techniques provides (1) a window into resonant energy transfer between nanostructured materials with their supporting substrates, (2) a method for analyzing irregularities of thin-film structures, and (3) an avenue for exploring quantum-size and surface-scattering effects [41][42][43][44]. Additionally, because the tip's characteristic length scale is on the order of tens of nanometers, near-field effects allow s-SNOM to overcome Abbe's diffraction limit [45].…”

Role of Size-Dependent Damping Due to Electron–Surface Scattering on the Al Nanoparticle-Based Deep Ultraviolet Surface-Enhanced Fluorescence

“…It is important to note that for estimating the LEFE and 𝛾 𝑆𝐸𝐹 of the nanoparticles, one should know the wavelengths of the plasmon modes. One can easily obtain these wavelengths either from absorption or scattering spectra of single nanoparticles [35][36][37]. Since, the lower and higher order modes are relatively prominent in absorption spectra rather than the scattering spectra [38], in the present study, we have plotted the absorption spectra (absorption efficiency versus wavelength plots) of single Al nanoparticles of different sizes using the analytical expression given in Ref.…”

“…It is crucial to note that in small nanoparticles, the plasmon damping due to the electron-surface scattering is predominant [40][41][42]. Therefore, the 𝜀(𝜔) becomes size-dependent.…”

Complementary high performance sensing of gases and liquids using silver nanotube

“…These studies were focused on the electronic contributions to the polarizabilities or dielectric functions of MNPs at the reduced dimensions. Near the lower end of that size region, the quantum size effect (QSE) was studied in relation with induced energy gap which scales with inverse particle size [13][14][15][16]. Closer to the upper end, the effect of dynamical surface screening or the generally so-called nonlocal surface effect becomes more dominant and has been related to the d-electron spill-out or spill-in effects [16][17][18][19][20][21].…”

“…Near the lower end of that size region, the quantum size effect (QSE) was studied in relation with induced energy gap which scales with inverse particle size [13][14][15][16]. Closer to the upper end, the effect of dynamical surface screening or the generally so-called nonlocal surface effect becomes more dominant and has been related to the d-electron spill-out or spill-in effects [16][17][18][19][20][21]. The QSE effect generally induces plasmon energy blue shifts.…”