Radiation damping in the scattering of light by a metal sphere

Wang, Shou-Yih; Chu, Lan-Chan

doi:10.1016/0375-9601(86)90557-8

Cited by 1 publication

(2 citation statements)

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“…Unlike surface scattering, the magnitude of the radiation damping effect is proportional to the dimensions of nanoparticles. , Essentially, radiative damping becomes relevant when the particle radius is larger than 20 nm . (3) Dynamic depolarization is a more complex effect due to the interference between radiation emitted at different locations on the spheroid. , Unlike surface scattering and radiative damping, dynamic depolarization has a beneficial effect on field enhancement at smaller size and reduces field enhancement at larger size . The interplay of these three size-dependence damping effects should be considered in the electrodynamic model.…”

Section: Resultsmentioning

confidence: 99%

“…37 (3) Dynamic depolarization is a more complex effect due to the interference between radiation emitted at different locations on the spheroid. 38,39 Unlike surface scattering and radiative damping, dynamic depolarization has a beneficial effect on field enhancement at smaller size and reduces field enhancement at larger size. 35 The interplay of these three size-dependence damping effects should be considered in the electrodynamic model.…”

Section: Fundamental Understanding Into the Size Dependence Of Near-f...mentioning

confidence: 99%

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Nanoporous Silver Films for Surface-Enhanced Raman Scattering-Based Sensing

Yuan,

Zhang,

et al. 2024

ACS Appl. Nano Mater.

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Nanoporous metallic films have attracted great attention as surface-enhanced Raman scattering (SERS) substrates. The presence of nanosized protrusions in such nanoporous metallic films gives rise to remarkably improved SERS enhancement due to an additional lightning rod effect of protrusions. However, the positive contribution of protrusions was only preliminarily demonstrated by SERS measurements so far, and several important questions remain unaddressed�fundamental understanding into the near-field enhancement of protrusions, qualitative link between the measured SERS enhancement and properties of protrusions, and facile strategy for nanoporous metallic films with protrusions. In this paper, plasma oxidation−reduction of Ag nanofilms was used to fabricate various nanoporous Ag films with nanosized protrusions. The fundamental protrusion size dependence of near-field enhancement was elucidated from both the electrodynamic model and FDTD simulation, with the protrusion approximately treated as a hemiprolate spheroid positioned on a semi-infinite metallic base. With the as-fabricated nanoporous Ag films as the SERS substrates, the qualitative link between the measured SERS enhancement and density/size distribution of protrusions was established. The findings reported here contribute significantly to gaining deeper insight into the SERS enhancement of nanoporous metallic films and guiding future SERS substrate design.

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