Plasmonic Horizon in Gold Nanosponges.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 29337572.
- Also identified by DOI 10.1021/acs.nanolett.7b04875.
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Abstract
An electromagnetic wave impinging on a gold nanosponge coherently excites many electromagnetic hot-spots inside the nanosponge, yielding a polarization-dependent scattering spectrum. In contrast, a hole, recombining with an electron, can locally excite plasmonic hot-spots only within a horizon given by the lifetime of localized plasmons and the speed carrying the information that a plasmon has been created. This horizon is about 57 nm, decreasing with increasing size of the nanosponge. Consequently, photoluminescence from large gold nanosponges appears unpolarized.