Abstract
The conduction electrons of metallic nanoparticles (NPs) exhibit collective oscillations named localized surface plasmon (LSP) that needs to be well understood aiming at various photonic applications [1]. In particular the study of the dephasing relaxation time, T2, of the LSP is important because the local electromagnetic field enhancement in the vicinity of the NPs is proportional to T2, which depends on the metal element, size and shape of the NPs, chemical enviroment, and the frequency of the excitation radiation [2]. For colloidal NPs it is expected a dependence of T2 on the stabilizing agents of the colloid but this effect is often underlooked because T2 ≤ 10 fs being difficult to measure using time-resolved techniques [3]. Besides this, the chemical synthesis methods commonly used produce NPs with different sizes and shapes, giving rise to inhomogeneously broadened optical extinction profiles. Several frequency-resolved techniques have been proposed to measure T2 [4] but no systematic study is available concerning the effect of the NPs’ capping agents.
© 2011 Optical Society of America
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