AI Article Synopsis
- The study explores how both radiative and non-radiative damping affect the lifetime of localized surface plasmon resonance (LSPR) modes in gold nanorods.
- It finds that the lifetime of the LSPR mode varies with the nanorod's length, exhibiting different behaviors between super-radiant and sub-radiant modes.
- Surprisingly, the super-radiant mode can have a lifetime comparable to or longer than the sub-radiant mode, challenging previous assumptions and suggesting practical applications in nano-lasers and sensitive molecular spectroscopy.
Article Abstract
Revealing the coaction effect of radiative and non-radiative damping on the lifetime of the localized surface plasmon resonance (LSPR) mode is a prerequisite for the applications of LSPR. Here, we systematically investigated the coaction effect of radiative and non-radiative damping on the lifetime of the super-radiant and sub-radiant LSPR modes of gold nanorods using time-resolved photoemission electron microscopy (TR-PEEM). The results show that the lifetime of the LSPR mode depends on the length of the gold nanorod, and the different variation behavior of an LSPR mode lifetime exists between the super-radiative mode and the sub-radiative one with the increase of nanorod length (volume). Surprisingly, it is found that the lifetime of the super-radiant LSPR mode can be comparable to or even longer than that of the sub-radiant LSPR mode, instead of the usual claim that a sub-radiant LSPR mode has a longer life than the super-radiant mode. Those TR-PEEM experimental results are supported by finite-difference time-domain simulations and are well explained by the coaction effect with the calculation of the radiative and non-radiative damping rate with the increase of the nanorod volume. We believe that this study is beneficial to build a low-threshold nano-laser and ultrasensitive molecular spectroscopy system.
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| http://dx.doi.org/10.1063/5.0134709 | DOI Listing |
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