Abstract
The resonant energy transfer enhancement from a plasmonic random laser (PRL) has been investigated by means of a dye-covered PVA film with embedded silver nanoplates (DC-PVA/AgNPs). Different sizes and morphologies of AgNPs were adopted to shift the localized surface plasmon resonance (LSPR) and intensify recurrent light scattering between the AgNPs. For better overlap between surface plasmon resonance and the photoluminescence of fluorescent molecules with appropriately-sized silver nanoprisms, the slope efficiency of the PRL was greatly enhanced and the lasing threshold was obviously reduced. In addition, the photon lifetime for the DC-PVA/AgNPs film reveals an apparent decline around 1.39 ns owing to better coupling with LSPR. The stronger light scattering of samples with bigger-sized silver nanoprisms has been demonstrated by coherent back scattering measurements, which reveals a smaller transport mean free path around 3.3 μm. With α-stable analysis, it has been successfully demonstrated that the tail exponent α can be regarded as an identifier of the threshold of random lasing.
Highlights
To-date, mirrorless random lasers (RLs),[1,2] with the characteristics of being compact and exible with a low lasing threshold, have been widely investigated for several decades
As we embed silver nanodisks into the PVA lm, a number of aperiodic emission spikes were excited on top of the broad emission spectrum as the pump energy increased above 21.5 mJ, Fig. 5(b)
It is attributed to recurrent light scattering between the AgNPs to form a number of closed-loops, termed the coherent feedback, which can be 7554 | RSC Adv., 2020, 10, 7551–7558
Summary
Localized surface plasmon resonance (LSPR), a spectacular physical effect, have attracted a great deal of attention to provide strong electromagnetic eld con nement or light trapping around the surface of nanostructures. Based on solution preparation strategies using chemical reduction,[35] the tremendous tailoring ability of the lateral size of AgNPs relative to their thickness can be achieved to shi the wavelength of LSPR This fact allows us to investigate the PRL characteristics of dye-covered PVA lms by embedding different sized AgNPs to alter the LSPR relative to the emission spectrum of the desired active medium. It is an indicator of the production of AgNPs with different sizes and morphologies.
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