1 Experimental Methods: a) Materials: Cadmium oxide (CdO) powder, Zinc oxide (ZnO), Trioctylphosphine (T OP ), Selenium powder, Sulphur, Oleic acid (OA), ODE, Chloroform and Toluene, were obtained from Sigma-Aldrich (Germany) for the synthesis of QDs. Dodecanethiol (DDT ), HAuCl 4 , N aBH 4 granules, N aOH, Hexene also procured from Sigma-Aldrich and Acetone,hexane, HCL from HDFCL for AuNP synthesis. Deionized water (18.2 Megaohms-cm, Milipore) was used for all Langmuir-Blodgett (LB) film transfer. b) Synthesis and characterization of Quantum Dot: The CdSe-ZnS core-shell quantum dots are prepared traditional hot-injection synthesis of CdSe cores followed by slow growth of a ZnS shell from solution. CdO and ZnO are mixed and dissolved in OA and ODE and the mixture is heated up to 310 deg C to get clear solution and then inject required amount of TOP-S and TOP-Se stock solution in the three neck flux containing hot Cadmium based growth solution. After injection, we maintain a constant temperature of 300 deg C for desired amount of time to get proper size of QD. This quantum dot has Cadmium selenide (CdSe) spherical core and it is covered by Zinc-Selenide (ZnS) shell. By keeping the temperature constant at 300 degree for 10 min, the formed QD has diameter around 6.7 nm and Photoluminescence emission at wavelength 570 nm. c)Synthesis and characterization of Gold Nano Praticle: Gold nanoparticles (AuNP) are made in water by borohydride reduction and phase-transferred to hexane. This dodecanethiolate-protected gold nanoparticles synthesis is a fast process and does not require a cleaning step. The stock solution of 50 mM gold chloride was made by dissolving HAuCl 4 − 3H 2 O with the same molar concentration of HCl in a glass vial and the aqueous stock solution of 50 mM borohydride was made by dissolving N aBH 4 granules with the same molar amount of N aOH. Now 100 µL of the AuCl 4 solution added with water and later injected 300 µL of the borohydride solution to that while stirring the mixture on a mechanical shaker for uniform * murugesh@iisc.ac.in † basu@iisc.ac.in
It is known that the more tractable Markovian models of coupling suited for weak interactions may overestimate the Rabi frequency notably when applied to the strong-coupling regime. Here, a more significant consequence of the non-Markovian interaction between a photon emitter and dissipating matter such as resonant plasmonic nanoparticles is described. A large increase of radiative decay and a diminished non-radiative loss is shown, which unravels the origin of unexpected large enhancements of surface-enhanced-Raman-spectroscopy (SERS), as well as the anomalous enhancements of emission due to extremely small fully absorbing metal nanoparticles less than 10 nm in dimensions. We construct the mixture of pure states of the coupled emitter-nanoparticle system, unlike conventional methods that rely on the orthogonal modes of the nanoparticle alone.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.