The role of incident electromagnetic field enhancement and photon density of states enhancement with respect to spontaneous scattering (Raman and Rayleigh processes) and spontaneous emission of photons is discussed. Field enhancement and density of states effects do manifest themselves in the same manner both in photoluminescence and scattering processes. Differences in scattering and luminescence enhancement are due to quenching processes which are less pronounced for scattering but crucial for luminescence because of finite internal relaxation processes between excitation and emission events. We consider recent experimental results on photoluminescence enhancement of organic molecules and quantum dots with polyelectrolyte spacers of the order of 10 nm to provide optimal balance of enhancement and quenching factors. A model of the so-called “hot point” in surface enhanced Raman spectroscopy is elaborated in terms of simultaneous incident field and density of states enhancements and high Q-factors at excitation and scattered frequencies.


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    Title :

    Ultrasensitive Laser Analysis of Nanostructures: Theoretical Background and Experimental Performance


    Contributors:


    Publication date :

    2010-01-01


    Size :

    14 pages





    Type of media :

    Article/Chapter (Book)


    Type of material :

    Electronic Resource


    Language :

    English





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