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Photonic Nanojet of a Microsphere for Raman Scattering Enhancement

A new method for enhancing the Raman scattering signal has emerged recently, based on dielectric enhancement. Especially promising is the dielectric method based on microspheres and photonic nanojet. The formation of the photonic nanojet is presented through Generalized Lorenz- Mie theory (GLMT) of light scattering from a microsphere, together with important properties and parameters for formation. Simulation images of the photonic nanojet are shown with the help of homemade GLMT computer program and numerical simulations from other research. Experimental vertical Raman mappings of a 5-µm microsphere on top of a silicon substrate are presented. Enhancement value on maps was the highest (5.7x) for 0.50 NA objective, when the incident beam was focused 9 µm below the top of the sphere. Furthermore, dielectric enhancement can be combined with surface enhanced Raman scattering (SERS), where other research is shown together with future plans.

optical microsphere ; photonic nanojet ; Raman scattering ; Generalized Lorenz-Mie theory

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