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Raman scattering enhancement of silicon by photonic nanojet of a microsphere

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 – a narrow highly concentrated beam of light on the shadow side of the irradiated microsphere. The formation of the photonic nanojet is presented through Generalized Lorenz-Mie theory (GLMT), together with important properties and applications. Simulation images of the photonic nanojet are shown, both as solutions of GLMT equations, and numerical simulations. Furthermore, the photonic nanojet is presented as Raman scattering enhancement method different substrates (bulk, film on bulk, etc.) with microspheres and microspheres with a stem. The variation of the incident beam position is discussed, where raw enhancement reaches highest value (5.7x) for 0.50 NA objective, when the incident beam was focused 9 μm below the top of the 5-μm microsphere. Moreover, the combined dielectric enhancement with metallic surface-enhanced Raman scattering (SERS) is presented, together with future plans.

optical microsphere ; photonic nanojet ; Raman scattering ; GLMT ; SERS

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