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(a) Micrograph showing packed microspheres and integrated fiber optic cables. (b) Silver nanoparticles (AgNPs) are trapped in the silica microsphere matrix. (c) Excitation and collection is performed by integrated fiber optic cables. (d) Experimental setup: the sample is loaded with a syringe pump. The fiber optic cables are connected to a diode laser and a Raman spectrometer.
