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We experimentally verified the phenomena of photonic jets generated byplane-electromagnetic-wave-illuminated dielectric micro-cylinders with diametercomparable to the corresponding wavelength at microwave frequencies. Using ahome-made 2D spatial field mapping system, we carried out a point-by-pointmeasurement of both phase and intensity of spatial electric field distributioninside and around scattering cylinders, providing a clear completeelectromagnetic field picture for these phenomena. Correspondingly, thetheoretically predicted super-enhancement of the backscattering induced bysmall particles of deeply-subwavelength size located within the photonic jetswas also confirmed. Our measurements agreed well with the numericalsimulations, indicating that the photonic jets indeed can provide a promisingpowerful way for deeply subwavelength detection and imaging.

Direct Observation of Photonic Jets and Corresponding Backscattering Enhancement at Microwave frequencies