We present the first ultra-enhancement of photonic nanojet in the multilayer microspheres. Using finite difference time domain simulation with high resolution, we have investigated the electric energy distribution in the vicinity outside a multilayer microsphere. The composite microsphere consists of a core and several concentric shells. The enhancement of photonic nanojet depends strongly on the thickness of metallic shells. It becomes attainable to stretch the nanojet greatly. The multilayer microspheres promise exciting avenues to nanoscale optical imaging and ultracompact electro-optical devices.
IEEE Nanotechnology Materials and Devices Conference