Polymer Multilayer Particles:A Route to Spherical Dielectric Resonators

摘要

Polymer multilayer particles with radial variation in refractive index can possess a photonic band gap and therefore can be used as spherical dielectric resonators (SDRs).We synthesized multilayer microspheres with morphology "predesigned" by modeling their scattering cross section.The particles had a polystyrene core and four 150 +- 20 nm thick alternating layers of polystyrene and poly(trifluoroethyl methacrylate) which were used as a high and a low refractive index counterpart,respectively.We confirmed the morphology of microspheres by transmission electron microscopy,energy dispersive X-ray analysis,and X-ray photoelectron spectroscopy.We undertook a further step in increasing refractive index contrast between the layers by copolymerizing styrene with vinylcarbazole.