Three-Dimensional Metal Dielectric Photonic CrystalBased on Self-Assembled Gold Nanoshells

摘要

Recently developed metal nanoshells are ideal building blocks for metal-dielectric photonic crystals operating in visibleand near-infrared spectrum. We applied silica coating to screen the van der Waals force and also added a dispersant toincrease the electrostatic repulsive force. We also stabilized the gold nanoshell sterically by using a surfactant. With theuse of tetrasodium pyrophosphate as a dispersant and Tween as a surfactant, we successfully obtained highly stablecolloidal solution of gold nanoshells and subsequently self-assembled them into highly ordered opal structures. Weobserved well-defined diffraction pattern in the fast Fourier Transform spectra and optical spectra that match well thetheoretical photonic band structure.