Optical properties of silver nanocrystal synthesized by a new srategies: Experiments supported by DDA calculation

In order to understand surface plasmon resonance of metal nanocrystals, we have produced sphere silver nanocrystals (AgNCs) by liquid-solid-solution (LSS) method. The synthesized AgNCs have high extinction coefficient and narrow size distribution. This provides a convenience for studying optical surface plasmon resonance (SPR) properties of AgNCs. Based on these excellent properties, we calculate the extinction spectrum of AgNCs, electrical field distribution near the AgNCs by discrete dipole approximation (DDA) method and investigate the effect of size, incident wavelength and material on electrical field distribution. These results could be helpful for us to simulate optical properties of real metal NCs more accurately, study optical properties of AgNCs periodic structure and engineer AgNCs with new plasmonic properties.