Gold nanoparticles have been widely used during the past few years in various technical and biomedical applications. In particular,\r\nthe resonance optical properties of nanometer-sized particles have been employed to design biochips and biosensors used as\r\nanalytical tools. The optical properties of nonfunctionalized gold nanoparticles and core-gold nanoshells play a crucial role for\r\nthe design of biosensors where gold surface is used as a sensing component. Gold nanoparticles exhibit excellent optical tunability\r\nat visible and near-infrared frequencies leading to sharp peaks in their spectral extinction. In this paper, we study how the optical\r\nproperties of gold nanoparticles and core-gold nanoshells are changed as a function of different sizes, shapes, composition, and\r\nbiomolecular coating with characteristic shifts towards the near-infrared region.We show that the optical tenability can be carefully\r\ntailored for particle sizes falling in the range 100ââ?¬â??150 nm. The results should improve the design of sensors working at the detection\r\nlimit.
Loading....