Localized Plasmon Field Effect of Gold Clusters Embedded in Nanoporous Silicon

Coupling between nanoplasmonics and semiconducting materials can enhance complement the efficiency of almost all semiconductor technologies. It has been demonstrated that such composites light coupling to nanowires, increase photocurrent in detectors, enable sub-gap detection, allow DNA produce large non-linearity. Nevertheless, tailored fabrication using conventional methods remains a formidable challenge. This work attempts resolve deficiency by deploying immersion-plating method spontaneously grown gold clusters inside nano-porous silicon (np-Si). allows thin films np-Si with embedded nanoparticles (Au) creates nanoplasmonic–semiconductor composites, np-Si/Au, fractional volume 0.02 0.13 metallic component. Optical scattering measurements reveal distinctive, 200 nm broad, localized surface plasmon (LSP) resonance, centered around 700 nm. Linear non-linear properties, their time evolution are investigated optically pumping LSP resonance probing optical response short wavelength infra-red (2.5 μm) light. The ultrafast time-resolved study demonstrates unambiguously is not only directly related excitation, but strongly enhanced respect bare np-Si, while its strength be tuned varying