Fabrication and optical characterization of multi-encoded rugate porous silicon/polymer composite.

Multi-encoded rugate porous silicon (MRPS)/polystyrene composite films were fabricated by using a free-standing multi-encoded rugate PS and polystyrene. MRPS exhibiting three reflection resonances was generated by an electrochemical etching of silicon wafer using a composite waveform summed three computer-generated pseudo-sinusoidal current waveforms, which were corresponded to the each of the sine components varied from 0.40, 0.

Synthesis and optical characterization of silicon nanoparticles.

Various reaction conditions, such as quantity of reducing agent and reaction time were investigated with the aim of finding a simple, optimized synthetic route for the synthesis of luminescent silicon nanoparticles (SiNPs). Si NPs were synthesized from the reaction of ethylenediammonium chloride and magnesium silicide via a low temperature solution route. Optical characterizations of silicon nanoparticles were achieved by using ultraviolet-visible (UV-Vis) and photoluminescence (PL) spectroscopy.

Adsorption and desorption characteristics of gradient distributed Bragg reflector porous silicon layers.

Adsorption and desorption characteristics of gradient distributed Bragg reflector (DBR) porous silicon (PSi) were investigated under the exposure of organic vapors. Gradient DBR PSi whose average pore size decreased as the lateral distance from the Pt electrode increased was generated by using an asymmetric etching configuration. The reflection resonances were measured as a function of lateral distance from a point closest to the plate Pt electrode to a position on the silicon surface.

Chemical sensor based on porous silicon dual transducers.

Novel porous Si exhibiting dual optical properties, both Fabry-Perot fringe (optical reflectivity) and photoluminescence, were developed and used as chemical sensors. Porous Si samples were prepared by an electrochemical etch of p-type silicon under the illumination with a 300 W tungsten filament bulb for the duration of etch. The surface of porous Si was characterized by FT-IR instrument.