SILICON NANOPARTICLE MICROCRYSTAL NONLINEAR OPTICAL DEVICES

摘要

Harmonic incident radiation is obtained from a silicon nanoparticle microcrystal (10) or microcrystal film. The silicon nanoparticle microcrysta ls are formed from silicon nanoparticles of about 1 nm and having about 1 part per thousand or less larger than 1 nm. The preferred film comprises silicon nanoparticles, dimensioned on the order of one nanometer, reconstituted into a device quality crystalline film. The microcrystal film emits the second harmonic of incident radiation for excitation in the range of about 600 - 1000nm. A preferred device according to the invention includes a silicon nanoparticle microcrystal film formed on a substrate, such as silicon or glass. Crystals of the silicon nanoparticles, due to the harmonic response, also demonstrate the capability to serve as piezoelectric material and as an improved biological marker. Since the emission response of the silicon nanoparticle crystals will be influenced by surrounding electric fields, the microcrystals also provides for electrochromatic mapping of electric field distribution in general and in electronic devices.