| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 1684596 | Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms | 2006 | 4 Pages |
Linear and nonlinear optical properties of Au and Cu nanoparticle composites, fabricated by ion implantation, were studied with evaluation of applicability to all-optical switching device. Negative ions of 60 keV were implanted into amorphous SiO2 at fluxes of about 10 μA/cm2 to a fluence of 1 × 1017 ions/cm2. The surface plasmon resonance of the Au:SiO2 composite was enhanced stronger than that of the Cu:SiO2 composite because of a difference of the local field in nanoparticles. Nonlinear optical constants were evaluated by the Z-scan method with a tunable femtosecond laser system. The nonlinear absorption coefficients exhibited maximal values of −4.9 × 101 m/GW for Cu:SiO2 and −1.3 × 102 m/GW for Au:SiO2 around the surface plasmon resonance. For application of the composites to optical switching by optical bistability, it was estimated that the reflectivity of resonators is >0.94 for the Au:SiO2 composite and that the switching energy was approximately 10 pJ/bit.
