Nonlinear optical properties of As2Se3 thin films

We propose As2Se3 thin film, which has large third nonlinear optical properties, as one of the candidates for super-resolution near-field structure (super-RENS) materials in the optical recording disks. As2Se3 thin film was deposited by thermal evaporation technique and surface roughness, linear/nonlinear optical properties were characterized. As2Se3 thin film shows large nonlinear optical characteristics (chi((3))(R)=7.42 x 10(-7) m(2)/W, gamma = 1.268 x 10(-5) m(2)/W) and self-focusing phenomenon. Super-resolution effect was measured by a laser beam profiler. As a result, recording density can be enhanced by 2.3 times in case when 300 and 350 nm As2Se3 thin films are applied as a superRENS. (c) 2005 Elsevier B.V. All rights reserved.