Effective nonlinear optical properties of graded metal–dielectric composite films of anisotropic particles
نویسندگان
چکیده
We study the effective third-order nonlinear susceptibility of a graded metal–dielectric composite film of anisotropic particles with weak nonlinearity by invoking the local field effects within the Maxwell–Garnett theory. We further numerically demonstrate that the film can serve as a novel optical material to produce a broad structure in both the linear and the nonlinear response and an enhancement in the nonlinear response. © 2005 Optical Society of America OCIS codes: 160.4330, 310.6860, 160.4670, 160.4760.
منابع مشابه
Optical nonlinearity enhancement of graded metal-dielectric composite films
– We have derived the local electric field inside graded metal-dielectric composite films with weak nonlinearity analytically, which further yields the effective linear dielectric constant and third-order nonlinear susceptibility of the graded structures. As a result, the composition-dependent gradation can produce a broad resonant plasmon band in the optical region, resulting in a large enhanc...
متن کاملSecond-harmonic generation in graded metal–dielectric films of anisotropic particles
We investigate theoretically the effective second-harmonic generation (SHG) susceptibility in graded films of metal–dielectric random composites with anisotropically shaped particles by invoking the local field effects. Using numerical examples, we demonstrate that in the presence of gradation profiles and/or shape effects, graded metal–dielectric films could be used as novel optical materials ...
متن کاملGiant enhancement of optical nonlinearity in mixtures of graded particles with dielectric anisotropy
To investigate the effective linear dielectric constant e and third-order nonlinear susceptibility χe of composite media, in which graded inclusions with radial dielectric anisotropy are randomly embedded in a linear isotropic matrix, we develop an nonlinear anisotropic differential effective dipole approximation (NADEDA). Alternatively, based on a first-principles approach, the exact expressio...
متن کاملEffective nonlinear optical properties of composite media of graded spherical particles
We have developed a nonlinear differential effective dipole approximation ~NDEDA!, in an attempt to investigate the effective linear and third-order nonlinear susceptibility of composite media in which graded spherical inclusions with weak nonlinearity are randomly embedded in a linear host medium. Alternatively, based on a first-principles approach, we derived exactly the linear local field in...
متن کاملDielectric response of graded spherical particles of anisotropic materials
Anisotropic dielectric response occurs naturally due to the presence of gradation, like in functionally graded materials or graded biological cells. However, these materials with locally anisotropic dielectric responses can have macroscopically isotropic responses. In treating graded particles of anisotropic materials, traditional isotropic gradation methods need to be modified. In this work, w...
متن کامل