Volume 97, Issue 1, 01 January 2005
Index of content:
- LASERS, OPTICS, AND OPTOELECTRONICS
97(2005); http://dx.doi.org/10.1063/1.1827345View Description Hide Description
A rigorous analysis of pulse propagation in planar photonic crystal(PhC) coupled cavity waveguides (CCWs) of finite length is reported. Conventional PhCwaveguides, formed by a single line defect, are used at both interfaces of the CCW. An adiabatic taper based on progressively varying the radii of the spacing defects between cavities is used to achieve flat transmission bands with respect to the butt coupling case. The influence on the main parameters of the propagated pulse such as group delay, full width at half maximum and pulse attenuation are investigated for both the adiabatic and butt coupling cases. Furthermore, the Fabry-Perot formula has been used for modeling the pulse propagation along the CCW of finite length, which permits to analyze a large range of parameters avoiding the huge computation time requirements of finite-difference time-domain simulations.
97(2005); http://dx.doi.org/10.1063/1.1828610View Description Hide Description
The effective nondegenerate four-wave mixing (NDFM) susceptibility of graded metallic films with weak nonlinearity is exactly derived by invoking the local-field effects. It is found that the presence of gradation in metallic films can yield a broad resonantplasmon band in the optical region, which results in a large enhancement in the NDFM response and thus a large figure of merit.
Photoreactive phase conjugation strength in disperse red 1 doped poly(methylmethacrylate) thin films97(2005); http://dx.doi.org/10.1063/1.1829786View Description Hide Description
Near-resonant optical pumping was used to modulate third-order susceptibility in disperse red 1 doped poly(methylmethacrylate) thin films. An optically pumped degenerate four-wave mixing (DFWM) experiment was conducted to examine the photoreactive phase conjugation (PC) signals. Experimental results indicated a large anisotropy in PC signals arising from , and almost isotropic PC signals from under -polarized and -polarized pump fields. Additionally, a dynamic microscopic model, based on the theory developed by Sekkat et al.[Synth. Met.54, 373 (1993); J. Phys. Chem. B106, 12407 (2002); Opt. Commun.229, 291 (2004)] was presented to describe the observed optical nonlinear responses. Results from the model were generally consistent with those of the optically pumped DFWM experiment.