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Journals and Conferences
Designing photonic devices using organic nonlinear dye/polymer composites requires an accurate determination of the index. A model of the wavelength and concentration dependence of the index that includes the density dependence is given.
A new class of hierarchically structured polymer optical materials possessing an internal refractive index gradient that mimics biological optical materials is described. The new materials permit the fabrication of gradient refractive index (GRIN) lenses with an unprecedented variety of index gradients. Gradients with different functional forms in both the… (More)
Several materials that have been demonstrated to have very large excited state NIR absorption coefficients have been examined by nanosecond Z-scan and nonlinear transmission experiments and demonstrate large decreases in transmission with increasing fluence.
Optical limiting in solid-core photonic crystal fibers filled with reverse-saturable absorbers has been observed. A sharp change in limiting threshold was found for materials in the fiber holes with refractive indices near n = 1.44.
We developed novel lenses from gradient index, multi-polymer sheets. The sheets were processed into lenses with spherically-symmetric index profiles. An F/2.25 GRIN singlet produced images with 4times better contrast than a commercial F/2.25 glass singlet.
Multimode capillary waveguide arrays containing reverse-saturable absorbers exhibit an enhancement of the nonlinear response. Experimental data are modeled by the effect of partial mode filling, influenced by fill fraction and capillary diameter.
A new naphthalocyanine was synthesized and incorporated into polycarbonate at high concentration. The thin film exhibits reverse saturable absorption from 520 nm to 725 nm and has an excited state lifetime greater than 5 ns.
The incorporation of a nonlinear dye into a nanolayered polymer structure has the ability to greatly enhance the nonlinear transmission of the dye. Several characteristics of the nanolayered structured were studied to optimize the effect.
Nanolayered polymer films were used to construct materials whose properties mimic bio-optic systems found in nature. The nanolayered structures have the unique ability to control the index gradient profile in three dimensions.
A new class of nanostructured polymer optical materials can mimic biological optical materials. Application to gradient refractive index (GRIN) lenses with an unprecedented variety of index gradients and a nonlinear 1-D photonic crystal are described.