Kelly J. Perry

Enhanced reverse saturable absorption and optical limiting in heavy-atom-substituted phthalocyanines.

The reverse saturable absorption and the optical-limiting response of metal phthalocyanines can be enhanced by use of the heavy-atom effect. Phthalocyanines containing heavy-metal atoms, such as In, Sn, and Pb, show a nearly factor-of-2 enhancement in the ratio of effective excited-state to ground-state absorption cross sections compared with those containing lighter atoms, such as Al and Si. In an f/8 optical geometry, homogeneous solutions of heavy-metal phthalocyanines, at 30% linear transmission, limit 8-ns 532-nm laser pulses to </=3 microJ (the energy for 50% probability of eye damage) for incident energies as high as 800 microJ.

New Organic And Organometallic Salts For Second-Order Nonlinear Optics

A series of organometallic and organic salts, in which the cation has been designed to have a large molecular hyperpolarizability, has been prepared. Variation of the counterion (anion) in many cases leads to materials with large powder second harmonic generation (SHG) efficiencies, the highest of which is roughly 2000 times that of a urea reference.

Conformal coating of tailored photonic crystals fabricated using multiphoton lithography

Titania sol-gel and silver electro-less deposition processes were utilized to apply conformal coatings to multiphoton lithographically fabricated polymer photonic crystal templates, resulting in enhanced refractive index and stop band reflectivity.

Fabrication of tailored photonic crystals using multiphoton lithography

Multiphoton lithography methods have been used to fabricate tailored photonic crystal structures with controllable stop bands that are effective templates for the formation of high contrast photonic crystals by post-fabrication processing. Metallization of such structures produces photonic crystals with a high reflectance in the infrared spectrum.

Advances in Two-Photon 3D Microfabrication

The development of two-photon materials for the fabrication of features with 80 nm resolution in 3D microfabrication and the fabrication of a range of photonic crystals with mid-IR stop bands will be discussed.