3D Digital Data-Storage Using Two-Photon Process: A Demonstration Task/ Novel Multifunctional Chromophores for Electro-Optic and Other Photonics Applications.

摘要

New opto-electronic and composite materials with enhanced photonic performance were developed and that applicators in 3D optical data-storage, 3D optical-circuitry, 3D micro-fabrications and photorefractivity were studied. Two-photo based technology was used to do photo-crosslinking at a precise volume location to produce complex 3D opticalcircuitry such a waveguide splitters and grating couplers as well as for fabricating MEMS. Another area of our activity bas been in preparation of photonic band gap materials for visible and near-IR range. Highly monodispersed silica and polystyrene spheres of varying diameter(1OO-8OOnm) were prepared and photonic crystals made from them showed photonic pseudogaps. We have successfully infiltrated the pores with a high refractive index conjugated polymer, PPV and etched out the silica spheres. The resulting inverterphotonic crystal exhibits enhanced reflectance at the band gap. Using a new approach of photosensitization with manocrystallites of inorganic semiconductors, we have prepared photorefractive composite for operation at l.31 micrometer and this approach can be extended for preparation of photorefractive materials with a tailored spectral response. Our new materials development in collaboration with Wright lab has made it possible to use two-photon approach to write information in different layers with the capacity of terabits/cm(3), which can flow be read by using a simple CW green laser. A three dimensional digital data-storage system based on two-photon process also was demonstrated. We have written layers of digital data in a dye doped polymer media (AF-240 from Air force Polymer branch doped in PMMA) using highly localized two-photon process. We have demonstrated a new data read back system using a 532nm solid state laser and were able to read the data using confocal single photon fluorescence detection.