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Nanotechnology Based 3D Optical Imaging for Nondestructive Evaluation of Structural Integrity

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Fundacao de Apoio ao Desenvolvimento da UFPE RECIFE Brazil

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Core-shell nanostructures associated with photonics techniques have found innumerous applications in diagnostics and therapy. We introduce a novel core-shell nanostructure design that serves as a multimodal optical imaging contrast agent for dental adhesion evaluation. This nanostructure consists of a rare-earth doped NaYF4Yb 60,Tm0.5NaYF4 particle as the core hexagonal prism, approx. 51 nm base side length, and the highly refractive TiO2 material as the shell approx. thickness of 15 nm. We show that the TiO2 shell provides enhanced contrast for Optical Coherence Tomography OCT, while the rare-earth doped core upconverts excitation light from 975 nm to an emission peaked at 800 nm for photoluminescence imaging. The OCT and the photoluminescence wide-field images of human tooth were demonstrated with this nanoparticle core-shell contrast agent. In addition, the described coreshell nanoparticles were dispersed in the primer of a commercially available dental bonding system, allowing clear identification of dental adhesive layers with OCT. We evaluated that the presence of the core-shell nanoparticle in the adhesive induced an enhancement of 67 scattering coefficient to significantly increase the OCT contrast. Moreover, our results highlight that the up conversion photoluminescence in the near-infrared spectrum region is suitable for image of deep scattering medium.

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Technical Report,01 Sep 2012,31 Mar 2016



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Approved For Public Release;

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