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Publication Citation: Three dimensional optical manipulation and structural imaging of soft materials by use of laser tweezers and multimodal nonlinear microscopy

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Author(s): Rahul P. Trivedi; Kristine A. Bertness; Ivan I. Smalyukh;
Title: Three dimensional optical manipulation and structural imaging of soft materials by use of laser tweezers and multimodal nonlinear microscopy
Published: December 15, 2010
Abstract: We develop an integrated system of holographic optical trapping and multimodal nonlinear microscopy and perform simultaneous three-dimensional optical manipulation and non-invasive structural imaging of composite soft-matter systems. We combine different nonlinear microscopy techniques such as coherent anti-Stokes Raman scattering, multi-photon excitation fluorescence and multi-harmonic generation, and use them for visualization of long-range molecular order in soft materials by means of their polarized excitation and detection. The combined system enables us to accomplish manipulation in composite soft materials such as colloidal inclusions in liquid crystals as well as imaging of each separate constituents of the composite material in different nonlinear optical modalities. We also demonstrate optical generation and control of topological defects and simultaneous reconstruction of their three- dimensional long-range molecular orientational patterns from the nonlinear optical images.
Citation: Optics Express
Volume: 18
Issue: 26
Pages: pp. 27658 - 27669
Keywords: laser trapping; multiphoton processes; nanowires; optical tweezers; optical nonlinearity
Research Areas: Nondestructive, Materials Science, Measurements
DOI: http://dx.doi.org/10.1364/OE.18.027658  (Note: May link to a non-U.S. Government webpage)
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