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Anisotropic molecular alignment occurs ubiquitously and often heterogeneously at different size scales. However, conventional optical imaging approaches can only provide incomplete molecular orientation maps on the 2D polarization plane. Here, we present two new approaches based on polarization-controlled IR microscopy and broadband CARS microscopy to determine the 3D angles of molecular orientations independently at each image pixel. These new approaches are based on concurrent polarization analysis of multiple vibrational modes to map the 3D orientation angles and the order parameter of the local orientational distribution of polymer chains. We demonstrate the new technique using a non-banded poly(e-caprolactone) film and a ring-banded polyethylene film.
Young J. Lee andShuyu Xu
"QuantitativeiImaging of 3D orientation of polymer chains (Conference Presentation)", Proc. SPIE PC12385, Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XXX, PC1238507 (15 March 2023); https://doi.org/10.1117/12.2649319
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Young J. Lee, Shuyu Xu, "QuantitativeiImaging of 3D orientation of polymer chains (Conference Presentation)," Proc. SPIE PC12385, Three-Dimensional and Multidimensional Microscopy: Image Acquisition and Processing XXX, PC1238507 (15 March 2023); https://doi.org/10.1117/12.2649319