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Amplified Photon Upconversion by Photonic Shell of Cholesteric Liquid Crystals
Kang, Ji-Hwan,Kim, Shin-Hyun,Fernandez-Nieves, Alberto,Reichmanis, Elsa American Chemical Society 2017 JOURNAL OF THE AMERICAN CHEMICAL SOCIETY - Vol.139 No.16
<P>As an effective platform to exploit triplet triplet-annihilation-based photon upconversion (TTA-UC), microcapsules composed of a fluidic UC core and photonic shell are microfluidically prepared using a triple emulsion as the template. The photonic shell consists of cholesteric liquid crystals (CLCs) with a periodic helical structure, exhibiting a photonic band gap. Combined with planar anchoring at the boundaries, the shell serves as a resonance cavity for TTA-UC emission and enables spectral tuning of the UC under low-power-density excitation. The CLC shell can be stabilized by introducing a polymerizable mesogen in the LC host. Because of the microcapsule spherical symmetry, spontaneous emission of the delayed fluorescence is omnidirectionally amplified at the edge of the stop band. These results demonstrate the range of opportunities provided by TTA-UC systems for the future design of low-threshold photonic devices.</P>
The CONTIN algorithm and its application to determine the size distribution of microgel suspensions
Scotti, A.,Liu, W.,Hyatt, J. S.,Herman, E. S.,Choi, H. S.,Kim, J. W.,Lyon, L. A.,Gasser, U.,Fernandez-Nieves, A. American Institute of Physics 2015 The Journal of chemical physics Vol.142 No.23
<P>We review a powerful regularization method, known as CONTIN, for obtaining the size distribution of colloidal suspensions from dynamic light scattering data. We show that together with the so-called L-curve criterion for selecting the optimal regularization parameter, the method correctly describes the average size and size distribution of microgel suspensions independently characterized using small-angle neutron scattering. In contrast, we find that when using the default regularization process, where the regularizer is selected via the 'probability to reject' method, the results are not as satisfactory.</P>