Now showing items 1-20 of 52

    • Absence of red structural color in photonic glasses, bird feathers, and certain beetles 

      Magkiriadou, Sofia; Park, Jin-Gyu; Kim, Young-Seok; Manoharan, Vinothan N. (American Physical Society (APS), 2014)
      Colloidal glasses, bird feathers, and beetle scales can all show structural colors arising from short-ranged spatial correlations between scattering centers. Unlike the structural colors arising from Bragg diffraction in ...
    • Breaking trade-offs between translucency and diffusion in particle-doped films 

      Benjamin Rogers, W.; Corbett, Madeleine Clare; Magkiriadou, Sofia; Guarillof, Philippe; Manoharan, Vinothan N. (Optical Society of America (OSA), 2014)
      Particle-doped thin films that are translucent and diffusive have applications in cosmetics, coatings, and display technologies, but finding material combinations that produce these effects simultaneously is challenging: ...
    • Charged hydrophobic colloids at an oil–aqueous phase interface 

      Kelleher, Colm P.; Wang, Anna; Guerrero-García, Guillermo Iván; Hollingsworth, Andrew D.; Guerra, Rodrigo; Krishnatreya, Bhaskar Jyoti; Grier, David G.; Manoharan, Vinothan N.; Chaikin, Paul M. (American Physical Society (APS), 2015)
      Hydrophobic poly(methyl methacrylate) (PMMA) colloidal particles, when dispersed in oil with a relatively high dielectric constant, can become highly charged. In the presence of an interface with a conducting aqueous phase, ...
    • Colloidal matter: Packing, geometry, and entropy 

      Manoharan, Vinothan N. (American Association for the Advancement of Science (AAAS), 2015)
      Colloidal particles with well-controlled shapes and interactions are an ideal experimental system for exploring how matter organizes itself. Like atoms and molecules, these particles form bulk phases such as liquids and ...
    • Colloids at interfaces: Pinned down 

      Manoharan, Vinothan N. (Springer Nature, 2015)
      A colloidal particle straddling an air/water interface experiences an unexpectedly large viscous drag.
    • Colloids with valence and specific directional bonding 

      Wang, Yufeng; Wang, Yubao; Breed, Dana R.; Manoharan, Vinothan N.; Feng, Lang; Hollingsworth, Andrew D.; Weck, Marcus; Pine, David J. (Nature Publishing Group, 2012)
      The ability to design and assemble three-dimensional structures from colloidal particles is limited by the absence of specific directional bonds. As a result, complex or low-coordination structures, common in atomic and ...
    • Core–shell colloidal particles with dynamically tunable scattering properties 

      Meng, Guangnan; Manoharan, Vinothan N.; Perro, Adeline (Royal Society of Chemistry (RSC), 2017)
      We design polystyrene–poly(N′-isopropylacrylamide-co-acrylic acid) core–shell particles that exhibit dynamically tunable scattering. We show that under normal solvent conditions the shell is nearly index-matched to pure ...
    • Crystal-Liquid Transitions Studied With Colloids in an Electric Bottle 

      Hwang, Hyerim (2016-05-18)
      In this thesis, we have presented the experimental investigations on the crystal-liquid transitions in a colloidal system. Colloids behave as big atoms, thus they are good model systems to study the dynamics of condensed ...
    • Deriving Finite Sphere Packings 

      Arkus, Natalie; Manoharan, Vinothan N.; Brenner, Michael P. (Society for Industrial and Applied Mathematics, 2011)
      Sphere packing problems have a rich history in both mathematics and physics; yet, relatively few analytical analyses of sphere packings exist, and answers to seemingly simple questions are unknown. Here, we present an ...
    • Disordered packings of core-shell particles with angle-independent structural colors 

      Magkiriadou, Sofia; Park, Jin-Gyu; Kim, Young-Seok; Manoharan, Vinothan N. (The Optical Society, 2012)
      Making materials that display angle-independent structural color requires control over both scattering and short-range correlations in the refractive index. We demonstrate a simple way to make such materials by packing ...
    • Elastic Instability of a Crystal Growing on a Curved Surface 

      Meng, Guangnan; Paulose, Jayson Joseph; Nelson, David R.; Manoharan, Vinothan N. (American Association for the Advancement of Science, 2014)
      Although the effects of kinetics on crystal growth are well understood, the role of substrate curvature is not yet established. We studied rigid, two-dimensional colloidal crystals growing on spherical droplets to understand ...
    • Epistasis and Pleiotropy in Evolving Populations 

      Jerison, Elizabeth (2016-07-25)
      In the era of high-throughput genome sequencing, it has become possible to measure the genetic changes that drive evolution. These direct observations enable us to test both qualitative and quantitative hypotheses about ...
    • Fano-like Interference in Self-Assembled Plasmonic Quadrumer Clusters 

      Fan, Jonathan A.; Bao, Kui; Wu, Chihhui; Bao, Jiming; Bardhan, Rizia; Halas, Naomi J.; Manoharan, Vinothan N.; Shvets, Gennady; Nordlander, Peter; Capasso, Federico (American Chemical Society (ACS), 2010)
      Assemblies of strongly interacting metallic nanoparticles are the basis for plasmonic nanostructure engineering. We demonstrate that clusters of four identical spherical particles self-assembled into a close-packed asymmetric ...
    • Fast, Label-Free Tracking of Single Viruses and Weakly Scattering Nanoparticles in a Nanofluidic Optical Fiber 

      Faez, Sanli; Lahini, Yoav; Weidlich, Stefan; Garmann, Rees F.; Wondraczek, Katrin; Zeisberger, Matthias; Schmidt, Markus A.; Orrit, Michel; Manoharan, Vinothan N. (American Chemical Society (ACS), 2015)
      High-speed tracking of single particles is a gateway to understanding physical, chemical, and biological processes at the nanoscale. It is also a major experimental challenge, particularly for small, nanometer-scale ...
    • The Free-Energy Landscape of Clusters of Attractive Hard Spheres 

      Meng, Guangnan; Arkus, Natalie; Brenner, Michael P.; Manoharan, Vinothan N. (American Association for the Advancement of Science, 2010)
      The study of clusters has provided the most tangible link between local geometry and bulk condensed matter. But experiments have not yet systematically explored the thermodynamics of even the smallest clusters. Here we ...
    • Full-Spectrum Photonic Pigments with Non-iridescent Structural Colors through Colloidal Assembly 

      Park, Jin-Gyu; Kim, Shin-Hyun; Magkiriadou, Sofia; Choi, Tae Min; Kim, Young-Seok; Manoharan, Vinothan N. (Wiley-Blackwell, 2014)
      Structurally colored materials could potentially replace dyes and pigments in many applications, but it is challenging to fabricate structural colors that mimic the appearance of absorbing pigments. We demonstrate the ...
    • Generalization of the optical theorem for light scattering from a particle at a planar interface 

      Small, Alex; Fung, Jerome; Manoharan, Vinothan N. (The Optical Society, 2013)
      The optical theorem provides a powerful tool for calculating the extinction cross section of a particle from a solution to Maxwell’s equations, relating the cross section to the scattering amplitude in the forward direction. ...
    • Glycans pattern the phase behaviour of lipid membranes 

      Subramaniam, Anand; Guidotti, Guido; Manoharan, Vinothan N.; Stone, Howard (Springer Nature, 2012)
      Hydrated networks of glycans (polysaccharides)—in the form of cell walls, periplasms or gel-like matrices—are ubiquitously present adjacent to cellular plasma membranes. Yet, despite their abundance, the function of glycans ...
    • Holographic Measurements of Anisotropic Three-Dimensional Diffusion of Colloidal Clusters 

      Fung, Jerome; Manoharan, Vinothan N. (American Physical Society, 2013)
      We measure all nonzero elements of the three-dimensional diffusion tensor D for clusters of colloidal spheres to a precision of 1% or better using digital holographic microscopy. We study both dimers and triangular trimers ...
    • Holographic Microscopy for Soft Matter and Biophysics 

      Dimiduk, Thomas G. (2016-09-14)
      I discuss a series of advancements I have made towards making digital holographic microscopy into a useful tool for experimental scientists in soft-matter physics and biophysics. Digital holograms can be recorded with ...