Entity

Time filter

Source Type


Sullan R.M.A.,University of Toronto | Sullan R.M.A.,Catholic University of Louvain | Shi W.,University of Toronto | Chan H.,University of Toronto | And 4 more authors.
Soft Matter | Year: 2013

Polymeric additives affect the mechanics of phospholipid vesicles, but little is known about the effect to supported lipid bilayers that are phase segregated on the submicron length scale. In this study, we use AFM-based force mapping, by means of breakthrough forces, to quantify the spreading pressures and line tensions of raft-forming lipid bilayers consisting of dioleoylphosphatidylcholine (DOPC), egg sphingomyelin (ESM), and cholesterol (Chol) in the presence of diblock copolymers comprised of polystyrene (PS) and poly(ethylene oxide) (PEO), PS-b-PEO. Varying molecular weights of PS-b-PEO were used in the experiments. The presence of the polymer leads to higher breakthrough forces when compared to pure DOPC/ESM/Chol bilayers. The lipid-polymer composite made with a PS block radius of gyration comparable to the bilayer thickness and a PEO block length that is the shortest exhibits the highest breakthrough forces and hence is the most stable mechanically. The breakthrough force distributions are analyzed to extract the spreading pressures and line tensions of the lipid-polymer composites. The spreading pressure is seen to increase with the addition of PS-b-PEO, and on average, increases with decreasing PEO block length. Based on the results, we propose the incorporation of the PS moiety into the bilayer core as the main mechanism of this enhanced resistance to bilayer breakthrough by the AFM tip. © 2013 The Royal Society of Chemistry. Source


Mahler D.H.,Institute for Optical science | Mahler D.H.,University of Toronto | Rozema L.A.,Institute for Optical science | Rozema L.A.,University of Toronto | And 8 more authors.
Conference on Lasers and Electro-Optics Europe - Technical Digest | Year: 2014

We measure, using weak measurement, the Bohmian trajectories of one photon that is part of an entangled pair. Our results shed light on the nonlocality of the Bohm model, as well as its so-called "surrealism.". © 2014 Optical Society of America. Source


Mahler D.H.,Institute for Optical science | Mahler D.H.,University of Toronto | Rozema L.A.,Institute for Optical science | Rozema L.A.,University of Toronto | And 2 more authors.
2011 Conference on Lasers and Electro-Optics: Laser Science to Photonic Applications, CLEO 2011 | Year: 2011

Quantum process tomography (QPT) is a resource intensive task. We present an experiment in which a 3 dimensional decoherence free subspace is experimentally identified using 36 measurements, instead of the 256 measurements required for QPT. © 2011 OSA. Source


Mahler D.H.,Institute for Optical science | Mahler D.H.,University of Toronto | Bateman J.D.,Institute for Optical science | Bateman J.D.,University of Toronto | And 12 more authors.
Optics InfoBase Conference Papers | Year: 2013

We demonstrate optical super-resolution using a quantum centroid measurement of 2-photon N00N states, using a scalable 11-detector measurement scheme. We will also present the latest results from a 3-photon extension. © OSA 2013. Source


Mahler D.H.,Institute for Optical science | Mahler D.H.,University of Toronto | Rozema L.A.,Institute for Optical science | Rozema L.A.,University of Toronto | And 11 more authors.
Optics InfoBase Conference Papers | Year: 2012

We experimentally demonstrate two new quantum tomography protocols, one of which provides a quadratic speedup using adaptation and the other of which enables tomography to be done even with uncalibrated measurement devices. ©2011 Optical Society of America. Source

Discover hidden collaborations