Electrodynamic Interference and Induced Polarization in Nanoparticle-Based Optical Matter Arrays.

Optical matter (OM) arrays are self-organizing, ordered arrangements of nanometer- to micrometer-size particles, where interparticle forces are mediated by incident and scattered coherent light. The structures that form and their dynamics depend on the properties (e.g.

Data-driven reaction coordinate discovery in overdamped and non-conservative systems: application to optical matter structural isomerization.

Optical matter (OM) systems consist of (nano-)particle constituents in solution that can self-organize into ordered arrays that are bound by electrodynamic interactions. They also manifest non-conservative forces, and the motions of the nano-particles are overdamped; i.e.

Controlling the Dynamics and Optical Binding of Nanoparticle Homodimers with Transverse Phase Gradients.

While transverse phase gradients enable studies of driven nonequilibrium phenomena in optical trapping, the behavior of electrodynamically interacting particles in a transverse phase gradient has not been explored in detail. In this Letter we study electrodynamically interacting pairs of identical nanoparticles (homodimers) in transverse phase gradients. We establish that the net driving force on homodimers is modulated by a separation-dependent interference effect for small phase gradients.

Crossover from positive to negative optical torque in mesoscale optical matter.

The photons in circularly polarized light can transfer their quantized spin angular momentum to micro- and nanostructures via absorption and scattering. This normally exerts positive torque on the objects wher the sign (i.e.

Direct Visualization of Barrier Crossing Dynamics in a Driven Optical Matter System.

A major impediment to a more complete understanding of barrier crossing and other single-molecule processes is the inability to directly visualize the trajectories and dynamics of atoms and molecules in reactions. Rather, the kinetics are inferred from ensemble measurements or the position of a transducer ( e. g.

MobileODT: a case study of a novel approach to an mHealth-based model of sustainable impact.

A persistent challenge facing global health actors is ensuring that time-bound interventions are ultimately adopted and integrated into local health systems for long term health system strengthening and capacity building. This level of sustainability is rarely achieved with current models of global health intervention that rely on continuous injection of resources or persistent external presence on the ground. Presented here is a case study of a flipped approach to creating capacity and adoption through an engagement strategy centered around an innovative mHealth device and connected service.

Real-Time Monitoring and Evaluation of a Visual-Based Cervical Cancer Screening Program Using a Decision Support Job Aid.

In many developing nations, cervical cancer screening is done by visual inspection with acetic acid (VIA). Monitoring and evaluation (M&E) of such screening programs is challenging. An enhanced visual assessment (EVA) system was developed to augment VIA procedures in low-resource settings.

Improving prevention of mother-to-child transmission of HIV care and related services in eastern Rwanda.

Younsook Lim and colleagues describe the Rwanda Learning Collaborative on Child Health, which aimed to improve and extend the impact of prevention of mother-to-child transmission of HIV/AIDS.

No shelter from the storm: reclaiming the right to housing and protecting the health of vulnerable communities in post-Katrina New Orleans.

This article explores human rights- and health-related aspects of the rebuilding process in New Orleans, Louisiana, USA, following the August 2005 assault of Hurricane Katrina. We look at the health and social impacts of post-Katrina redevelopment policies on New Orleans'poor Black communities. We describe systematic violations of poor Black residents' human right to housing, and we explore associations between these rights violations and documented negative trends in community health.