Design of hybrid 2D/quantum dot sensor materials for low-cost, uncooled mid-infrared sensing.

Uncooled mid-wave infrared (MWIR) image sensors, which are compact, lightweight, and energy-efficient, are expected to take a dominant position in the future infrared market. As an alternative to traditional epitaxially-grown infrared semiconductors used in high-performance cryo-cooled MWIR imagers, the concept of hybrid sensor materials is gaining attention. Specifically, hybrid structures combining two-dimensional (2D) materials, known for their superior carrier transport properties, with colloidal quantum dots (QDs), which offer excellent optical properties, have shown record-high room-temperature infrared responsivities with spectral responses extending to short-wave infrared (SWIR).

Note: Manipulation of supersonic atomic beams with static magnetic fields.

The inhomogeneous magnetic field of a permanent-magnet planar Halbach array is used to either deflect or to specularly reflect a supersonic beam of neutral atoms. Metastable neon and helium beams are tested to experimentally evaluate the performance of this array in a range of configurations. Results are compared with numerical simulations and the device is presented as a high precision tool for the manipulation of neutral atom beams.

Nanoscale imaging of neutral atoms with a pulsed magnetic lens.

We present a scheme for imaging of neutral atoms to the nanoscale with a pulsed magnetic lens and show its viability through numerical calculations. This scheme achieves focal lengths on the order of several centimeters and focal spots of less than 10 nm. With these results, it is possible to create sub-10 nm structures on surfaces in a parallel and time-efficient manner.