Sahara world

This Sahara landscape with mysterious signs was formed by slow evaporation of a low-concentration ZnO-nanorods solution on a vertical fixed SiO2 substrate. The image with real dimensions of 2.87 mm × 1.04 mm was captured by an optical microscope in bright field mode.

Stefan Thiemann, Friedrich-Alexander-Universität Erlangen-Nürnberg, Germany

figure 1

August 2012 answer key

figure 2

Radiation burst

This nanoscale antenna array radiation pattern simulation shows a detail of grating lobes from a MATLAB model of the possible radiation pattern from a driven square array of carbon nanotubes.

Tim P. Butler, Cambridge University, UK

figure 3

Answers will be in the February 2013 issue.