Experimental Soft Condensed Matter Group Harvard University, Prof. D. A. Weitz Cool Picture of the Moment

We had a sample with undyed PMMA particles, and dye in the solvent. The sample had crystallized; by looking at a plane slightly between two crystal planes, we got this interesting moire-like pattern. See below for the same sample, focused on a crystal plane. The colors are artificial in both pictures. Picture provided by by Ian Wong & Tony Dinsmore, taken at our confocal microscope facility.

The particles in the picture below are 1.5 microns in diameter. This picture has inverted colors; the fluorescent stuff is the solvent (the stuff between the circles).

Past cool pictures...