Molotoff, 2 suggestions - (1) can you put a DNA or some other molecule inside the circle, and (2) can you make it look like the straight line is a laser by making it look like it's hitting the circle and reflecting off a bit like this:
http://4.bp.blogspot.com/_RMGOM7zYeY4/SkNd0pWQ2SI/AAAAAAAACXo/q2VftBBEmKk/s400/laser_symbol_1.gif