The Lantern of the Photuris Firefly

THE lantern, or light organ, of a particular Photuris firefly is covered with jagged scales that dramatically enhance the brightness of the light that the insect produces.a

Consider: Researchers have found that tiny scales on the lantern surface of some fireflies form a corrugated pattern, somewhat like overlapping shingles or tiles. The scales tilt up at one end by just 3 micrometers​—less than one twentieth the thickness of a human hair. Yet this tiny tilt lets the lantern shine almost 50 percent more brightly than it would if the scales formed an even surface!

Could that concept improve the efficiency of light-emitting diodes (LEDs), which are used in electronic devices? To find out, scientists coated LEDs with a corrugated surface similar to that of the firefly’s lantern. The result? The LEDs emitted up to 55 percent more light! Physicist Annick Bay says: “The most important aspect of this work is that it shows how much we can learn by carefully observing nature.”

What do you think? Did the lantern of those Photuris fireflies come about by evolution? Or was it designed?