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Sea Creature Provides Inspiration for Better Lenses
Frosty Inc. writes "BBC News has a story about a sea creature that may provide the key to improving the quality of optical lenses. Scientists are speculating that the study of this creature might lead to more than better cameras. They believe that this knowledge could be applied to optical fiber networks as well, greatly improving their efficiency and speed."
Calcite lenses aren't new to sea creatures: nature came up with such devices in the Cambrian period (more than 500 million years ago) and installed them in trilobites. A typical problem with calcite is that it is exceptionally birefringent, so when a crystal is oriented such that you're not looking down the optic axis, the image seen through the crystal is doubled. Some trilobites apparently had excellent vision: trilobites would orient the calcite crystal so that they were looking down the optic axis in order to avoid doubled images, and would employ dual lenses to correct for spherical aberration. These days other sea creatures still use calcite lenses as well (not always nicely oriented lenses though).
I applaud nature for being so clever as to come up with advanced lenses roughly 500 million years before folks like Descartes figured out how to do the same thing, and I frequently stand in awe of what nature can accomplish. On the other hand, I'm often less impressed by newspaper reporting: why, for example, are the lenses on the critter in the article so revolutionary? What is so remarkable here? Why is this creature distinguished from all the other sea bugs that have calcite lenses in their eyes? Is it because there are more eyes? Do the lenses exploit some remarkable and previously unrecognized characteristic of calcite (very unlikely)?
Humanity will continue to mimic nature's innumerable innovations, but it's a lot easier for us to mimic and utilize them when we know what's special about them...