GearBits

Air Guitar

Six years ago, researchers from Cornell University built the world's smallest guitar to demonstrate the possibilities of using silicon fab techniques to manufacture micron-sized systems.

Now, Cornell has demonstrated a playable version of the red-blood-cell-sized guitar to show how such devices could be used as cheaper, more energy-efficient electronic circuit components.... by using a laser to strum the strings.

The new nanoguitar is 5 times larger than the original, but still only viewable with a microscope. Its strings are silicon bars, from 6-12 microns in length, and cross sections of 150 x 200 nanometers. The strings vibrate at 17 octaves higher than a real guitar.

You play the nanoguitar by focussing a laser beam on the strings. As the strings vibrate, they create interference patterns, which are detected and electronically converted to audible sound. The device plays simple tones and chords, with pitches determined by string length.

Practical applications? Of course.

Nanoscale objects vibrating at radio frequencies can substitute for quartz oscillators in electronic circuits, using less space and power. Since these vibrations can be tuned to a narrow range of frequencies, they are also usable in filter circuits. The unique light modulation system is also usable in fiber-optic communications systems to replace more expensive light sources.

All this, and the ability to play a wicked Santana...now that's my kind of science!