Quantum laser nanoantenna demonstrated
U.S. engineers have created a quantum cascade laser nanoantenna for producing ultrahigh-resolution microscopes for chemical imaging in biology and medicine.
Harvard University researchers said their laser is capable of resolving the chemical composition of samples, such as the interior of a cell, with unprecedented detail.
The researchers -- who have filed for U.S. patents covering the new class of photonic devices -- said the laser’s design consists of two gold rods separated by a nanometer gap -- a device known as an optical antenna -- built on the facet of a quantum cascade laser. Such a laser emits invisible light in the region of the spectrum where most molecules leave their telltale absorption fingerprints.
The nanoantenna creates a light spot of nanometric size about 50 to 100 times smaller than the laser wavelength. That allows the spot to be scanned across a specimen to provide chemical images of the surface with superior spatial resolution.
The researchers -- led by graduate students Nanfang Yu, Ertugrul Cubukcu and physics Professor Federico Capasso -- report the findings in the journal Applied Physics Letters. // Copyright 2007 by United Press International
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