Preview The New Tandon Website!

‘Tractor beam’ sensor could find cancer in blood

A new discovery could lead to Star Trek-like biosensor devices that could flag the barest presence of a specific virus, antibody, or protein marker for cancer in blood—or sniff out airborne chemical warfare agents while they’re still far below toxic levels. The discovery follows years of work by Stephen Arnold, professor of applied physics at New York University [Tandon School of Engineering], who in 1995 discovered that an optical fiber could excite what he termed Whispering Gallery Mode (WGM) in polymer micro-beads less than one-third the diameter of a human hair. … Now, Arnold and his team ...  are the first to find a way to determine the density of charges on an area of a WGM micro-bead’s surface, as well as the charge of an ensnared nanoparticle or virus, by measuring how light frequency fluctuates as the tiny particle follows its wobbly course around the sphere.

(see more)