Contact: Chris Emery
Princeton University, Engineering School
Caption: This schematic shows the architecture of the sensor developed at Princeton. The chip is covered with structures that feature two key components: a cavity formed by metal on the top and at the base of each pillar; and metal particles of about 20 nanometers in diameter, known as plasmonic nanodots, on the pillar wall, with small gaps of about 2 nanometers between the metal components. The small particles and gaps significantly boost the Raman signal. The cavities serve as antennae, trapping light from the laser so it passes the plasmonic nanodots multiple times to generate the Raman signal rather than only once. The cavities also enhance the outgoing Raman signal.
Credit: Stephen Y. Chou
Usage Restrictions: Please credit Stephen Y. Chou
Related news release: Princeton engineers make breakthrough in ultra-sensitive sensor technology