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Rice nanophotonics experts create powerful molecular sensor
Date:7/15/2014

g CARS in conjunction with a light amplifier made of four tiny gold nanodiscs, Halas and Zhang were able to measure single molecules in a powerful new way. LANP has dubbed the new technique "surface-enhanced CARS," or SECARS.

"The two-coherent-laser setup in SECARS is important because the second laser provides further amplification," Zhang said. "In a conventional single-laser setup, photons go through two steps of absorption and re-emission, and the optical signatures are usually amplified around 100 million to 10 billion times. By adding a second laser that is coherent with the first one, the SECARS technique employs a more complex multiphoton process."

Zhang said the additional amplification gives SECARS the potential to address most unknown samples. That's an added advantage over current techniques for single-molecule sensing, which generally require a prior knowledge about a molecule's resonant frequency before it can be accurately measured.

Another key component of the SECARS process is the device's optical amplifier, which contains four tiny gold discs in a precise diamond-shaped arrangement. The gap in the center of the four discs is about 15 nanometers wide. Owing to an optical effect called a "Fano resonance," the optical signatures of molecules caught in that gap are dramatically amplified because of the efficient light harvesting and signal scattering properties of the four-disc structure.

Fano resonance requires a special geometric arrangement of the discs, and one of LANP's specialties is the design, production and analysis of Fano-resonant plasmonic structures like the four-disc "quadrumer." In previous LANP research, other geometric disc structures were used to create powerful optical processors.

Zhang said the quadrumer amplifiers are a key to SECARS, in part because they are created with standard e-beam lithographic techniques, which means they can be easily mass-produced.

"A 15-nanometer gap m
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Contact: David Ruth
david@rice.edu
713-348-6327
Rice University
Source:Eurekalert

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