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Symphony of nanoplasmonic and optical resonators produces laser-like light emission
Date:8/26/2014

rformance of the chips."

At the heart of the amplifier is a microsphere (made of polystyrene or glass) that is approximately 10 microns in diameter. When activated by an intense beam of light, the sphere generates internally a narrowband optical signal that is produced by a process known as Raman scattering. Molecules tethered to the surface of the sphere by a protein amplify the Raman signal, and in concert with a nano-structured surface in contact to the sphere, the amplifier produces visible (red or green) light having a bandwidth that matches the internally-generated signal.

The proposed design is well-suited for routing narrowband optical power on-a-chip. Over the past five decades, optical oscillators and amplifiers have typically been based on the buildup of the field from the spontaneous emission background. Doing so limits the temporal coherence of the output, lengthens the time required for the optical field to grow from the noise, and often is responsible for complex, multiline spectra.

"In our design, we use Raman assisted injection-seeded locking to overcome the above problems. In addition to the spectral control afforded by injection-locking, the effective Q of the amplifier can be specified by the bandwidth of the injected Raman signal," Gartia said. This characteristic contrasts with previous WGM-based lasers and amplifiers for which the Q is determined solely by the WGM resonator.


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Contact: Gary Eden
jgeden@illinois.edu
217-333-4157
University of Illinois College of Engineering
Source:Eurekalert  

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