Micro ring resonator has highest quality factor to date

phys.org | 6/2/2016 | Staff
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Researchers at MIT and Singapore University of Technology (SUTD) have demonstrated a micro ring resonator made of amorphous silicon carbide with the highest quality factor to date. The resonator shows promise to be used as an on-chip photonic light source at the infrared telecom wavelength of 1,550 nanometers.

Ordinary daylight will pass through a window unaltered, in a process called linear transmission, but the same light passing through a prism will split into a rainbow of colors. Similarly in photonic devices, infrared light from a laser can pass through in linear fashion without changing its "color," but at high intensity, the light can exhibit nonlinear behavior, generating additional colors, or wavelengths. For example, a single yellow laser coupled to a photonic device can generate blue, green, yellow, or orange colors.

Researchers - MIT - Materials - Research - Laboratory

Researchers led by MIT Materials Research Laboratory Research Scientist Anuradha M. Agarwal fabricated the amorphous silicon carbide ring resonators, and researchers at SUTD led by Associate Professor Dawn T.H. Tan analyzed the device's linear and nonlinear properties.

"We are able to show one order of magnitude higher nonlinear effect than measured before in any of the silicon carbide substrates," Agarwal says.

Quality - Factor - Measure - Resonator - Effects

Quality factor is a measure of how strongly the resonator produces nonlinear effects. "The larger the quality factor, the better the nonlinear effect," says Tan, who leads the Photonics Devices and Systems Group at SUTD. "So in this case, the quality factor was pretty good. It was actually much better than we expected."

The findings are described in a paper, featured on the cover of ACS Photonics, by Agarwal, Tan, MIT materials science and engineering graduate student Danhao Ma, and three others in Singapore and Malaysia.

Intensity - Light - Properties - Devices - Power

High intensity of light is needed to trigger nonlinear properties for photonic devices, which can be achieved either by ramping up the power of the laser or using a...
(Excerpt) Read more at: phys.org
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