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Nanophotonic_Frequency_Conversion_5

As shown in the schematic, in frequency downconversion, an input signal at 980 nm is frequency shifted to the 1550 nm wavelength band through the application of two strong pump lasers. The reverse process of upconversion (shifting an input signal from 1550 nm to 980 nm) was also demonstrated. Inset: Scanning electron micrograph of the cross-section of a silicon nitride waveguide designed for the frequency conversion with a simulation of the device’s optical field profile superimposed.

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