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Control of coherent information via on-chip photonic–phononic emitter–receivers
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Control of coherent information via on-chip photonic–phononic emitter–receivers
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Journal Article
Control of coherent information via on-chip photonic–phononic emitter–receivers
2015
Overview
Rapid progress in integrated photonics has fostered numerous chip-scale sensing, computing and signal processing technologies. However, many crucial filtering and signal delay operations are difficult to perform with all-optical devices. Unlike photons propagating at luminal speeds, GHz-acoustic phonons moving at slower velocities allow information to be stored, filtered and delayed over comparatively smaller length-scales with remarkable fidelity. Hence, controllable and efficient coupling between coherent photons and phonons enables new signal processing technologies that greatly enhance the performance and potential impact of integrated photonics. Here we demonstrate a mechanism for coherent information processing based on travelling-wave photon–phonon transduction, which achieves a phonon emit-and-receive process between distinct nanophotonic waveguides. Using this device, physics—which supports GHz frequencies—we create wavelength-insensitive radiofrequency photonic filters with frequency selectivity, narrow-linewidth and high power-handling in silicon. More generally, this emit-receive concept is the impetus for enabling new signal processing schemes.
Integrated photonics hold potential for signal processing but some operations are difficult to perform in all-optical devices. Here, Shin
et al
. use the coupling between coherent photons and phonons in nanophotonic waveguides to demonstrate frequency-selective, narrow-linewidth radiofrequency photonic filters.
Publisher
Nature Publishing Group UK,Nature Publishing Group,Nature Pub. Group
