On-chip optical diode based on silicon photonic crystal heterojunctions

Details On-chip optical diode based on silicon photonic crystal heterojunctions On-chip optical diode based on silicon photonic crystal heterojunctions

2011-10-26

arxiv.org/abs/1110.5761v1

Physics

Optics

14 pages, 5 figures

Scientific paper

Optical isolation is a long pursued object with fundamental difficulty in integrated photonics. As a step towards this goal, we demonstrate the design, fabrication, and characterization of on-chip wavelength-scale optical diodes that are made from the heterojunction between two different silicon two-dimensional square-lattice photonic crystal slabs with directional bandgap mismatch and different mode transitions. The measured transmission spectra show considerable unidirectional transmission behavior, in good agreement with numerical simulations. The experimental realization of on-chip optical diodes using all-dielectric, passive, and linear silicon photonic crystal structures may help to construct on-chip optical logical devices without nonlinearity or magnetism, and would open up a road towards photonic computers.

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