Journal
OPTICS EXPRESS
Volume 19, Issue 27, Pages 26948-26955Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.19.026948
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Funding
- National Natural Science Foundation of China [10525419]
- State Key Development Program for Basic Research of China [2011CB922002]
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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 with wavelength-scale size 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. (C)2011 Optical Society of America
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