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Ultralow power all-optical diode in photonic crystal heterostructures with broken spatial inversion symmetry

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7 Author(s)
Lu, Cuicui ; State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, People''s Republic of China ; Xiaoyong Hu ; Zhang, Yingbo ; Li, Zhiqiang
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We experimentally realize an all-optical diode in a photonic crystal heterostructure with broken spatial inversion symmetry. The physical mechanism is attributed to bandgaps only for certain wavevectors and the transition between different electromagnetic Bloch modes, without any nonlinearity and high power requirement. An ultralow photon intensity of 50 kW/cm2 and an ultrahigh transmission contrast of over 103 are reached simultaneously. Compared with previous reported all-optical diodes, the operating power is reduced by seven orders of magnitude, while the transmission contrast is enlarged by two orders of magnitude. This approach may open a way for the study of integrated photonic devices.

Published in:

Applied Physics Letters  (Volume:99 ,  Issue: 5 )

Date of Publication:

Aug 2011

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