Report

An All-Silicon Passive Optical Diode

Science  22 Dec 2011:

DOI: 10.1126/science.1214383

Abstract

A passive optical diode effect would be useful for on-chip optical information processing, but has been difficult to achieve. Based on optical nonlinearity, we demonstrate a forward-backward transmission ratio up to 28 dB within telecommunication wavelengths using two 5-micrometer radius silicon rings. Our device is passive, yet maintains optical nonreciprocity for a broad range of input power levels and performs equally well even if the backward input power is higher than the forward input. The silicon optical diode is ultra compact and is compatible with current complementary metal-oxide-semiconductor (CMOS) processing.

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