Technical Comments

Comment on “Nonreciprocal Light Propagation in a Silicon Photonic Circuit”

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Science  06 Jan 2012:
Vol. 335, Issue 6064, pp. 38
DOI: 10.1126/science.1216682

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We show that the structure demonstrated by Feng et al. (Reports, 5 August 2011, p. 729) cannot enable optical isolation because it possesses a symmetric scattering matrix. Moreover, one cannot construct an optical isolator by incorporating this structure into any system as long as the system is linear and time-independent and is described by materials with a scalar dielectric function.

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