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Comment on "Nonreciprocal light propagation in a silicon photonic circuit" |
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| Authors: | Fan Shanhui Baets Roel Petrov Alexander Yu Zongfu Joannopoulos John D Freude Wolfgang Melloni Andrea Popović Miloš Vanwolleghem Mathias Jalas Dirk Eich Manfred Krause Michael Renner Hagen Brinkmeyer Ernst Doerr Christopher R |
| Institution: | Ginzton Laboratory, Department of Electrical Engineering, Stanford University, Stanford, CA 94305, USA. shanhui@stanford.edu |
| Abstract: | 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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