2012
DOI: 10.1126/science.1216682
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Comment on “Nonreciprocal Light Propagation in a Silicon Photonic Circuit”

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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Cited by 126 publications
(94 citation statements)
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References 8 publications
(5 reference statements)
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“…[27][28][29] In addition, systems with less restricted symmetry properties that exhibit asymmetric transmission of light (both in a reciprocal and non-reciprocal manner) have gained considerable attention recently. [30][31][32] In the applications mentioned above, there is a strong trend toward highly integrated, tunable devices that demand dramatically downsized Faraday rotators. For the visible and standard telecommunication wavelengths in particular, the thickness of available Faraday rotators typically based on Bismuth-doped iron garnet (BIG) thick films 33 is on the order of centimeters.…”
Section: Introductionmentioning
confidence: 99%
“…[27][28][29] In addition, systems with less restricted symmetry properties that exhibit asymmetric transmission of light (both in a reciprocal and non-reciprocal manner) have gained considerable attention recently. [30][31][32] In the applications mentioned above, there is a strong trend toward highly integrated, tunable devices that demand dramatically downsized Faraday rotators. For the visible and standard telecommunication wavelengths in particular, the thickness of available Faraday rotators typically based on Bismuth-doped iron garnet (BIG) thick films 33 is on the order of centimeters.…”
Section: Introductionmentioning
confidence: 99%
“…(1) and (2), and is the reason for all the peculiarities displayed by PT-symmetric systems, while reciprocity always holds [11]. Keeping this basic principle in mind, we consider the PTsymmetric complex crystal in 2D space.…”
Section: Derivation Of the 2d Honeycomb Pt-symmetric Structurementioning
confidence: 99%
“…Therefore, by a proper design of the geometrical parameters and by an appropriately chosen operating wavelength, the asymmetric transport behavior of the grooved wire can be explored for a selected mode. Nevertheless, the asymmetric transport behavior should be not confused with one-way optical elements such as optical isolators [30][31][32] and it should be kept in mind that the presented system is reciprocal. So the transport behavior for the mode with m = 1 would be the opposite (propagation for k z > 0 and suppression for k z < 0).…”
Section: -2mentioning
confidence: 99%