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Opt. Soc. Amer. B 29, 818-826 (2012).

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Photon. 4, 382-387 (2010).

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gratings," Opt. Express 13, 3068-3078 (2005).

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using a grating-assisted coupler with asymmetric transmission," Opt. Express 13, 3567-3578 (2005).

J. Ctyroky, V. Kuzmiak, S. Eyderman, "Waveguide structures with antisymmetric
gain/loss profile," Opt. Express 18, 21585-21593 (2010).

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