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We study giant Goos-H\"anchen (GH) shift in reflection from a near-symmetriccoupled waveguide structure. We show that broken spatial symmetry can lead toGH shift with different signs for illumination from the opposite ends, a directconsequence of the nonreciprocity relations considered earlier (Opt. Lett.27,1205 (2002)). Symmetry breaking by adding a few nm thick bio-layer to one ofthe guides is enough to observe the nonreciprocity. This may have far reachingimplications for efficient biosensing.

Nonreciprocity in giant Goos-H\"anchen shift due to symmetry breaking