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We describe theoretically and observe experimentally the formation of asurface state in a semi-infnite waveguide array with side-coupled waveguide,designed to simultaneously achieve Fano and Fabry-Perot resonances. Wedemonstrate that the surface mode is compact, with all energy concentrated infew waveguides at the edge and no field penetration beyond the side-coupledwaveguide position. Furthermore, we show that by broadening the spectral bandin the rest of the waveguide array it is possible to suppress exponentiallylocalized modes, whereas the Fano state having the eigenvalue embedded in thecontinuum is preserved.

Compact surface Fano states embedded in the continuum of waveguide arrays