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We present new results from the widest narrow band survey search forLyman-alpha (Lya) emitters at z=5.7, just after reionization. We survey a totalof 7 deg$^2$ spread over the COSMOS, UDS and SA22 fields. We find over 11,000line emitters, out of which 514 are robust Lya candidates at z=5.7 within avolume of 6.3x10$^6$ Mpc$^3$. Our Lya emitters span a wide range in Lyaluminosities, from faint to bright (L$_{\rm Ly\alpha}\sim10^{42.5-44}$ ergs$^{-1}$) and rest-frame equivalent widths (EW$_0$~25-1000 \AA) in a single,homogeneous data-set. By combining all our fields we find that the faint endslope of the z=5.7 Lya luminosity function is very steep, with$\alpha=-2.3^{+0.4}_{-0.3}$. We also present an updated z=6.6 Lya luminosityfunction, based on comparable volumes and obtained with the same methods, whichwe directly compare with that at z=5.7. We find a significant decline of thenumber density of faint Lya emitters from z=5.7 to z=6.6 (by $0.5\pm0.1$ dex),but no evolution at the bright end/no evolution in L*. Faint Lya emitters atz=6.6 show much more extended haloes than those at z=5.7, suggesting thatneutral Hydrogen plays an important role, increasing the scattering and leadingto observations missing faint Lya emission within the epoch of reionization.All together, our results suggest that we are observing patchy reionizationwhich happens first around the brightest Lya emitters, allowing the numberdensities of those sources to remain unaffected by the increase of neutralHydrogen fraction from z~5 to z~7.

The Lyman-alpha luminosity function at z=5.7-6.6 and the steep drop of the faint end: implications for reionization