In our paper [1], some inadvertent typing errors have been found and corrected as below. On page 1584, line 7 the sample length of 1cm is equivalent to 0.6 coupling lengths in vertical and 0.3 coupling lengths in horizontal direction. In line 22, for the device rotated by 45° the sample length is equivalent to 0.45 coupling lengths in horizontal and vertical direction and 0.15 coupling lengths in one diagonal direction. In line 9, the waveguide separation is 18 μm, as also indicated in Fig. 4.