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| anubiszf | 2010-01-07 20:32 |  
| The spatial spectrum is obtained by using a lens to UF<uU-C" do Fourier transform and the far-field spectrum is recorded l#H#+*F
 by a CCD camera positioned in its focal plane. 5c^Z/
Jl$c
 First, we summarize our results of on-axis excitation of a $;/}?QY(
 single 2D gap soliton in Fig. 1. Different from previous .$%Soyr?,
 experimental observations in which either the probe beam "9^j.
 was launched off-axis to match the edge of the first BZ [6] fD07VBS	yl
 or its input phase or spectrum was engineered [11], we `>?ra-
 demonstrate on-axis excitation of a 2D gap soliton without _:-ha?W$;y
 a priori phase or spectral engineering. In fact, we show 'eJ+JM<0%
 
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