Mi. Carvalho et al., DARK AND BRIGHT VECTOR SPATIAL SOLITONS IN BIASED PHOTOREFRACTIVE MEDIA, Physical review. E, Statistical physics, plasmas, fluids, and related interdisciplinary topics, 53(1), 1996, pp. 53-56
We show that the vector beam evolution equations in properly oriented
biased photorefractive media can exhibit bright-dark soliton pair solu
tions under steady-state conditions. These wave pairs are obtained per
turbatively provided that the intensities of the two optical beams are
approximately equal. Our analysis indicates that these bright-dark ve
ctor solitons exist irrespective of the polarity of the external bias
field. The stability of these vector pairs has been investigated numer
ically and it has been found that they are stable only in the regime o
f positive bias polarity.