Open AccessEffect of temperature on optical bistability of coated granular composites
Author(s) -
Yamin Wu,
Guoqing Chen
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.2056
Subject(s) - bistability , optical bistability , core (optical fiber) , local field , field (mathematics) , materials science , condensed matter physics , dielectric , volume fraction , physics , nonlinear system , nonlinear optics , composite material , quantum mechanics , optoelectronics , mathematics , pure mathematics
We study the intrinsic optical bistabilityOB of nondilute suspensions of coated spherical particles with a metallic core and a nonlinear dielectric shell. In this kind of system as the spatial local field is not uniform, it cannot be obtained exactly. In this connectionwe establish the self-consistent mean field approximation and obtain the spatial average of the local field squared in the core as a function of the external applied field. Numerical results show that the optical bistabilityOB is dependent on the temperature T the structural parameter k and the volume fraction f. For given k and f the width of optical bistability decreases with increasing temperature. At further increasing of T OB is found to vanish. On the other hand for given T and f the bistable region gradually increases as the structural parameter k increases accompanied with the increase in both the upper and lower threshold fields. More exactly the increase of the bistable region mainly results from the rapid increase in the upper threshold field.