Open AccessOptical bistability in graded granular composites
Author(s) -
Yamin Wu,
Guoqing Chen
Publication year - 2010
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.59.592
Subject(s) - bistability , optical bistability , dielectric , materials science , power law , core (optical fiber) , shell (structure) , field (mathematics) , hysteresis , composite material , condensed matter physics , optics , physics , nonlinear optics , optoelectronics , mathematics , laser , statistics , pure mathematics
We studied the intrinsic optical bistability(OB) of coated spherical particles with graded dielectric profiles.According to Maxwell equations, we obtained the spatial average of the local field in the core as a function of the external applied field. Numerical results for power-law graded profiles show that the optical bistable behavior is dependent on the shell thickness and the power-laws exponent k. The interval of optical bistability increases with increasing shell thickness or increasing k. In addition, the field-dependent reflectance at normal incidence R in random composites is also investigated, and a hysteretic loop is observed.