Fractal clusters in Eu doped polymer fiber studied by near-field scanning optical microscopy

Using near-field scanning optical microscopy (NSOM), we explore the chromatic dispersion and absorption characteristics of fractal clusters in Eu doped polymer fiber. We present the near-field transmitted light intensity of fiber slice. The near-field light intensity of dots with clusters and without clusters is analyzed and compared and the agreement is obtained between experiment and theory which is based on the effective-medium approximation (EMA) and the differential effective-medium approximation (DEMA) of fractal clusters, respectively.