TABLE II.

Material parameters.

Parameter	Relative permittivity, ϵr	Conductivity, σ (S/m)
Polystyrene beads, ϵr	2.55	$1\times {10}^{-4}$
Liquid medium (water)	80	$1\times {10}^{-2}$
a-Si:H (ambient light)	11.7	$3\times {10}^{-2}$
a-Si:H (illuminated)	11.7	$2\times {10}^2$