OPTICAL PROPERTIES OF SMALL SPHERICAL PURE METAL IN PASSIVE AND ACTIVE HOST MATRICES

Abstract

In this thesis, we have studied the optical properties of small spherical pure metal in active and passive host matrix. One of the optical properties we have investigated by this work is the local eld enhancement factor for small spherical pure metal in passive and active host matrix. The results show that for small spherical pure metal there is only one maxima of the local eld enhancement factor in both the passive and active host matrix. We present an analytical and numerical method for optical bistability of small spherical pure metal in passive and active host matrix. Using the derived analytical and numerical results we calculated the cubic equation of the optical bistability of small spherical pure metal embedded in passive and active host matrix. To observe considerable di erences on the onset and o set parts of the plots of optical bistability for the active host matrix, we took the integer multiples for the imaginary part of dielectric function of the host matrix ( ′′ h), (i.e. ′′ h = −2, ′′ h = −3 and ′′ h = −4). The third main target of study was to derive the analytical and numerical results of the real and imaginary parts of refractive indices for small spherical pure metal embedded in a host matrix. We have plotted the graphs of the real and imaginary parts of the refractive indices of the analytical and numerical results for small spherical pure metal in active and passive host matrix. The numerical and analytical results show that the local eld enhancement factor is extremely enhanced, the optical bistability activation and the real and imaginary parts of the refactive index are increased when the small spherical pure metal is embedded in active host matrix (i.e. the natural or original property of the imaginary part of the dilectric function of the host matrix is a ected by applying additionalexternal dilectric function on the host matrix).