Electro Dynamics of Micro-Structures

The interest to optical signal detection of nanoscale objects is growing rapidly. Theoretical modeling of optical scattering by nano-particles is complementary to the development of experimental techniques. We conduct numerical computations of scattering by objects which are both comparable to and much smaller than the wavelength of light. Currently, theoretical analysis of both single protein and retina scattering is underway. The employed techniques can be extended to the analysis of many other types of structures.

The retina contains scattering elements that are comparable in size to the wavelength of light. It is comprised of photoreceptor cells, which act as dielectric wave-guides. This natural microstructure has many interesting properties. Numerical modeling of the retina reveals complex interactions of different optical modes. This interaction may influence the visual response of an organism [Figure 1]. Furthermore, analysis of scattering in polarization sensitive retina (such as retina of birds and fish) may contribute to progress in the development of optical sensors. The retina is modeled using the Finite-Difference Time-Domain (FDTD) numerical algorithm. This research is a result of collaboration with Dr. Misha Vorobyev from the Center for Vision, Touch and Hearing of the University of Queensland and Dr. Andrey Zvyagin from Macquarie University.