Surface polaritons propagation along micropipettes

The choice of the type of micropipette that can provide good field localization as well as energy efficiency is the problem of current interest. Up till now, exact analysis of cylindrical modes has been carried out only for waveguides with dielectric cores. In this paper the characteristics of the metal core cylindrical modes are investigated theoretically in comparison with the metal cladding modes at the core radius tending to zero. It is shown that the metal core can be promising for improving the micropipette energy efficiency because of unique localization properties of the cylindrical surface polaritons (CSP) propagation along the metal core.