Linear and nonlinear optical response of spiral-type excitons

We theoretically study linear and nonlinear optical responses of a thin film which consists of linear chains confining spiral-type Frenkel excitons. The peculiarities of this system appear in various properties such as the selection rule of optical transitions, complex modes structure of exciton–radiation coupled system, and polarization characteristics of the nonlinear signal. These results indicate that the nanoscale orientation structure of polarizations can be a significant degree of freedom to design novel photo-functions.