Resonant Enhancement of Internal Field as a Function of Mesoscopic System Size: An Unnoticed Source of Large Optical Nonlinearity in Nonlocal Response
By means of the nonlocal theory of linear response, it is shown that the internal field in resonance with excitons in a mesoscopic system has a remarkable size dependence, which plays an important role in the size dependence of nonlinear response of the excitonic system. In the energy region of the exciton resonance, the internal field is enhanced resonantly with system size due to the interference of the exciton polaritons. This is shown by calculating the polariton modes in a thin film with, using an ABC-free theory for the linear response in a nonlocal system. The important size region for the resonant enhancement of the internal field coincides with that for the size-enhancement of third-order nonlinear susceptibility χ (3) therefore, a proper use of the former effect could bring about quite a large non-linearity of exciton resonance.
KeywordsInternal Field Nonlocal Theory Exciton Resonance Resonant Enhancement Polariton Mode
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- 3.Banyai L, Hu YZ, Lindberg M, Koch SW (1988) Phys Rev B37: 8142–8153Google Scholar