Abstract
New aspects of exciton–radiation interaction are discussed from the viewpoint of microscopic nonlocal optical response developed for the study of nano-structure materials. Emphasis is put on (a) radiative width as a general measure of coupling strength, by which various mechanisms of enhancement and suppression of the coupling strength are discussed for a wide variety of {size, shape and arrangement} of a sample, (b) the effect of LT (longitudinal-transverse) splitting on the excitons in a quantum dot, and (c) the spatial structure of resonant light and its size-resonant enhancement, which leads to a remarkable new type of nonlinear processes with a doubly resonant enhancement effect.
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