Large Increase in the Second-Order Nonlinear Optical Activity of a Hemicyanine-Incorporating Zeolite Film

摘要

A second-order nonlinear optical (2NLO) material generates a second harmonic (2ω) from an incident laser beam with the frequency of ω and shows electro-optic properties. 2NLO materials are currently widely used as key materials for optical communication, optical switching, laser components, IR detectors for medical and military applications, and so on. Although some 2NLO materials are commercially available, their tensor components of the quadratic NLO susceptibilities (d_(mn)) are not high enough to be used in miniature integrated photonic devices. Therefore, the search for 2NLO materials with exceptionally high activities has to be continued not only to enhance their functions in current applications but also to help expedite the materialization of photonics in which photons instead of electrons are used for signal processing, transmission, and storage.