“…The outputs of these interactions are electromagnetic fields with a different frequency, phase, and polarization to those of the input field. Originally, the NLO targets were inorganic-based salts, but in modern applications, organic-based architectures are particularly interesting because of their idiosyncrasies such as an ultrafast response time (due to the delocalized nature of the π-extended electrons), photothermal stability, and greater synthetic flexibility . As a result, these organic “NLO-phores” find potential applications in various technological domains including light emission transistors composed of charge-transfer polymers, organic photodiodes for imaging, photon microscopy, second harmonic generation, and two-photon absorption …”