Electric field-induced second harmonic generation on the host-guest compound cobalticinium fluoride nonasil

Organometallic chromophores encapsulated in zeolite-like cavities are demon strated to be a promising system for third-order nonlinear optical effects. Nonasil, by isolating the chromophores, allows the application of strong e lectric fields. The Figure shows an optical micrograph of a crystal of the title compound flanked by two copper electrodes. When an electric field was applied, a strong second harmonic generation signal was observed.