Fig. 2: Electrical and optical properties of the ITO/PFO/aluminum device.

a Current density as a function of applied voltage. ITO acts as either an anode or a cathode for positive and negative values of the applied voltage. b Measured reflection spectra of the EFISH device. The reflection efficiency drops quickly when the wavelength of the incident light is less than 430 nm due to the absorption of PFO. The dashed-dotted line at a wavelength of 420 nm corresponds to the peak position of the SHG in the nonlinear optical measurements. The red dashed line and the blue dotted line are the calculated reflectances of the EFISH device and a single aluminum layer with a thickness of 100 nm