Fig. 4: Demonstration of a photovariable capacitor operation.
From: Anisotropic fluid with phototunable dielectric permittivity
a Schematic illustration of a sound-generating system with a photovariable capacitor consisting of a liquid-crystalline (LC) blend ([Azo-F] = 4 wt%). Sounds generated from an electric speaker were recorded using a microphone. b,c Real photoimages (upper) of a photovariable capacitor during blue light (BL) (b) and green light (GL) (c) irradiation and sound spectra (lower) obtained after BL (b) and GL (c) irradiation for 10 s. d Sound spectrogram generated by short-time Fourier transform of the audio recorded during alternate GL/BL irradiation for 10 s (Supplementary Audio 1). White dotted lines in the spectrogram represent the sound spectra in (b) and (c). White blurry regions (f < 1 kHz) denotes the resolution limit of a microphone.
