0000000001302749
AUTHOR
Abdullah F. Alabiad
Extraordinary nonlinear transmission modulation in a doubly resonant acousto-optical structure
International audience; Acousto-optical modulators usually rely on coherent diffraction of light by a moving acoustic wave, leading to bulky devices with a long interaction length. We propose a subwavelength acousto-optical structure that instead relies on a double resonance to achieve strong modulation at near-infrared wavelengths. A periodic array of metal ridges on a piezoelectric substrate defines cavities that create a resonant dip in the optical transmission spectrum. The ridges simultaneously support large flexural vibrations when resonantly excited by a radio-frequency signal, effectively deforming the cavities and leading to strongly nonlinear acousto-optical modulation. The nano-o…
lfixe.mp4
The movie shows the temporal evolution of the optical transmission through a nanophotonic periodic structure that is being deformed as a function of time by an acoustic resonance at 500 MHz. The optical wavelength is fixed. The vibrating pillars are made of silver and the piezoelectric substrate is made of lithium niobate. The period of the structure is 640 nm.
lfixe.mp4
The movie shows the temporal evolution of the optical transmission through a nanophotonic periodic structure that is being deformed as a function of time by an acoustic resonance at 500 MHz. The optical wavelength is fixed. The vibrating pillars are made of silver and the piezoelectric substrate is made of lithium niobate. The period of the structure is 640 nm.