It was found for the first time that a phase grating was formed with variations in thickness and refractive index with a period of half the wavelength of surface acoustic waves, when a thin film was deposited on a substrate in which a standing surface wave was excited. No such phenomenon has been reported before, and its application to optical elements is expected to be a new application of surface acoustic waves.

The fabrication of a two-dimensional millimeter-sized pattern of micrometer-sized titanium dioxide particles in UV-reactive acrylic resin using 1.93 MHz ultrasound is demonstrated. A mixture of particles and resin is set in a thin layer between square glass plates of which one plate is irradiated with ultrasound. Both vibration normal to the plate and the wave propagating in the mixture form standing waves to provide a two-dimensional pattern of the particles. Scanning electron microscopy and X-ray diffraction analysis of the UV-hardened pattern indicate that the titanium dioxide particles are embedded in the resin.

Fabrication of thin film phase grating using surface acoustic waves

Citations

Two-Dimensional Patterning of Inorganic Particles in Resin Using Ultrasound-Induced Plate Vibration

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