During a thunderstorm, we all know it’s common to hear thunder after we see the lightning. That’s because sound travels much slower (768 mph) than light (670,000,000 mph).
Now, Univ. of Minnesota engineering researchers have developed a chip on which both sound wave and light wave are generated and confined together so that the sound can very efficiently control the light. The novel device platform could improve wireless communications systems using optical fibers and ultimately be used for computation using quantum physics.
The research was recently published in Nature Communications.
The Univ. of Minnesota chip is made with a silicon base coated with a layer of aluminum nitride that conducts an electric change. Applying alternating electrical signal to the material causes the material to deform periodically and generate sound waves that grow on its surface, similar to earthquake waves that grow from the center of the earthquake. The technology has been widely used in cell phones and other wireless devices as microwave filters.
“Our breakthrough is to integrate optical circuits in the same layer of material with acoustic devices in order to attain extreme strong interaction between light and sound waves,” said Mo Li, assistant professor in the Dept. of Electrical and Computer Engineering and the lead researcher of the study.
The researchers used the state-of-the-art nanofabrication technology to make arrays of electrodes with a width of only 100 nm (0.00001 cm) to excite sound waves at an unprecedented high frequency that is higher than 10 GHz, the frequency used for satellite communications.
“What’s remarkable is that at this high frequency, the wavelength of the sound is even shorter than the wavelength of light. This is achieved for the first time on a chip,” said Semere Tadesse, a graduate student in the Univ. of Minnesota’s School of Physics and Astronomy and the first author of the paper. “In this unprecedented regime, sound can interact with light most efficiently to achieve high-speed modulation.”
In addition to applications in communications, researchers are pursuing quantum physics applications for the novel device. They are investigating the interaction between single photons (the fundamental quantum unit of light) and single phonons (the fundamental quantum unit of sound). The researcher plan to use sound waves as the information carriers for quantum computing.
Source: Univ. of Minnesota