Metal oxide’s properties could enable a wide range of terahertz frequency photonics. Visible light is a mere fraction of the electromagnetic spectrum, and the manipulation of light waves at frequencies beyond human vision has enabled such technologies as cell phones and CT scans. Rice Universi
Rice University researchers have identified a way to utilize the “new terahertz gap” using strontium titanate, enabling the development of innovative optical technologies in the 3-19 terahertz range. This discovery could lead to advancements in quantum materials and medical diagnostics.Visible light is a mere fraction of the
Illustration of a quantum paraelectric lens that focuses light pulses with frequencies from 5-15 terahertz. Incoming terahertz light pulses are converted into surface phonon-polaritons by ring-shaped polymer gratings and disk resonators atop a substrate of strontium titanate .
Rui Xu, a Rice University materials science and nanoengineering student, is a lead author on a study that shows strontium titanate has the potential to enable efficient photonic devices at frequencies from 3-19 terahertz. Credit: Photo by Gustavo Raskosky/Rice UniversityZhu’s group has turned the strong interaction to its advantage with strontium titanate, an oxide of strontium and titanium.
Unlike other materials that support phonon-polaritons in higher frequencies and usually in a narrow range, strontium titanate works for the entire 5-15 terahertz gap because of a property called quantum paraelectricity. Its atoms exhibit large quantum fluctuations and vibrate randomly, thus capturing light effectively without being self-trapped by the captured light, even at zero degrees Kelvin.
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