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University of Utah hits terahertz milestone
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Distinguished Professor Valy Vardeny, was published in a recent edition of Nature Communications. By depositing a special form of multilayer perovskite onto a silicon wafer, Nahata and Vardeny could modulate the amplitude of Terahertz waves passing through it using a simple halogen lamp. Previous attempts to do this have usually required the use of an expensive, high- power laser. What made this particular demonstration di erent is that it was not only the lamp power that allowed for this modulation but also the specific colour of the light. Consequently, the team found that they could put di erent perovskites on the same silicon substrate, where each region could be controlled by di erent colours from the lamp. This is not easily possible when using conventional semiconductors like silicon. “Think of it as the di erence between something that is binary versus something that has ten steps,” is how Nahata explains the properties of this new structure. “Silicon responds only to the power in the optical beam but not to the colour. It gives you more capabilities to actually do something, say for information processing or whatever the case may be.”
Work by the University of Utah on perovskite, a mineral discovered in Russia in the 1830s, could hold a key to the next step in ultra- high-speed communications and computing. Researchers from the university’s Departments of Electrical and Computer Engineering and Physics and Astronomy have discovered that a special kind of perovskite, a combination of an organic and inorganic compound that has the same structure as the original mineral, can be layered on a silicon wafer to create a key component for the communications system of the future. That system would use the Terahertz spectrum, the next generation of communications using light instead of electricity to shuttle data. The Terahertz range is a band between infrared light and radio waves and utilises frequencies that cover the range from 100 to 10,000 Gigahertz . Scientists are studying how to use these light frequencies to transmit data because of its potential for boosting the speeds of devices such as Internet modems or mobile phones. The new research, led by University of Utah Electrical and Computer Engineering Professor Ajay Nahata and Physics and Astronomy
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A high-speed milstone: Valy Vardeny and Ajay Nahata
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ISSUE 11 | Q4 2017
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