A new study by researchers at MIT reveals a chip-based solution that can make terahertz waves more accessible than ever.
Humans have figured out many ways to utilize radio waves, X-rays, microwaves, infrared light, and many other types of electromagnetic radiation. However, terahertz waves remain an unsolved puzzle.Scientists have known about terahertz waves for years.
Their unique properties suggest that these waves could enable high-bandwidth communication, ultra-fast data transfer, advanced medical imaging, and precise environmental monitoring. Additionally, their ability to penetrate various materials without harmful radiation makes them valuable for security screening, quality control in industries, and chemical sensing. However, until now, it has been challenging to harness the potential of these waves in electronic devices due to several technological limitations.Finally, a new study from researchers at MIT reveals a chip-based solution that can overcome these limitations and make terahertz waves more accessible than ever.What stops us from using terahertz waves?Terahertz waves are affected by the dielectric constant, a measure of how well a material can store and slow down an electric field. The lower this constant is the smoother terahertz waves can pass through a material.Unfortunately, silicon which is a key material in chips and electronic circuits has a high dielectric constant. “Because the dielectric constant of silicon is much higher than that of air, most terahertz waves are reflected at the silicon-air boundary rather than being cleanly transmitted out the back,” the study authors said.A common approach to improve THz wave transmission is to use silicon lenses, which focus and enhance wave power. These lenses not only generate terahertz waves but also boost their radiating power allowing them to cover long distances.However, there’s a catch. Due to their size and cost, silicon lenses can’t be integrated with electronic chips. Therefore one can’t use terahertz waves generated by these lenses for data transfer or any other electronic purpose.“Such lenses, which are often larger than the chip itself, make it hard to integrate the terahertz source into an electronic device,” the study authors said.A new chip design solves all the problemsThe MIT team developed a new method to improve how terahertz waves pass through silicon chips. As mentioned earlier, a significant portion of these waves gets reflected due to a mismatch between the properties of silicon and air, leading to signal loss. To address this, the researchers applied a principle called matching, which involves reducing the difference between silicon and air so that more waves can travel through.They first placed a thin sheet of material at the back of the chip. This sheet had properties that helped bridge the gap between silicon and air, allowing more waves to pass through rather than being reflected.Next, they used a laser cutter to create microscopic holes in the sheet, adjusting its properties so that it matched the THz waves more effectively. Finally, they incorporated high-frequency transistors, developed by Intel, which improved the generation and transmission of THz waves.“These two things taken together, the more powerful transistors and the dielectric sheet, plus a few other small innovations, enabled us to outperform several other devices,” Jinchen Wang, lead study author and a graduate student, said.This new design led to stronger and more efficient THz signals compared to existing methods. “The chip generated terahertz signals with a peak radiation power of 11.1 decibel-milliwatts, the best among state-of-the-art techniques. Moreover, since the low-cost chip can be fabricated at scale, it could be integrated into real-world electronic devices more readily,” the MIT team notes.However, creating a terahertz beam requires not just one but many such chips. The next step for the researchers is to scale their method to produce a large number of chips.The study will soon be presented at the IEEE International Solid-State Circuits Conference .
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