According to a report by the physicist organization network on July 16 (Beijing time), a new study by Columbia University in the United States proved that graphene has excellent nonlinear optical properties, and based on this, developed a graphene-silicon optoelectronic hybrid chip. This combination of silicon and graphene has brought people closer to ultra-low-power optical communication, making this technology widely used in optical interconnects and low-power photonic integrated circuits. Related papers were published on the website of Nature·Optics. The research team consists of engineers from Columbia University and researchers from the Singapore Institute of Microelectronics. By placing a graphene sheet of carbon atom thickness, they successfully converted a passive device that does not undergo photoelectric or electro-optic conversion into an active device that emits a microwave photon signal and converts the wavelength. The nonlinear optical properties of the new device can change system parameters such as transmittance and wavelength conversion and input power levels. The team also found that there is an electronic and thermal response on this light-driven hybrid chip that emits a radio signal that can be modulated by a laser. After modulating the radio signal with different optical frequencies, the graphene-silicon hybrid chip produces perfect radio resonance and requires 50 times less power than other scientists can achieve with pure silicon circuits. The researchers said that they produced a new optical frequency by mixing the two electromagnetic fields. The energy required to transmit the signal was much lower than that of the pure silicon circuit, and four-wave mixing was found in the experiment. This makes this hybrid structure a platform for processing large numbers of optical signals. Until recently, similar applications using graphene have only stayed on micron-scale chips, greatly limiting the performance of this material. Huang Zhiwei, a professor of mechanical engineering at Columbia University who led the research, said that graphene plays an important role in greatly improving the nonlinear optical performance of the original components, enabling digital switching and storage capabilities. Gu Tingyi, who participated in the research, said: "We have been able to prove and explain the nonlinear properties of graphene. This graphene-silicon hybrid chip has shown excellent performance in experiments and will become the construction speed in the future. The basis for faster, more efficient modern telecommunications components.†Columbia University associate professor James Horne said that the large-area, high-volume synthesis and production of graphene has become a reality, providing the basis for the production of such new chips. . And Philips Jin, a professor of physics and applied physics, believes that this excellent work shows that when graphene and silicon are combined, it is a unique optoelectronic material, and its ultra-fast nonlinear optical modulation performance will be ultra-fast chip. Many novel applications such as high-speed optical communication open the door. Since the British scientists used the "tape method" to obtain graphene, this high-strength, highly conductive material has been highly anticipated. But whether it is a graphene-based photonic sensor or a computer, its manufacturing and application premise is a deeper understanding of the nature of graphene. The new findings of American scientists reveal a new way to understand the characteristics of matter: the large-scale production capacity of graphene makes it possible to manufacture new optoelectronic devices, which in turn helps people understand the characteristics of this magical material. In turn, the application of graphene is promoted.
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