According to the report of the American Physicists Network on January 31, a photodetector made of graphene can process and guide photoelectric signals very quickly, and photocurrent can be generated by photons that are stimulated by light in a picosecond, but There was no feasible way to measure these processes in graphene. Now, scientists at the Technical University of Munich, Germany, have developed a method to measure the temporal dynamics of ultra-high-speed photocurrents in graphene with time. In addition, they also found that graphene can emit terahertz radiation. The relevant research report was published in the recently published "Nature and Communications" magazine.
Graphene is truly fascinating to scientists because of its extremely high conductivity, which is very useful in the development of photodetectors. These electronic components can detect radiation and convert it into electrical signals, thus stimulating scientists to use graphene to design ultra-high-speed photodetectors. However, the temporal behavior of photoelectric behavior in graphene cannot be measured yet. For example, it is difficult to measure how long it takes for graphene to undergo electrical stimulation until it generates photocurrent.
Physicists at the Technical University of Munich have developed a method that for the first time increases the time resolution of measured photocurrents in graphene to the picosecond range, which allows them to detect pulses that are only a few picoseconds long.
The heart of the photodetector lies in the free-suspension of graphene that melts into the circuit through metal contact. The temporal dynamics of the photocurrent can be measured by a method called "coplanar stripline", which is evaluated by a special time-resolved laser spectroscopy program, the pump detection technique. The laser pulse will excite the electrons in the graphene, and the dynamics of this process will be monitored by another laser. With this technology, physicists can accurately monitor how photocurrents in graphene are produced.
The scientists also used new methods to further observe and found that when graphene is stimulated by light, it emits radiation in the terahertz (THz) range, which is located between infrared light and microwave radiation in the electromagnetic spectrum. What is special about Terahertz radiation is that it shows the shared properties of adjacent frequency ranges, which can be bundled like particle radiation and also permeate the characteristics of electromagnetic waves. This makes it an ideal candidate for material testing and can be applied in specific medical fields. (Zhang Hao)
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| Item | TGSG15-15 | TGSG20-20 | TGSG25-25 | TGSG30-30 | TGSG35-35 | TGSG40-40 | TGSG45-45 |
| Longgitudinal Tensile strength ≥ (KN/m) | 15 | 20 | 25 | 30 | 35 | 40 | 45 |
| Transverse Tensile strength ≥ (KN/m) | 15 | 20 | 25 | 30 | 35 | 40 | 45 |
| Longitudunal Elongation ≤ (%) | 15 | ||||||
| Transverse Elongation ≤ (%) | 13 | ||||||
| Longitudinal Tensile strength at 2% strain ≥ (KN/m) | 5 | 7 | 9 | 10.5 | 30 | 30 | 30 |
| Transverse Tensile strength at 2% strain ≥ (KN/m) | 5 | 7 | 9 | 10.5 | 30 | 30 | 30 |
| Longitudinal Tensile strength at 5% strain ≥ (KN/m) | 7 | 14 | 17 | 21 | 24 | 28 | 32 |
| Transverse Tensile strength at 5% strain ≥ (KN/m) | 7 | 14 | 17 | 21 | 24 | 28 | 32 |
| Width ≤ (m) | 6 | ||||||
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certificate more than 15 years.
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