The reporter learned from Hefei University of Technology on the 17th that researchers from the school developed a new type of high-performance near-infrared light detector. This scientific research result was recently published in the top journal of the field of photonics, "Laser and Photonics Review."
Infrared detection technology is widely used in national defense, meteorology, industry, and medical fields. As a new type of detector technology, photon infrared detectors based on semiconductor nanostructures have attracted more and more attention in recent years. However, due to technical factors such as the size of the detector material, the performance of such optoelectronic devices still cannot meet the needs of use.
According to reports, scientific researchers of Hefei University of Technology applied the new type of surface-plasmon material, heavily doped with metal oxides, to infrared photodetectors for the first time, effectively solving the problem of insufficient light absorption of existing components, and realizing new types of infrared detectors. Responsiveness, detection rate, response speed and other aspects have greatly improved.
Existing infrared detectors employ noble metal nanostructures as surface plasmon materials, and the absorption of incident light by the optoelectronic devices is enhanced by scattering of metallic nanoparticles. Since the noble metal surface plasmon resonance position is usually in the visible light range, the current surface-plasmon-enhanced devices are mainly limited to photodetectors in the visible light range.
The micro-nano functional materials and devices laboratory led by Prof. Luo Linbao of the School of Electronic and Applied Physics, Hefei University of Technology, has pioneered the preparation of a new type of heavily doped indium tin oxide nano-particle surface plasmon material. Applied to nano infrared light detectors. The correlation analysis of the device shows that the light-absorbing capability of the device optimized for structure at 1550 nm (communication band) has been significantly enhanced, and the corresponding responsivity and detection rate have also been greatly improved. At the same time, this device still has excellent response capability to optical signals with frequency up to 1 MHz, and its response speed can reach 450 nanoseconds, which is far superior to existing nano-infrared detectors.
“This new material can effectively solve the problem of energy matching between the detection wavelength of the infrared detector and the local surface plasma of the traditional noble metal nanostructure surface plasma material. It not only achieves a significant increase in performance in the commonly used communication band, but also can pass through. The doping concentration of tin in the material is changed to achieve effective detection of infrared light at other wavelengths, said Professor Luo Linbao.
At the same time, this research result is of great significance for enriching the relevant theory of surface plasma optics and developing new high-performance surface-plasma optoelectronic devices such as solar cells, photodetectors, and light-emitting diodes. (Zhou Hui Wu Lan)
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