A research team from the University of California, San Diego has developed a nanostructure-based light-controlled microelectronic device that does not rely on semiconductor conduction. Under the conditions of low voltage and low power laser excitation, the conductivity can be improved compared to existing semiconductor devices. Nearly 10 times. This result was published in the November 4th issue of Nature Communications.
Traditional semiconductor devices are limited by the material itself and have limits in terms of frequency and power consumption. However, the use of free electrons to replace semiconductor materials usually requires high voltage, high power laser pointer or high temperature excitation. The team processed a mushroom-like nanostructure (called a “metamaterial” structure) with gold on a silicon wafer, which can release free electrons under the excitation of a DC voltage below 10 volts and a low-power infrared laser, thereby Greatly improve the conductivity of the device.
This device cannot completely replace semiconductor devices, but it may be best used under special needs, such as ultra-high frequency devices or high-power devices. In the future, different surface structures of metamaterials may be suitable for different types of microelectronic devices, which are used in photochemistry, photocatalysis, photovoltaic conversion and other fields. Compared with conventional laser systems, fiber lasers have obvious advantages in terms of compact layout, heat dissipation, beam quality, volume, and compatibility with existing systems, and are widely used in the field of communications.
The mode-locked fiber laser with rare-earth-doped fiber as the gain medium can produce ultra-short optical pulses with high repetition rate and pulse width in the order of picoseconds or femtoseconds, and its lasing wavelength falls within the best window of optical fiber communication 1.55 μm On the band, it is the ideal light source for the future high-speed optical communication system. Now, the mode-locked fiber green laser pointer with repetition frequency of 10GHz and 40GHz has been successfully developed. Once this kind of communication network is laid out, the demand for this example laser will be huge.
The application of fiber laser in therapy. Today, most of the lasers used in clinics are argon ion lasers, carbon dioxide lasers, and YAG lasers, but they usually have low beam quality, have a very large volume, require a huge water cooling system, and are very poor in installation and maintenance. It can be supplemented by fiber lasers. Since water molecules have an absorption peak at 2 μm, using a 2 μm fiber laser as a surgical tool can achieve rapid hemostasis and eliminate the smashing of the human body structure by the operation.