Chinese and American scholars have teamed up to break the "time bandwidth limit" of resonator design"
Chinese and American scholars have teamed up to break the "time bandwidth limit" of resonator design"
Resonator devices and systems have been widely used in all walks of life in modern society, such as laser resonators, waveguides and so on. Leave the resonance, the computer is no longer computing, mobile phone, TV can display images, Shuabing can not watch radio radio, not timing...... For a long time, the design of a resonant system has been considered to be subject to a basic limit. Scientists discovered in 1914 that the resonator had longer storage time and narrower bandwidth, or larger bandwidth, but shorter storage time. Bandwidth indicates the amount of data storage. The "time limit bandwidth" means, in the resonant cavity for long time storage of big data is not possible, "a long time" and "big data" can not have both fish and bear's paw. The proposed time bandwidth limit law has never been challenged for more than 100 years. Physicists and engineers have been working on the design and construction of optical, acoustic, and electronic resonance systems. From the frontier of micro / slow light waveguides to the vibration in atomic / molecular structures, all types of resonators, crystal oscillators, etc., are limited by the time bandwidth limit. Many optical and electrical systems limited by time bandwidth Chinese and American scientists have broken the spell. Zheng Xiaodong explained the scientist's approach in a rough analogy. The resonator is like a room where the people at the gate enter and leave the house by swinging. The time limit of bandwidth of resonant cavity means that such a strange rule: if you swing speed, then with the same speed on the inside, can be in the room for a long period of time, and then unified swing out; if each other at different speeds, slow, it can only be in the house for a short period of time, went in to swing out. The new method proposed by scientists allows people to move into the house at regular intervals, leaving them no longer side by side, but moving outward in sequence at a controlled pace. That is to say, using the method of controlling energy entering and leaving the cavity at different rates, or design, non time symmetric resonant system, successfully broke the more than 100 years to limit the resonator design "time limit of bandwidth". The higher the degree of asymmetry, the higher the degree of the "limit". The next question is how to make the energy entering and leaving the resonant system at a freely adjustable rate, which is the key to the design of asymmetric systems. The use of the exclusive secrets is Nanchang University and the Zhejiang University cooperation on magneto-optical material / hybrid resonator waveguide system using this system, you can easily control the energy transmission rate of back propagation of electromagnetic waves in the terahertz band, the traditional time - bandwidth limit have been able to raise thousands of times. Theoretically, there is no ceiling in this asymmetric system, and bandwidth is no longer limited by the storage time of the energy. Zheng Xiaodong believes that the resonant system time bandwidth limit exceeded, will have a profound impact on many fields of physics and engineering, the potential application prospect is very extensive, including communications, optical detection, energy acquisition and information storage. For example, it is possible to achieve a truly continuous spectrum of direct current lasers. Humans can turn many of today's light sources into directional light sources, or even change the current solar energy storage model. It is expected that a large number of new devices and systems will emerge as the times require in the near future.
