Research On The New Resonant Cavities Using Metamaterial

More and more interest in metamaterial has been driven by their unusual properties. Since metamaterial were created for the first time for the microwave range in2000, metamaterial has swept the world in just ten years. It has formed a four research areas:the existence proof of metamaterial, analysis of electromagnetic characteristics of metamaterial, the construction technology of metamaterial and the application of metamaterial at el. In this paper, in summing up the relevant research work on metamaterials, we propose designing the Fabry-Perot cavity using metamaterial to regulate and improve the performance of the existing conventional resonator.Metamaterial is composed of spatially periodic arrangement of the resonant unit cells, of which surface plasmon resonance can lead to negative permittivity and negative permeability. Then this "double negative" metamaterial has the extraordinary properties that common materials don’t have, such as the left-handed property, the backward wave, negative refraction, the inverse Doppler effect, and the reverse Cerenkov radiation effect. More importantly, according to the actual application requirements, humans can regulate electromagnetic characteristics of metamaterial through the cell structure of the metamaterial. In this paper, we regulate and improve the performance of the Fabry-Perot cavity by using the adjustable and controllable electromagnetic properties of metamaterial. The method has broad application prospects in design and development of the resonant cavity.In this paper, we have completed the following three aspects:Firstly, we design three negative refraction metamaterials for the optical range. Using CST simulation software, we analysis the parameters of the resonance unit, the resonance unit layer thickness, and the resonant unit spacing’s influence on properties of metamaterial. The results show that with the resonant cell size is increased proportionally, the resonant frequency is approximately monotonous translated; Resonant frequency and response bandwidth can be adjusted by regulating the parameters of the resonant unit.Secondly, we design the ordinary Fabry-Perot cavity. Through modeling and simulating in CST simulation software, we analysis electromagnetic coupling hole size, the reflector size’s impact on the performance of the Fabry-Perot cavity. The results show that the electromagnetic coupling hole size affects the strength of the resonance, and the size of the reflector determines whether to produce the resonance and the transverse and longitudinal modes.Thirdly, we design the new Fabry-Perot resonant cavities using metamaterial. Through modeling and simulating in CST simulation software, we analyze the impact of metamaterials on the transverse, longitudinal mode of the Fabry-Perot cavity. The results show that the negative refraction metamaterial can adjust the transverse, longitudinal mode of the new Fabry-Perot metacavity. More importantly, the new Fabry-Perot metacavity can break through the limit of the minimum half-wavelength cavity length to achieve a smaller size.