Subwavelength Slot Seam Super Transmission Mechanism In The Structure And Applied Research In Optical Fiber Communication

There has been wide range of research in the physical origin of Extraodinary Optical Transmission(EOT) and using it to design optical devices since EOT was reported when light wave goes through arrays of sub-wavelength apertures on a piece of metallic film. The study shows that the surface plasmons played a crucial role in the phenomenon of EOT.Based on the above research background, starting from Maxwell's equations, the rigorous coupled-wave theory is adopted to analysis the physical origin of EOT.Through investigating the structure of groove-slit, design a subwavelength metal structure,when the light of 1550nm wavelength goes through the structure, the structure can achieve optical amplification in one direction, while the strucre can achieve optical isolation in another direction.The details are as follows:1. Currently the physical origin of EOT is not very clear, the current internationally accepted models of EOT are SPP, CDEW and CM models. By simplifying the structure of the metal film, the transfer matrix is used to calculate the transmission rate. We study the effects of structural parameters on the transmission rat by rigorous coupled-wave, and compare the simulation results with the analytical solutions, at the same time explain the simulation results using analytical solutions, the above research provides a reference for understanding the physical origin of EOT.2. The EOT has been widely used in the design of optics,but now most people focused on the wavelength between 380nm to 800nm,presently there is little research on optical fiber communication windows. We studied the effects of groove-slit's structural parameters on the transmission rat by rigorous coupled-wave. (1) we find that transmission rate periodically varies with the distance between groove and slit,the amplitude will reduce as the the distance between groove and slit increases. (2) we also find that with the growing number of grooves, strengthening and weakening degree of transmission increase,but when the number reaches a certain amount (the number of grooves n = 4) the degree will stabilize.3. According to the research of the enhanced position and weakened position,we design the location of grooves and realize the amplification and isolation of light in 1550nm wavelength.In order to achieve better effect,we design a cyclical double-slit structure.As the communication window of 1550nm is unique, the design provides a reference for the application of EOT in the optical communication.