The Study Of Transmission Properties With Double Cladding Metal Nanowires Utilizing Full Vector Analysis Method

Metal nanowires have important potential applications in the integrated optoelectronic devices design, and the research of the transmission characteristics has been got more and more attentions. In this paper, based on the vector analysis method in electromagnetic field theory, the transmission properties of double cladding metal nanowires are studied. Firstly, using the Helmholtz equation to solve the electromagnetic field distributions of metal nanowires, and metal nanowires dispersion equation is deduced under the boundary conditions. Through the analysis for the TM mode, TE mode, and the electromagnetic wave dispersion equation of higher order modes, we get the conclusion that TE mode does not exist in the metal nanowires. This work theoretically analyze the parameters which affect on the transmission characteristics in the incident wavelength of1.55micrometer, and these parameters include the incident wavelength, the radius of the metal medium, the cladding thickness and refractive index. The relative calculations are performed using both the full vector method and numerical simulation method, and we find that the larger the incident wavelength and the radius of the metal fiber core is, the better the performance of the metal nanowires transmission is, so trying to choose the larger incident wavelength and the radius of the metal fiber core in relative applications. The propagation distance decreases first and then increases with the increase of thickness of inner cladding, and it is important to note that the value of inner cladding can not be too small, so the appropriate thickness parameter should be chose in practice. While the propagation distance increases with the decrease of refractive index of inner cladding, therefore the medium with smaller refractive index should be applied. Furthermore, the results with the full vector method and numerical simulation is nearly consistent, it also indicates that the method of vector analysis is reasonable. In this paper, the study on the transmission properties of metal nanowires provides the important theoretical basis, which can be widely used in nano-optoelectronic devices design.