Study Of Optical Tamm State Photonic Devices In Metal-periodical Structure

Due to the advantages such as fast response time, free of electro-optical conversion and ease of system integration, micro-nano devices have wide application prospects in fields such as optical switching, optical sensing, optical information processing and so on. Surface plasma excited in the model combined by metal and micro-nano structure can realize operations on sub-wavelength level because of overcoming diffraction limit and remarkably enhancing intensity. It opens up a new way to design miniaturized, high-performance and low-threshold photonic devices.As a new type of metal surface plasma, optical Tamm state is easy to be excited and has much stronger intensity. All of these are helpful to promote performance of devices and develop new functions and applications. Related work on optical Tamm state has a great significance on both theoretical research and practical application. A new photonic device based on optical Tamm state excited in a well-designed structure is proposed. The details are as follows:At first, basic concepts of the special metal surface plasma, i.e., optical Tamm state are introduced. Furthermore, we focus on describing its unique advantages and research status.Secondly, formation principles and theoretical models of optical Tamm state are presented. We propose an optimized simulation method by using the self-consistent theory and the modified transfer matrix method. Taking metal-distributed Bragg reflector as an example, we study reflection spectrum and the electric field distribution. The results show that a dip corresponding to the optical Tamm state appears in the reflection spectrum. Meanwhile, by analyzing the distribution of electric field in different wavelengths, the intensity related to OTS eigen wavelength is remarkably enhanced at metal- distributed Bragg reflector interface.Next, asymmetric distributed Bragg reflector-metal-distributed Bragg reflector structure is introduced by mismatching central wavelengths of the two distributed Bragg reflectors. In the novel structure, through the analysis on physical characteristics and variation rules of double OTSs, we find that the intrinsic wavelengths of the two OTSs will red-shift with the variation of mismatch ?. By detuning the mismatch ?, the intensity of OTSs are also controllable, i.e. the intensity at each metal-distributed Bragg reflector interface can be arranged. Besides, injection angle of the incident light has a considerable influence on the existence of one or two OTS in this asymmetrical structure.At last, Kerr medium is introduced in the asymmetric distributed Bragg reflector-metal-distributed Bragg reflector structure. By choosing proper parameters of distributed Bragg reflector period, mismatch and metal thickness, an optimized structure that notably enhances intensity is obtained. It further reinforces the nonlinear effect in Kerr medium. A novel low-threshold all-optical bistable logic control device is designed based on the optimized structure, i.e., pump light and probe light are chosen near two OTSs, respectively. Intensity and injection angle of pump light can induce bistable effect. Therefore, logic control of probe light is realized. The threshold of the novel device is two orders of magnitude smaller than those have been reported.