To overcome the disadvantages of the tradition semi-physical simulation and injection simulation equipment in the performance evaluation of the infrared imaging system (IRIS), a low-cost and reconfigurable IRIS simulator, which can simulate the realistic physical process of infrared imaging, is proposed to test and evaluate the performance of the IRIS. According to the theoretical simulation framework and the theoretical models of the IRIS, the architecture of the IRIS simulator is constructed. The 3D scenes are generated and the infrared atmospheric transmission effects are simulated using OGRE technology in real-time on the computer. The physical effects of the IRIS are classified as the signal response characteristic, modulation transfer characteristic and noise characteristic, and they are simulated on the single-board signal processing platform based on the core processor FPGA in real-time using high-speed parallel computation method.
The paper presents a novel long-range hybrid insulator-metal-insulator (IMI) plasmonic waveguide, which is composed of two silicon wedge nanowires and a cylinder metal nanowire. Compared with other hybrid plasmonic waveguide, the proposed waveguide shows better properties. With strong coupling between the silicon nanowire mode and long-range surface plasmon polariton (SPP) mode, both deep subwavelength mode confinement and low propagation loss have been achieved. The properties of the hybrid IMI plasmonic waveguide including propagation length (L), normalized mode area (Aeff /A0) and figure of merit (FoM) are evaluated. Compared with the hybrid plasmonic waveguides, the designed waveguide enables an ultra-small deep-subwavelength mode in smaller area. The propagation length is nearly 1mm and FoM is ~104, which is larger than that of wedge or rectangle hybrid plasmonic waveguides. We also evaluate the impacts of practical fabrication imperfections on the mode properties. The results show that the proposed waveguide is fairly tolerant to the practical fabrication errors in geometry parameters. The proposed waveguide has many potential applications for nano-photonic components of high performance.
In this paper, we design and analyze a novel hybrid cylinder-triangle plasmonic waveguide (HCTSPPs), which is composed of three high index dielectric cylinders placed above an equilateral triangular metal with the center corresponding to the three vertices of the triangle. The strong hybridization coupling between Si dielectric cylinders (SDCs) and the metallic triangular wedge SPP (WSPPs) enables enhanced field confinement inside the gap region as well as long propagation length. It is also shown that relative long propagation length (100 λ ) and ultra-small deep subwavelength effective mode area (λ2/4000) can be realized by gradual modification of the geometric size, which is one-order improvement compared to other hybrid waveguides. Moreover, an investigation of the effects of actual fabrication errors on the mode properties about HCTSPPs indicates that mode properties are also quite tolerant to fabrication deviations. The proposed waveguide could be applied to subwavelength laser devices and optically integrated circuits.
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