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一直以来条状表面等离子波导被认为是实现高集成光路的有效器件,首先采用经典的Drude模型对条状波导中SPP激发与传播特性完成了分析。针对可见光到近红外入射波长的条件完成了条状SPP波导的模场分布的研究,得出,当金属的厚度不变宽度越大,电磁场分布就越集中在条状波导的两侧;当金属条状的宽度不变,厚度越大时电磁场分布会越集中在金属内;入射波长越长会使得金属条状周围电场的集中越小,且还会导致信道间的干扰。利用得到的条状波导特性进而设计了一种新型的耦合器,器件设计结果表明:条状SPP波导在有限传输距离上能量完全转移只发生一次;波长较长时,场的集中度减小,耦合增强;条状SPP波导耦合器可以实现1 310 nm和1 550 nm的光波分复用。这一研究对光子器件的发展有一定的理论和实际意义。
Striped surface plasmon waveguides have long been regarded as effective devices for realizing highly integrated optical paths. Firstly, the classical Drude model is used to analyze the SPP excitation and propagation characteristics in a strip waveguide. The field distribution of strip SPP waveguide is studied under visible light to near infrared incident wavelength. It is found that the distribution of electromagnetic field concentrates more on both sides of the strip waveguide when the width of the metal is constant. The width of the strip remains the same. The greater the thickness, the more concentrated the electromagnetic field in the metal. The longer the incident wavelength, the smaller the concentration of the electric field around the strip and the interference between the channels. A new type of coupler was designed by using the strip waveguide characteristics. The design results of the device show that the energy transfer of the strip SPP occurs only once at the limited transmission distance. When the wavelength is longer, the concentration of the field decreases, Coupling enhanced; strip SPP waveguide coupler can achieve 1 310 nm and 1 550 nm wavelength division multiplexing. This research has a certain theoretical and practical significance for the development of photonic devices.