在光学集成中，金属表面的等离子体传输控制非常重要。应用表面波全息法设计结构控制表面等离子体波耦合到自由空间中的光波。模拟金属表面等离子波束与自由空间中目标光束的标量叠加，得到干涉光强。在光强极大值的地方刻蚀凹槽，获得凹槽结构。当表面等离子波入射到设计的结构中，凹槽散射等离子体波并在自由空间中进行叠加，得到所需的光束。利用此原理，在金属表面设计了两个结构，将传输的等离子体波耦合到自由空间中，汇聚于指定的一点或者两点。利用时域有限差分法模拟验证了此原理的可行性。这种耦合方式可以作为解决表面等离子体集成光路中探测问题的一种方案，将传输的表面等离子体信号耦合到自由空间，然后利用传统光电探测设备探测。

Transmission control of the plasma on the metal surface in optical integration is very important. Structures are designed to couple the surface plasmon polaritons (SPPs) to the light wave in free space by surface wave holography. Interference light intensity is obtained through simulating the scalar superposition of the SPP wave beam and the target beam in free space. Groove structures are obtained by etching grooves at the maximum light intensity positions. When the SPP waves are incident to the designed structures, the grooves scatter the SPP waves into free space and then the waves superpose there, generating the required light beam. Based on the principle, two structures are designed for coupling the SPP waves to focus on one or two specified points in free space. The finite-difference time-domain method is used to verify the principle. This coupled manner can be used as a method for solving the detection problem in the surface plasmon integrated optics. The SPP signal is coupled into free space and detected by common photodetectors.