Design and optimization of the RGB beam combiner in micro display using entropy weight-TOPSIS method

Abstract

Red-green-blue (RGB) beam combiners are widely used in scenarios such as augmented reality/virtual reality (AR/VR), laser projection, biochemical detection, and other fields. Optical waveguide combiners have attracted extensive attention due to their advantages of small size, high multiplexing efficiency, convenient mass production, and low cost. An RGB beam combiner based on directional couplers is designed, with a core-cladding relative refractive index difference of 0.75%. The RGB beam combiner is optimized from the perspective of parameter optimization. Using the beam propagation method (BPM), the relationship between the performance of the RGB beam combiner and individual parameters is studied, achieving preliminary optimization of the device’s performance. The key parameters of the RGB beam combiner are optimized using the entropy weight-technique for order preference by similarity to an ideal solution TOPSIS method, establishing the optimal parameter scheme and further improving the device’s performance indicators. The results show that after optimization, the multiplexing efficiencies for red, green, and blue lights, as well as the average multiplexing efficiency, reached 99.17%, 99.76%, 96.63% and 98.52%, respectively. The size of the RGB beam combiner is 4.768 mm×0.062 mm.

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Central South University