Angle-selective transmission is the function of allowing a wave of certain incident angle to pass through the system. It is one of the essential functions in analog wave filtering and control systems. However, the incident-angle dependence and frequency dependence of wave transmission in existing systems are always coupled and cannot be controlled individually without influencing the other. This work reports the design of an angle-selection system that can decouple the incident-angle dependence and frequency dependence in acoustic transmission. The system is formed by the combination of two binary phase gratings with different grating periods. It selects not only the angle of incident wave, but also the frequency. The selected angle and frequency can be tuned independently by changing different geometric parameters in the binary phase gratings. The designed double grating system has the potential to serve as the building elements to construct arbitrary wave-filtering systems in the frequency-angle space, such as the broadband angle-selection system.

中文翻译：

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基于二进制相位光栅的声角度选择传输

角度选择传输是允许一定入射角的波通过系统的功能。它是模拟波滤波和控制系统的基本功能之一。然而，现有系统中波传输的入射角依赖性和频率依赖性始终是耦合的，并且不能在不影响彼此的情况下单独进行控制。这项工作报告了一个角度选择系统的设计，该系统可以使声传输中的入射角依赖性和频率依赖性解耦。该系统由两个具有不同光栅周期的二进制相位光栅组合而成。它不仅选择入射波的角度，而且选择频率。通过改变二进制相位光栅中的不同几何参数，可以独立地调整选定的角度和频率。