“…Micro-electro-mechanical systems (MEMS) comprise both mechanical and electronic components manufactured on a common silicon substrate, and have gained significant attention in the last three decades. Due to the miniaturized size, low cost, high manufacturing throughput, and expectance of superior performance, MEMS are used in a wide range of consumer, automotive, medical, and industrial products [1,2]. With the increase in the integration density and the reduction in the feature size, high-aspect-ratio (HAR) structures in silicon play an increasingly important role in micro-sensors and actuators [3,4].…”