As new functional materials,porous silicon(PS)and porous silicon microcavity(PSM)have perfect performance in biosensors fabrication for many good properties,such as light-induced luminescence,micro-electronics compatibility,filtration ability,controllable growth of nano-micro holes.Many biosensors based on porous silicon and porous silicon microcavity have been fabricated,and applied in rapid detections of blood,bacteria,virus,DNA,etc.The structure and properties of PS and PSM are analyzed.The research stat...