The invention discloses a micro-fluidic
chip integrated with an optical modulation cavity and a biological sensing device, and relates to the technical field of optical detection. The micro-fluidic
chip comprises a substrate layer, an optical structure layer and a detection
pool layer which are sequentially arranged from bottom to top, the optical structure layer is provided with an incident modulation cavity, an emergent modulation cavity, an incident
optical fiber groove, an emergent
optical fiber groove and a sensing interface, and the incident modulation cavity and the emergent modulation cavity are both micron-sized polyhedral integrated cavities. The detection
pool layer is provided with a
lofting structure suitable for placing a sample to be detected, the incident
optical fiber groove is suitable for inserting an incident optical
fiber, and the emergent optical
fiber groove is suitable for inserting an emergent optical
fiber; incident light introduced by the incident optical fiber is subjected to first modulation through the incident modulation cavity, then reaches the sensing interface and acts on a sample to be detected, and is reflected into emergent light; the emergent light is subjected to second modulation through the emergent modulation cavity and then is led out through the emergent optical fiber. The micro-fluidic
chip can realize a biosensing function, is high in sensitivity and low in sample and
reagent consumption, and can be easily combined with a
microscope and the like.