Photoelectrical device for concentration detection, method for concentration detection thereof and method for testing an antibiotic susceptibility on bacteria

A photoelectrical device for concentration detection adapted to detect a concentration of a plurality of target bioparticles in a fluid sample, the photoelectrical device comprising:

• a light source, adapted to emit a light detecting beam;
• a substrate, having an upper surface;
• a driving electrode layer, disposed on the upper surface of the substrate and comprising a central electrode;
• an AC power source, electrically connected to the driving electrode layer;
• and
• a photoelectric conversion element, disposed oppositely to the driving electrode layer;
• wherein the substrate further has a lower surface opposite to the upper surface, the photoelectric conversion element is disposed on the lower surface of the substrate, the substrate is a transparent plate, and both the driving electrode layer and the photoelectric conversion element are transparent conductive films;
• wherein the light detecting beam irradiates on the photoelectric conversion element after passing through the driving electrode layer and the substrate, the fluid sample is adapted to be disposed on the upper surface of the driving electrode layer, the AC power source is used to generate a non-uniform alternating electric field in the fluid sample on the upper surface of the driving electrode layer, the non-uniform alternating electric field drives the target bioparticles to gather up on the central electrode to form a particle cluster, the photoelectric conversion element is used to receive the light detecting beam after passing through the particle cluster, the photoelectric conversion element outputs an electric current based on the light detecting beam, and the electric current changes as a concentration of the target bioparticles changes;
• and
• wherein the photoelectrical device further comprises a peripheral electrode located around the central electrode, and the central electrode is not in contact with the peripheral electrode.