An implantable sensor element (110) for detecting at least one analyte in a sample of body fluid is disclosed. The sensor element (110) comprises at least one measurement chamber plate (114) adapted to receive the sample of bodily fluid. The sensor element (110) comprises at least one illumination source (118) designed to generate at least one illumination light beam (120) in at least one spectral range and to transmit the illumination light beam (120) to the measurement chamber plate (114) such that the illumination light beam (120) at least partially illuminates the measurement chamber plate(114). The measurement chamber plate (114) is designed to generate at least one reflection light beam (130) in response to the illumination by the illumination light beam (120) such that the reflection light beam (130) at least partially illuminates the sample of body fluid within the measurement chamber plate (114). The sensor element (110) comprises at least one optical detector (132) designed to detect at least one property of the reflection light beam (130) and to generate at least one sensor signal dependent on the presence of the analyte. The sensor element (110) furthermore comprises at least one control unit (126) designed to evaluate the sensor signal.Linvention concerne un élément capteur implantable (110) permettant de détecter au moins un analyte dans un échantillon de fluide corporel. Lélément capteur (110) comprend au moins une plaque de chambre de mesure (114) conçue pour recevoir léchantillon de fluide corporel. Lélément capteur (110) comprend au moins une source déclairage (118) conçue pour générer au moins un faisceau de lumière déclairage (120) dans au moins une plage spectrale et pour transmettre le faisceau de lumière déclairage (120) à la plaque de chambre de mesure (114) de telle sorte que le faisceau de lumière déclairage (120) éclaire au moins partiellement la plaque de chambre de mesure (114). La plaque de chambre de mesure (114) est conçue pour génére
