Sensor spot, sensor cap and sensor with improved excitation light yield

A sensor spot of an optochemical sensor for determining a concentration of at least one analyte in a medium, the sensor spot comprising:

• a membrane composed of a plurality of layers, consisting essentially of:
• an analyte-permeable cover layer arranged to contact the medium during operation;
• a reflector layer, which contains TiO2, arranged on a side of the cover layer facing away from the medium;
• an analyte-sensitive pigment layer arranged on a side of the reflector layer facing away from the medium, wherein the membrane contains at least one analyte-sensitive luminescent dye, wherein a luminescence of the analyte-sensitive pigment layer depends upon a concentration of the at least one analyte;
• an aerogel layer arranged on a side of the analyte-sensitive pigment layer facing away from the medium, wherein the aerogel layer consists of a silicate aerogel;
• and
• a glass substrate arranged on a side of the aerogel layer facing away from the medium.