Embodiments of the invention relates to a temperature sensor and an analytical device comprising the same. The temperature sensor comprises a carrier (11) with a detection surface (12) on which temperature indicating agents (14) are present and, optionally, at which target components can collect and optionally bind to specific capture elements. An incident light beam (Ll) is transmitted into the carrier and evanescent wave excitation is inducedat the detection surface (12). The amount of light in the reflected light beam (L2) or an optical, e.g. luminescence response is then detected by a light detector (31). In one example, evanescent light is affected (absorbed, scattered) by temperature indicating agents and optionally target components and/or label particles at the binding surface (12) and will therefore be missing in a frustrated total internal reflected light beam (L2). This can be used to determine the temperature of the detection area and optionally the amount of target components at the binding surface (12) from the amount of light in the reflected light beam (L2, L2a, L2b). A magnetic field generator (41) is optionally used to generate a magnetic field (B) at the bindingsurface (12) by which magnetic label particles (1) can be manipulated, for example attracted or repelled.