(I) Micro-bridge structure comprising (a) Substrate with two first electrical contacts, (b) Microstructure with two second electrical contacts, (c) Micro-support for suspending the microstructure over and at a predetermined distance from the substrate layer, the support extending along a vertical axis and including a central upper cavity extending along a vertical axis within the support. The support has a lower end connected to the substrate layer and an upper end connected to and supporting the microstructure, and comprises two conductive paths and a dielectric extending from the upper to the lower ends and connecting the first and second contacts. Also claimed (II) is the method of forming the micro-bridge structure by; A) Providing the substrate with electrical contacts. B) Covering the substrate with a temporary layer and patterning and etching cavities to provide access to the contacts, the cavities also being for containing the legs of the support, each cavity extends along a vertical axis with a lower end opened out onto the contact. C) Forming a radiation reflecting layer over all, and patterning and etching it. D) Forming a first dielectric layer over all, patterning and etching it to expose the contacts, and then forming an electrically conductive layer over all followed by patterning and etching it so that it forms a part of the micro-support and provides an electrical path to the contacts. E) Forming a dielectric layer over all and patterning and etching it to provide access to the contacts on the substrate and form legs of the micro-support. F) Forming a sensing layer and patterning and etching it to define an active area. G) Forming a second electrically conductive layer and patterning and etching it to provide two electrical paths from two distal points of the radiation active layer to the electrical contacts of the substrate through the first conductive layer. H) Patterning and etching the first dielectric layer down to the temporary layer. I) Removing the temporary layer to reveal the microstructure which comprises a sensing layer suspended by means of the legs of a micro-support.    USE -   Fabrication of micro-sensors.    ADVANTAGE -   The structure is compact, deformation free, and the planarity of the micro-platform simplifies the process of forming it by standard photolithographic and etching techniques.