A novel hollow core photonic crystal fiber (HCPCF) temperature sensor that is based on intensity modulation and metal-organic-coordinated Co-cage supramolecular material filled in the air holes of the fiber is introduced. Temperature-dependent character of the structure in the range of 90 to 190 oC has been investigated. The numerical analyses show that the confinement loss is both decreased linearly with temperature at 1 064 and 1 550 nm. For a 6.5-cm long HCPCF, the sensitivity of temperature
