  In this study, we propose an all-solid cladding dual-core metal fiber (DC-MF)
filled with toluene and ethanol for temperature sensing applications. Instead
of using air holes in the cladding region, we employ fluorine doped silica
glass to form an all-solid cladding. By selectively filling toluene and ethanol
into three air holes near the core region, we investigate the temperature
sensing characteristics numerically. Simulation results demonstrate that the
average sensitivity of the temperature sensing can reach -11.64 and -7.41 nm/C
within the temperature ranges of 0 to 70 C and -80 to 0 C, respectively, even
with a short DC-MF length of 1.6 mm. The maximum sensitivity in the considered
temperature ranges can reach up to -15 and -9 nm/C, respectively. Furthermore,
the proposed temperature sensor exhibits insensitivity to hydrostatic pressure.
