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We construct a dimethylsulfoxide (DMSO)-based photonic crystal fiber (PCF) temperature sensor with enhanced sensitivity. A solid-core PCF with large mode area is employed to supply the in-line Mach-Zehnder interference between the fundamental and cladding modes. Thus, temperature sensing can be realized because of the shift of interference spectrum at different temperatures.The DMSO solvent is infiltrated between the main sensor and a silica tube to increase the temperature sensitivity of the sensor. The obtained sensitivity (0.315 nm/ • C) is one or two orders of magnitude higher than that of previously published results. The proposed sensor is adapted for high-temperature sensing.

In order to provide a consistent explanation of the operation, the factors contributing to the current through an MPS diode were analysed in forward biasing on an n-type, mesoporous structure. The diodes having a degenerate n-doped ITO metallisation were characterised by recording the temperature dependent I-V characteristics in a vacuum cryostat in the temperature range of T = 100 K to 300 K. A systematic deconvolution of the obtained I-V curves, after stripping them from the contributions of ohmic conductance, resulted in a purely Fowler-Nordheim tunnelling behaviour. The present analysis in forward operation lead to very similar results as obtained formerly in the reverse biasing case [Molnar et al., J. Lumin. 80, 91 (1999)], except that no significant electroluminescence was observed here.

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