Simultaneous measurement of temperature and magnetic field based on cascaded photonic crystal fibers with surface plasmon resonance

Two segments of gold-layer filled photonic crystal fibers (PCF) are joined together to achieve localized Surface Plasmon Resonance (SPR) effect. The cladding air-holes of both two PCFs are selectively filled with magnetic fluid (MF) while only one PCF would be applied a transverse force. The optical field distributions and loss spectra at different wavelengths are calculated and simulated using the finite element method (FEM). Results show that a blue-shift of the loss peaks will be obtained with the increase of applied transverse force. Based on the dependence of the MF refractive index on temperature and magnetic field, the sensitivity of the spectral response of the device to magnetic field and temperature is characterized, and the results of its application as a dual-parameter PCF-based sensor are also presented.