Fig. 1. (a) Schematic diagram of the femtosecond laser-assisted selective infiltration setup; inset, optical microscope image of a PCF with all holes sealed by a section of SMF. (b) Cross-sectional view of the PCF with three holes selectively infiltrated (white spot indicates the hole filled with standard 1.48-RI liquid).

Fig. 2. (a) Transmission spectra of filled PCF with different length and (b) transmission spectrum of the proposed device.

Fig. 3. Working principle of the proposed sensor. The liquid rods are highlighted in dark red.

Fig. 4. (a) Calculated profiles and dispersion curves of the guided modes in the proposed device. (b) Phase-matching relationship of the coupling between the core and rod modes at 17°C and 22°C, respectively.

Fig. 5. (a) Transmission spectra evolution of the proposed device as temperature increases from 18°C to 21°C and (b) relationship between the temperature and wavelength shift of Dips A and B.

Fig. 6. Relationship between strain and shift of the wavelengths of the characteristic peaks. Insets (a) and (b) represent the variations of Dips A and B as the strain increases, respectively.