We demonstrate and optimize a microfluidic refractive index sensor with ultra-high sensitivity based on an acoustic
grating in a solid core photonic bandgap fiber. The sensitivity of the acoustic grating's resonance is 17 900 nm/RIU
which corresponds to smallest detectable changes in refractive index of 8.4×10-6.
We present in this paper the fabrication and characterization of thermally stable double line waveguides in Z-cut periodically poled Lithium Niobate crystals. The waveguides were fabricated by using a femto-second laser, and utilized for second-harmonic generation. Our experiments have shown that a quasi-phase matching wavelength of 1548.2 nm, a tuning bandwidth of 2 nm, and a tuning temperature range of 150.4±1.6°C can be achieved.
Two simple and low-cost methods for achieving selective filling of air-core photonic bandgap fibers (PBGFs) are
proposed and demonstrated. In the first method, liquid paraffin was filled into a PBGF by capillary force. By a two-step
filling-cleaving process, all cladding air-holes are finally blocked but the air-core remains open. In the second method,
lateral erosion method by hydrofluoric acid was first used to make the cladding air-holes laterally open. Then, the
laterally filled liquid paraffin made all cladding air-holes blocked and left only air-core open. With these two methods,
the central hollow-core of the PBGF can be selectively filled, which allows for the fabrication of novel hybrid
functional-material-silica PBGF for various applications.
Using the plane-wave expansion method and finite element method, we investigate the properties of all-solid square-lattice
photonic bandgap fibers. The comparison of different r/Λ values in the proposed fiber is convenient to optimize
the fiber design. The simulation results demonstrate that the effective mode area of all-solid square-lattice photonic
bandgap fibers is 1.25 times larger than triangular-lattice ones and the confinement loss of the fibers is no more than
0.1dB/m within the selected bandgap.
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