We propose and theoretically study a novel surface-plasmon-resonance sensor based on an H-shaped, elliptical-core
optical fibre. The two grooves of the H-fibre are coated with a thin, uniform metal layer that in turn is covered with a
high-index dielectric layer to allow broad spectral tunability. The sensor maintains linear polarization and facilitates
effortless splicing. Electromagnetic mode analysis indicates a sensitivity of 1800 nm/RIU (refractive-index unit) for
aqueous analytes.
We report on the fabrication of photonic band gap fiber made of multicomponent glass. This fiber has a hexagonal lattice made of an array of 17 x 17 air capillaries with a lattice constant Λ=6.0 μm and air holes of diameter equal to d=5.7 μm. A hollow core is created by omitting seven central microcapillaries and have diameter of 16 μm. Characterization results show that the fiber can guide the light in the visible range with a central wavelength of 510 nm. The transmission properties for the presented PCFs are measured by using a broadband light source and an optical spectrum analyzer. In the paper we discuss also possible future modifications of the structures and their potential applications.
Most works on photonic crystal fibers with a photonic bandgap are concerned with structures made of silica glass with a hexagonal lattice. However, there are many other possible choices for the crystal structure of the fiber. In this paper, we study the optical properties of photonic bandgaps in a hollow-core photonic crystal fiber with a square lattice fabricated from multi-component glass. A composition of oxides was chosen to obtain a refractive index contrast higher than in fused silica fibers. The core size of the fiber is 11 microns and the cladding is made of an array of 17 x 17 air capillaries. A full-vector mode solver using the biorthonormal basis method is employed to analyze the modal properties of the fiber. We verify the guiding properties of the fiber by FDTD simulations. The transmission properties for several lengths of the fiber were measured by using broadband light from a nanosecond-pulse supercontinuum source and an optical spectrum analyzer. Preliminary results show that light is guided around 1650 nm. Possible modifications of the structure and potential applications will be discussed.
The recently invented photonic crystal fibers have brought about new possibilities for novel photonics applications. We describe light sources based on supercontinuum generation in microstructured fibers and use of bandgap fibers for sensor applications.
Recently emerged photonic bandgap fibers with their extraordinary optical properties offer many interesting device applications. We present the status of our work on the use of this kind of a fiber in sensing and wavelength referencing both in the 1300 and 1500 nm wavelength regions. The photonic bandgap fibers are spliced to standard single-mode fibers at input end for easy coupling and filled with gas through the other end placed in a vacuum chamber. The technique is applied to measure absorption lines of strongly absorbing gases such as acetylene and hydrogen cyanide by employing tunable lasers and LEDs as light sources. The measurement of weakly absorbing gases such as methane and ammonia is also explored. To realize a permanent wavelength reference sealing of a photonic bandgap fiber using index-matching UV-curable adhesive is demonstrated.
Responsivity calibrations of trap detectors with a cryogenic absolute radiometer and a power-stabilized 543.51 6-nm He-Ne laser are described. The trap detectors are used as transfer standards of optical power at visible wavelengths because they have a predictable spectral responsivity. New results on transmittance measurements of PRC Krochmann V(λ) filters are presented, especially the angle and temperature dependence of the transmittance. The characterized trap detector and the V(λ) filter are used for a novel realization of the SI base unit of luminous intensity, the candela. Test measurements indicate a good agreement with previous photometric scales.
We report on an experimental study of cold rubidium atoms in a magneto-optical trap. Fluorescent light from the cloud of trapped atoms was collected onto a CCD (charge coupled device) camera. The number density of atoms and the lifetime of the trap are deduced from the recorded CCD images. Special emphasis is given to the calibration of the COD camera.
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