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We derive solutions for radially polarized Bessel-Gauss beams in ABCD optical systems by superimposing decentered Gaussian beams with linear polarization states. We experimentally confirm the expression by employing a fiber-based mode-converter.
We demonstrate vortex generation in a PCF, enabled by a micro-bend grating produced by structural deformations alone. The grating-resonance is stable at temperatures exceeding 1000 C, yielding a platform for realizing ultra-high-temperature sensors.
We replace the air around tapered silica fibres or within hollow-core photonic crystal fibres with silica aerogel. This retains the important device characteristics, including gas permeability, but adds protection and enables new devices.
We demonstrate the insertion of a micromirror into the core of a hollow core photonic crystal fiber (HC-PCF). The micromirror is formed from a single mode fiber that has been tapered to fit into the hollow core and fixed in place using a fusion splicer. A large range of reflectivities higher than 4% was also achieved by silver-coating the silica tapered-fiber end-face using thermal evaporation. The...
Silica aerogel is a very light and highly porous form of silica glass, with densities and refractive indices much lower than those of ordinary solids. We describe optical interactions with aerogel surrounding tapered fibres or inside the holes of photonic crystal fibres. This enables a new class of fibre devices exploiting the properties of the aerogel as a rigid yet porous replacement for air, as...
Tapered fibres with waist diameters down to 0.7 µm embedded in hydrophobic aerogel are demonstrated as evanescent-field gas sensors. The porous aerogel is permeable to gases but protects the sub-micron fibre from contamination and damage.
Ultra-high reflectivity is achieved at the end-face of a hollow-core PCF via the insertion and fusion of a metal-coated tapered single-mode-fiber to the core of the hollow fiber. Saturable absorption is demonstrated using this device.
We fabricated low insertion loss and large core (40 – 70 µm) kagomé lattice acetylene-filled photonic microcells by tapering the large outer diameter kagomé fibers and splicing their reduced ends to a single mode fiber.
We demonstrate spectral broadening in tapered optical fibres embedded in silica aerogel. The aerogel provides protection to the taper without noticeably affecting the refractive and dispersive properties or power handling.
Fused fibre couplers were encapsulated in hydrophobic aerogel. This provides an epoxy-free all-silica package that is low-loss, waterproof, supports the whole coupler waist and is stable up to 250 °C.
We have developed a new technique to incorporate gold nanoparticles into silica aerogel without aggregation. Such a doped “plasmonic” aerogel can be used for nonlinear optical experiments and plasmonic sensing.
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