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Recent developments in single-ring hollow-core photonic crystal fibre (SR-PCF) have made possible robust single-mode guidance over a broad bandwidth [1]—an important attribute in many applications, for example high power delivery of laser light and ultrafast gas-based nonlinear optics. Here we report for the first time that these fibres can be designed to transmit just one circular polarisation state...
Nonlinear optics in fibres has for decades been carried out predominantly in step-index glass cores that support just one transverse mode, or if the core supports higher-order modes (HOMs), careful launch alignment is used to minimize their excitation in practice. In gas-filled hollow-core fibres, however, single-mode propagation ceases to be valid at high intensities, even under perfect launch conditions...
A ro-vibrational Raman comb spanning 280 to 1000 nm is generated in a H2/D2-filled anti-resonant-guiding kagomé hollow-core PCF pumped at 532 nm. Addition of xenon produces a dense cluster of >150 side-bands in the visible.
We report fabrication of a microstructured ZBLAN fibre with six cores each containing a nanobore of diameter ∼330 nm. Spectral broadening is observed when pumped by 1042 nm pulses in both fundamental and higher order modes.
We present a novel irradiation sensor based on a fluorescent microparticle that is optically guided inside the core of a liquid-filled photonic crystal fiber. We demonstrate irradiance measurements with spatial resolution of ∼10 μm.
Emission of narrowband pulses down to the VUV (184 nm) is demonstrated in a hydrogen-filled kagomé-PCF pumped at 266 nm. Intermodal Raman scattering facilitates the parametric excitation of short wavelengths in the all-normal dispersion regime.
We investigate spectral correlations generated by high-gain modulational instability in argon-filled hollow-core photonic crystal fiber. Confirming theoretical predictions, with increasing gain we observe a reduction in the number of spectral modes up to the single-mode state.
We report robust guidance of light in coreless photonic crystal fibers that are twisted helically during manufacture. The measured near-field profiles and dispersion of these unusual modes agree well with finite element modeling.
Since their appearance two decades ago, PCFs have triggered a range of unique advances in light-matter interactions, including ultrabroadband supercontinuum generation, enhanced optomechanical nonlinearities, OAM-preserving twisted PCFs and diffraction-free pulse compression and nonlinear frequency conversion in gases.
A more than one-octave-wide supercontinuum (0.9 to ∼2.1 µm) is generated in a double-nanospike As2Se3-silica step-index waveguide. The average supercontinuum spectral intensity is increased by ∼20 dB compared to the previously reported single-spike structure.
The global experimental bifurcation diagram of a passively pumped PCF ring cavity is analyzed. We observe unequal shot-to-shot evolution of different spectral regions of the cavity pulse, and confirm this using two independent measurement techniques.
Vacuum-UV radiation between 145–155 nm is generated from 40 fs, 800 nm 6.8 µJ pump pulses in a 34 µm core-diameter kagomé-PCF filled with 20–25 bar neon. Simulations confirm the mechanism as resonant dispersive-wave emission.
A supercontinuum extending from 125nm to 1200nm is generated in hydrogen-filled kagomé-PCF by means of impulsive Raman self-scattering of few-μJ ultrashort pulses at 805nm. The source shows no optical damage and is stable over time.
A noise-seeded transient Raman frequency comb spanning three octaves from 180 to 2400 nm is generated by pumping a hydrogen-filled hollow-core photonic crystal with 300 fs pulses of energy 26 µJ and wavelength 800 nm.
High-energy, single-mode, coherent, ultrafast pulses of light - tunable from the vacuum-UV to the visible spectral region - can be generated in gas-filled hollow-core photonic-crystal fibers through a simple experimental scheme.
We demonstrate that twisted solid-core PCF develops strongly enhanced optical activity and circular dichroism in the vicinity of orbital angular momentum resonances in the cladding. It may be used as a circular polarizer.
Side-coupling enables the selective excitation of individual higher order modes in hollow-core PCF, permitting the complex near-field modal patterns to be cleanly observed at any wavelength. Modal phase indices and losses can be accurately measured.
Coherent optically-driven GHz acoustic waves, tightly guided in the micron-sized core of photonic crystal fibre, enable reconfigurable dynamic optical isolation and switching, providing new functionality that is useful in various types of all-optical fibre systems.
Localized surface plasmon resonances (LSPRs) are collective oscillations of the electron ensemble in a metallic nanostructure and can be excited by electromagnetic (EM) waves. Their characteristics are determined by the morphology of the nanostructure and the permittivities of the metal and the surrounding dielectric. An intriguing feature of LSPRs is the local EM field enhancement, resulting in strong...
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