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| 1 | Analytical formulation for the bend loss in single-ring hollow-core photonic crystal fibers显示文摘Understanding bend loss in single-ring hollow-core photonic crystal fibers(PCFs)is becoming of increasing importance as the fibers enter practical applications.While purely numerical approaches are useful,there is a need for a simpler analytical formalism that provides physical insight and can be directly used in the design of PCFs with low bend loss.We show theoretically and experimentally that a wavelength-dependent critical bend radius exists below which the bend loss reaches a maximum,and that this can be calculated from the structural parameters of a fiber using a simple analytical formula.This allows straightforward design of single-ring PCFs that are bend-insensitive for specified ranges of bend radius and wavelength.It also can be used to derive an expression for the bend radius that yields optimal higher-order mode suppression for a given fiber structure. | MICHAEL H.FROSZ PAUL ROTH MEHMET C.GüNENDI PHILIP ST.J.RUSSELL | 2017 | Photonics Research2017，5，2： | 5 |
| 2 | Broadband mid-infrared supercontinuum generation in dispersion-engineered As_(2)S_(3)-silica nanospike waveguides pumped by 2.8 μm femtosecond laser显示文摘Broadband mid-infrared(IR)supercontinuum laser sources are essential for spectroscopy in the molecular fingerprint region.Here,we report generation of octave-spanning and coherent mid-IR supercontinua in As_(2)S_(3)-silica nanospike hybrid waveguides pumped by a custom-built 2.8μm femtosecond fiber laser.The waveguides are formed by pressure-assisted melt-filling of molten As_(2)S_(3) into silica capillaries,allowing the dispersion and nonlinearity to be precisely tailored.Continuous coherent spectra spanning from 1.1μm to 4.8μm(30 dB level)are observed when the waveguide is designed so that 2.8μm lies in the anomalous dispersion regime.Moreover,linearly tapered millimeter-scale As_(2)S_(3)-silica waveguides are fabricated and investigated for the first time,to the best of our knowledge,showing much broader supercontinua than uniform waveguides,with improved spectral coherence.The waveguides are demonstrated to be long-term stable and water-resistant due to the shielding of the As_(2)S_(3) by the fused silica sheath.They offer an alternative route to generating broadband mid-IR supercontinua,with applications in frequency metrology and molecular spectroscopy,especially in humid and aqueous environments. | Pan Wang Jiapeng Huang Shangran Xie Johann Troles and Philip St.J.Russell | 2021 | Photonics Research2021，9，4： | 4 |
| 3 | Long-range optical trapping and binding of microparticles in hollow-core photonic crystal fibre显示文摘Optically levitated micro-and nanoparticles offer an ideal playground for investigating photon–phonon interactions over macroscopic distances.Here we report the observation of long-range optical binding of multiple levitated microparticles,mediated by intermodal scattering and interference inside the evacuated core of a hollow-core photonic crystal fibre(HC-PCF).Three polystyrene particles with a diameter of 1μm are stably bound together with an inter-particle distance of~40μm,or 50 times longer than the wavelength of the trapping laser.The levitated boundparticle array can be translated to-and-fro over centimetre distances along the fibre.When evacuated to a gas pressure of 6 mbar,the collective mechanical modes of the bound-particle array are able to be observed.The measured interparticle distance at equilibrium and mechanical eigenfrequencies are supported by a novel analytical formalism modelling the dynamics of the binding process.The HC-PCF system offers a unique platform for investigating the rich optomechanical dynamics of arrays of levitated particles in a well-isolated and protected environment. | Dmitry S.Bykov Shangran Xie Richard Zeltner Andrey Machnev Gordon K.L.Wong Tijmen G.Euser Philip St.J.Russell | 2018 | Light(Science & Applications)2018，7，1： | 3 |
| 4 | High-quality 8-fold self-compression of ultrashort near-UV pulses in an Ar-filled ultrathin-walled photonic crystal fiber显示文摘We demonstrate generation of 7.6 fs near-UV pulses centered at 400 nm via 8-fold soliton-effect self-compression in an Ar-filled hollow-core kagomé-style photonic crystal fiber with ultrathin core walls.Analytical calculations of the effective compression length and soliton order permit adjustment of the experimental parameters,and numerical modeling of the nonlinear pulse dynamics in the fiber accurately predicts the spectrotemporal profiles of the self-compressed pulses.After compensation of phase distortion introduced by the optical elements along the beam path from the fiber to the diagnostics,71%of the pulse energy was in the main temporal lobe,with peak powers in excess of 0.2 GW.The convenient setup opens up new opportunities for time-resolved studies in spectroscopy,chemistry,and materials science. | JIE LUAN PHILIP ST.J.RUSSELL DAVID NOVOA | 2022 | Photonics Research2022，10，10： | 0 |
| 5 | Optomechanical cooling and self-stabilization of a waveguide coupled to a whispering-gallery-mode resonator显示文摘Laser cooling of mechanical degrees of freedom is one of the most significant achievements in the field of opto-mechanics.Here,we report,for the first time to the best of our knowledge,efficient passive optomechanical cooling of the motion of a freestanding waveguide coupled to a whispering gallery-mode(WGM)resonator.The waveguide is an 8 mm long glass-fiber nanospike,which has a fundamental flexural resonance atΩ/2π=2.5 kHz and a Q-factor of 1.2×10^5.Upon launching^250μW laser power at an optical frequency close to the WGM resonant frequency,we observed cooling of the nanospike resonance from room temperature down to 1.8 K.Simultaneous cooling of the first higher-order mechanical mode is also observed.The strong suppression of the overall Brownian motion of the nanospike,observed as an 11.6 dB reduction in its mean square displacement,indicates strong optomechanical stabilization of linear coupling between the nanospike and the cavity mode.The cooling is caused predominantly by a combination of photothermal effects and optical forces between nanospike and WGM resonator.The results are of direct relevance in the many applications of WGM resonators,including atom physics,optomechanics,and sensing. | RICCARDO PENNETTA SHANGRAN XIE RICHARD ZELTNER JONAS HAMMER PHILIP ST.J.RUSSELL | 2020 | Photonics Research2020，8，6： | 0 |
| 6 | Stimulated Brillouin scattering in chiral photonic crystal fiber显示文摘Stimulated Brillouin scattering(SBS)has many applications;for example,in sensing,microwave photonics,and signal processing.Here,we report the first experimental study of SBS in chiral photonic crystal fiber(PCF),which displays optical activity and robustly maintains circular polarization states against external perturbations.As a result,circularly polarized pump light is cleanly backscattered into a Stokes signal with the orthogonal circular polarization state,as is required by angular momentum conservation.By comparison,untwisted PCF generates a Stokes signal with an unpredictable polarization state,owing to its high sensitivity to external perturbations.We use chiral PCF to realize a circularly polarized continuous-wave Brillouin laser.The results pave the way for a new generation of stable circularly polarized SBS systems with applications in quantum manipulation,optical tweezers,optical gyroscopes,and fiber sensors. | Xinglin Zeng Wenbin He Michael HFrosz Andreas Geilen Paul Roth Gordon K.L.Wong Philip St.J.Russell Birgit Stiller | 2022 | Photonics Research2022，10，3： | 0 |
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