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This book is intended to provide an overview of the state-of-the-art in specialty photonic crystal fiber technology and its multiple applications, combined with an optimistic outlook to what lies ahead. It comprises six original research papers and one review from different leading research institutions worldwide.

Research & information: general --- stimulated Raman scattering --- hollow-core photonic crystal fibers --- fiber lasers --- gas lasers --- hollow-core photonic crystal fiber --- soliton --- photoionization --- dispersive wave --- chalcogenide glasses --- 3D printing --- mid-infrared fibers --- photonic crystal fibers --- photonic bandgap fiber --- resonance --- dispersion management --- supercontinuum generation --- photonic crystal fiber --- polarization modulation instability --- ANDi fiber --- liquid-filled PCF --- hollow core fiber --- optical waveguide design --- mid-infrared beam delivery --- hollow-core fiber --- fiber gas laser --- n/a

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The possibility of guiding light in air has fascinated optical scientists and engineers since the dawn of optical fiber technology. In the last few years, hollow core optical fibers have been attracting the attention of an expanding worldwide research community, furthering the design, fabrication and device implementation of specialty optical fibers. Hollow core optical fibers are entering almost any specific application field of optics from medicine to security; from telecommunication to industrial processing; from instrumentation to biology. In parallel to the increased number of applications, major advances are still being made on the optimization of hollow core fiber designs and on the study of its underlying guiding properties, as well as in the use of different materials and fabrication techniques, which, in turn, are providing even more ways of exploitation of this technology and new technical challenges. This Special Issue of Fibers rides the wave of this increasing interest in the field of hollow core optical fibers by providing an overview of the recent progress in this field as well as an updated and indicative sample of current research activities worldwide.

fiber filters --- n/a --- addictive manufacturing --- microstructured optical fiber splicing --- hollow core fibers --- THz --- hollow core fiber --- negative curvature fibers --- beam delivery --- fiber loss --- CO2 lasers --- fiber design and fabrication --- optical fiber --- ultrafast lasers --- chalcogenide glass --- waveguide --- multiphoton fluorescence spectroscopy --- gas photonics --- fabrication --- hollow-core antiresonant fiber --- photonic crystal fibers --- anti-resonant fibers --- hollow-core photonic crystal fiber --- microstructured optical fibers --- carbon dioxide laser --- fiber optics --- microstructured fibers --- hollow optical fiber --- endoscopic laser applications --- terahertz --- optical fiber sensors --- mid-IR --- anti-resonant --- hollow-core fibers --- modal fiber properties --- 3D printing --- Raman lasers --- numerical modeling

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Sonic/phononic crystals termed acoustic/sonic band gap media are elastic analogues of photonic crystals and have also recently received renewed attention in many acoustic applications. Photonic crystals have a periodic dielectric modulation with a spatial scale on the order of the optical wavelength. The design and optimization of photonic crystals can be utilized in many applications by combining factors related to the combinations of intermixing materials, lattice symmetry, lattice constant, filling factor, shape of the scattering object, and thickness of a structural layer. Through the publications and discussions of the research on sonic/phononic crystals, researchers can obtain effective and valuable results and improve their future development in related fields. Devices based on these crystals can be utilized in mechanical and physical applications and can also be designed for novel applications as based on the investigations in this Special Issue.

History of engineering & technology --- optical force --- photonic crystal cavity --- particle trapping --- optomechanical sensing --- polarization converter --- photonic crystal fiber --- square lattice --- extinction ratio --- polarization splitter --- dual-core photonic crystal fiber --- coupling characteristics --- phononic crystal --- auxetic structure --- star-shaped honeycomb structure --- wave propagation --- orbital angular momentum --- modal dispersion --- stress-induced birefringence --- finite element method --- mode-division multiplexing --- Erbium-doped fiber amplifier --- photonic crystal fibers --- cylindrical lens --- photonic nanojet --- graded-index --- vibration energy harvester --- defect bands --- piezoelectric material --- magnetostrictive material --- output voltage and power --- locally resonant --- band gap --- differential quadrature method --- direct laser writing --- KTP --- nonlinear optics --- photonic coupling --- energy harvesting --- defect modes --- phononic crystals (PCs) --- colloidal photonic crystals --- tunable photonic band gaps --- anti-counterfeiting --- coupled elastic waves --- laminated piezoelectric phononic crystals --- arbitrarily anisotropic materials --- band tunability --- electrical boundaries --- dispersion curves --- photonic crystals --- photonic bandgaps --- polymer materials --- acoustic metamaterial --- effective medium --- bubble resonance --- negative modulus --- graphene --- kerr effect --- optical switch --- photonic band gap --- photonic crystal --- microwave photonics --- optical frequency combs --- waveguide --- complete PBG --- PDOS --- TE --- TM --- beam shaping --- angular filtering --- autocloning --- multilayered structures --- sensor --- sensitivity --- figure of merit --- n/a

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Sonic/phononic crystals termed acoustic/sonic band gap media are elastic analogues of photonic crystals and have also recently received renewed attention in many acoustic applications. Photonic crystals have a periodic dielectric modulation with a spatial scale on the order of the optical wavelength. The design and optimization of photonic crystals can be utilized in many applications by combining factors related to the combinations of intermixing materials, lattice symmetry, lattice constant, filling factor, shape of the scattering object, and thickness of a structural layer. Through the publications and discussions of the research on sonic/phononic crystals, researchers can obtain effective and valuable results and improve their future development in related fields. Devices based on these crystals can be utilized in mechanical and physical applications and can also be designed for novel applications as based on the investigations in this Special Issue.

History of engineering & technology --- optical force --- photonic crystal cavity --- particle trapping --- optomechanical sensing --- polarization converter --- photonic crystal fiber --- square lattice --- extinction ratio --- polarization splitter --- dual-core photonic crystal fiber --- coupling characteristics --- phononic crystal --- auxetic structure --- star-shaped honeycomb structure --- wave propagation --- orbital angular momentum --- modal dispersion --- stress-induced birefringence --- finite element method --- mode-division multiplexing --- Erbium-doped fiber amplifier --- photonic crystal fibers --- cylindrical lens --- photonic nanojet --- graded-index --- vibration energy harvester --- defect bands --- piezoelectric material --- magnetostrictive material --- output voltage and power --- locally resonant --- band gap --- differential quadrature method --- direct laser writing --- KTP --- nonlinear optics --- photonic coupling --- energy harvesting --- defect modes --- phononic crystals (PCs) --- colloidal photonic crystals --- tunable photonic band gaps --- anti-counterfeiting --- coupled elastic waves --- laminated piezoelectric phononic crystals --- arbitrarily anisotropic materials --- band tunability --- electrical boundaries --- dispersion curves --- photonic crystals --- photonic bandgaps --- polymer materials --- acoustic metamaterial --- effective medium --- bubble resonance --- negative modulus --- graphene --- kerr effect --- optical switch --- photonic band gap --- photonic crystal --- microwave photonics --- optical frequency combs --- waveguide --- complete PBG --- PDOS --- TE --- TM --- beam shaping --- angular filtering --- autocloning --- multilayered structures --- sensor --- sensitivity --- figure of merit --- n/a

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• Reference Manager
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Sonic/phononic crystals termed acoustic/sonic band gap media are elastic analogues of photonic crystals and have also recently received renewed attention in many acoustic applications. Photonic crystals have a periodic dielectric modulation with a spatial scale on the order of the optical wavelength. The design and optimization of photonic crystals can be utilized in many applications by combining factors related to the combinations of intermixing materials, lattice symmetry, lattice constant, filling factor, shape of the scattering object, and thickness of a structural layer. Through the publications and discussions of the research on sonic/phononic crystals, researchers can obtain effective and valuable results and improve their future development in related fields. Devices based on these crystals can be utilized in mechanical and physical applications and can also be designed for novel applications as based on the investigations in this Special Issue.

optical force --- photonic crystal cavity --- particle trapping --- optomechanical sensing --- polarization converter --- photonic crystal fiber --- square lattice --- extinction ratio --- polarization splitter --- dual-core photonic crystal fiber --- coupling characteristics --- phononic crystal --- auxetic structure --- star-shaped honeycomb structure --- wave propagation --- orbital angular momentum --- modal dispersion --- stress-induced birefringence --- finite element method --- mode-division multiplexing --- Erbium-doped fiber amplifier --- photonic crystal fibers --- cylindrical lens --- photonic nanojet --- graded-index --- vibration energy harvester --- defect bands --- piezoelectric material --- magnetostrictive material --- output voltage and power --- locally resonant --- band gap --- differential quadrature method --- direct laser writing --- KTP --- nonlinear optics --- photonic coupling --- energy harvesting --- defect modes --- phononic crystals (PCs) --- colloidal photonic crystals --- tunable photonic band gaps --- anti-counterfeiting --- coupled elastic waves --- laminated piezoelectric phononic crystals --- arbitrarily anisotropic materials --- band tunability --- electrical boundaries --- dispersion curves --- photonic crystals --- photonic bandgaps --- polymer materials --- acoustic metamaterial --- effective medium --- bubble resonance --- negative modulus --- graphene --- kerr effect --- optical switch --- photonic band gap --- photonic crystal --- microwave photonics --- optical frequency combs --- waveguide --- complete PBG --- PDOS --- TE --- TM --- beam shaping --- angular filtering --- autocloning --- multilayered structures --- sensor --- sensitivity --- figure of merit --- n/a