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Interfacing photonic crystal fiber with a metallic nanoantenna for enhanced light nanofocusing

Photonics Research 2021年第2期9卷 252-258页

作者： khant minn BLAKE BIRMINGHAM BRIAN KO HO WAI HOWARD LEE ZHENRONG ZHANG Department of Physics Baylor UniversityWacoTexas 76798USA The Institute for Quantum Science and Engineering Texas A&M UniversityCollege StationTexas 77843USA Department of Physics&Astronomy University of CaliforniaIrvineCalifornia 92697USA Beckman Laser Institute and Medical Clinic University of CaliforniaIrvineCalifornia 92697USA

The direct interfacing of photonic crystal fiber to a metallic nanoantenna has widespread application in nanoscale imaging, optical lithography, nanoscale lasers, quantum communication, in vivo sensing, and medical *** report on the fabrication of a needle-shaped plasmonic nanoantenna on the end facet of a photonic crystal fiber using electron-beam-induced evaporation of platinum. We demonstrate the coupling of light from the fiber waveguide mode to the subwavelength nanoantenna plasmonic mode focusing down to the apex of the plasmonic needle using a polarization-resolved far-field side-scatter imaging technique. Our work provides an important step toward widespread application of optical fibers in nearfield spectroscopic techniques such as tip-enhanced Raman and fluorescence microscopy, single-photon excitation and quantum sensors, nanoscale optical lithography, and lab-on-fiber devices.

关键词： antenna fiber lithography

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Global stability and vaccination of an SEIVR epidemic model with saturated incidence rate

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International Journal of Biomathematics 2016年第5期9卷 59-83页

作者： Muhammad Altaf Khan Yasir Khan Sehra khant Saeed Islam Department of Mathematics Abdul Wall Khan University Mardan Khyber Pakhtunkhwa 23200 Pakistan Department of Mathematics University of Haft Al-Batin Hafr Al-Batin 31991 Saudi Arabia Department of Mathematics Abdul Wali Khan University Mardan Khyber Pakhtunkhwa 23200 Pakistan

This study considers SEIVR epidemic model with generalized nonlinear saturated inci- dence rate in the host population horizontally to estimate local and global equilibriums. By using the Rout^Hurwitz criteria, it is shown that if the basic reproduction number R0 〈 1, the disease-free equilibrium is locally asymptotically stable. When the basic reproduction number exceeds the unity, then the endemic equilibrium exists and is stable locally asymptotically. The system is globally asymptotically stable about the disease-free equilibrium if R0 〈 1. The geometric approach is used to present the global stability of the endemic equilibrium. For R0〉 1, the endemic equilibrium is stable globally asymptotically. Finally, the numerical results are presented to justify the mathematical results.

关键词： Epidemic model reproduction number vaccination global stability Routh- Hurwitz criteria numerical solution.

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