The Experts below are selected from a list of 21471 Experts worldwide ranked by ideXlab platform

Markus A Schmidt - One of the best experts on this subject based on the ideXlab platform.

  • hybrid optical Fibers an innovative platform for in Fiber photonic devices
    Advanced Optical Materials, 2016
    Co-Authors: Markus A Schmidt, Alexander Argyros, Fabien Sorin
    Abstract:

    The field of hybrid optical Fibers is one of the most active research areas in current Fiber Optics and has the vision of integrating sophisticated materials inside Fibers, which are not traditionally used in Fiber Optics. Novel in-Fiber devices with unique properties have been developed, opening up new directions for Fiber Optics in fields of critical interest in modern research, such as biophotonics, environmental science, optoelectronics, metamaterials, remote sensing, medicine, or quantum Optics. Here the recent progress in the field of hybrid optical Fibers is reviewed from an application perspective, focusing on Fiber-integrated devices enabled by including novel materials inside polymer and glass Fibers. The topics discussed range from nanowire-based plasmonics and hyperlenses, to integrated semiconductor devices such as optoelectronic detectors, and intense light generation unlocked by highly nonlinear hybrid waveguides.

Jianzhi Dong - One of the best experts on this subject based on the ideXlab platform.

  • the impacts of heating strategy on soil moisture estimation using actively heated Fiber Optics
    Sensors, 2017
    Co-Authors: Jianzhi Dong, Rosa Agliata, S C Steeledunne, Olivier Hoes, Thom Bogaard, Roberto Greco, Nick Van De Giesen
    Abstract:

    Several recent studies have highlighted the potential of Actively Heated Fiber Optics (AHFO) for high resolution soil moisture mapping. In AHFO, the soil moisture can be calculated from the cumulative temperature ( T cum ), the maximum temperature ( T max ), or the soil thermal conductivity determined from the cooling phase after heating ( λ ). This study investigates the performance of the T cum , T max and λ methods for different heating strategies, i.e., differences in the duration and input power of the applied heat pulse. The aim is to compare the three approaches and to determine which is best suited to field applications where the power supply is limited. Results show that increasing the input power of the heat pulses makes it easier to differentiate between dry and wet soil conditions, which leads to an improved accuracy. Results suggest that if the power supply is limited, the heating strength is insufficient for the λ method to yield accurate estimates. Generally, the T cum and T max methods have similar accuracy. If the input power is limited, increasing the heat pulse duration can improve the accuracy of the AHFO method for both of these techniques. In particular, extending the heating duration can significantly increase the sensitivity of T cum to soil moisture. Hence, the T cum method is recommended when the input power is limited. Finally, results also show that up to 50% of the cable temperature change during the heat pulse can be attributed to soil background temperature, i.e., soil temperature changed by the net solar radiation. A method is proposed to correct this background temperature change. Without correction, soil moisture information can be completely masked by the background temperature error.

Ulf Leonhardt - One of the best experts on this subject based on the ideXlab platform.

  • observation of stimulated hawking radiation in an optical analogue
    Physical Review Letters, 2019
    Co-Authors: Jonathan Drori, Yuval Rosenberg, David Bermudez, Yaron Silberberg, Ulf Leonhardt
    Abstract:

    : The theory of Hawking radiation can be tested in laboratory analogues of black holes. We use light pulses in nonlinear Fiber Optics to establish artificial event horizons. Each pulse generates a moving perturbation of the refractive index via the Kerr effect. Probe light perceives this as an event horizon when its group velocity, slowed down by the perturbation, matches the speed of the pulse. We have observed in our experiment that the probe stimulates Hawking radiation, which occurs in a regime of extreme nonlinear Fiber Optics where positive and negative frequencies mix.

Fabien Sorin - One of the best experts on this subject based on the ideXlab platform.

  • hybrid optical Fibers an innovative platform for in Fiber photonic devices
    Advanced Optical Materials, 2016
    Co-Authors: Markus A Schmidt, Alexander Argyros, Fabien Sorin
    Abstract:

    The field of hybrid optical Fibers is one of the most active research areas in current Fiber Optics and has the vision of integrating sophisticated materials inside Fibers, which are not traditionally used in Fiber Optics. Novel in-Fiber devices with unique properties have been developed, opening up new directions for Fiber Optics in fields of critical interest in modern research, such as biophotonics, environmental science, optoelectronics, metamaterials, remote sensing, medicine, or quantum Optics. Here the recent progress in the field of hybrid optical Fibers is reviewed from an application perspective, focusing on Fiber-integrated devices enabled by including novel materials inside polymer and glass Fibers. The topics discussed range from nanowire-based plasmonics and hyperlenses, to integrated semiconductor devices such as optoelectronic detectors, and intense light generation unlocked by highly nonlinear hybrid waveguides.

Frank W. Wise - One of the best experts on this subject based on the ideXlab platform.

  • Multimode Nonlinear Fiber Optics: Massively Parallel Numerical Solver, Tutorial, and Outlook
    IEEE Journal of Selected Topics in Quantum Electronics, 2018
    Co-Authors: Logan G Wright, Zachary M. Ziegler, Zimu Zhu, Amin M. Eftekhar, Pavel M. Lushnikov, Demetrios N Christodoulides, Frank W. Wise
    Abstract:

    Building on the scientific understanding and technological infrastructure of single-mode Fibers, multimode Fibers are being explored as a means of adding new degrees of freedom to optical technologies such as telecommunications, Fiber lasers, imaging, and measurement. Here, starting from a baseline of single-mode nonlinear Fiber Optics, we introduce the growing topic of multimode nonlinear Fiber Optics. We demonstrate a new numerical solution method for the system of equations that describes nonlinear multimode propagation, the generalized multimode nonlinear Schrödinger equation. This numerical solver is freely available, implemented in MATLAB and includes a number of multimode Fiber analysis tools. It features a significant parallel computing speed-up on modern graphical processing units, translating to orders-of-magnitude speed-up over the conventionally-used split-step Fourier method. We demonstrate its use with several examples in graded- and step-index multimode Fibers. Finally, we discuss several key open directions and questions, whose answers could have significant scientific and technological impact.