The Experts below are selected from a list of 603 Experts worldwide ranked by ideXlab platform

Ole Bang - One of the best experts on this subject based on the ideXlab platform.

  • Broadband terahertz Fiber Directional Coupler
    Optics letters, 2010
    Co-Authors: Kristian Nielsen, Henrik Koblitz Rasmussen, Peter Uhd Jepsen, Ole Bang
    Abstract:

    We present the design of a short broadband Fiber Directional Coupler for terahertz (THz) radiation and demonstrate a 3dB Coupler with a bandwidth of 0.6THz centered at 1.4THz. The broadband coupling is achieved by mechanically downdoping the cores of a dual-core photonic crystal Fiber by microstructuring the cores. This is equivalent to chemical downdoping but is easier to realize experimentally.

Boris T. Kuhlmey - One of the best experts on this subject based on the ideXlab platform.

  • Refractive index sensor based on a polymer Fiber Directional Coupler for low index sensing.
    Optics express, 2014
    Co-Authors: Kwang Jo Lee, Xiaoqi Liu, Nelly Vuillemin, Richard Lwin, Sergio G. Leon-saval, Alexander Argyros, Boris T. Kuhlmey
    Abstract:

    We propose, numerically analyze and experimentally demonstrate a novel refractive index sensor specialized for low index sensing. The device is based on a Directional Coupler architecture implemented in a single microstructured polymer optical Fiber incorporating two waveguides within it: a single-mode core and a satellite waveguide consisting of a hollow high-index ring. This hollow channel is filled with fluid and the refractive index of the fluid is detected through changes to the wavelength at which resonant coupling occurs between the two waveguides. The sensor design was optimized for both higher sensitivity and lower detection limit, with simulations and experiments demonstrating a sensitivity exceeding 1.4 × 103 nm per refractive index unit. Simulations indicate a detection limit of ~2 × 10−6 refractive index units is achievable. We also numerically investigate the performance for refractive index changes localized at the surface of the holes, a case of particular importance for biosensing.

Euan Smith - One of the best experts on this subject based on the ideXlab platform.

  • Highly nonlinear GeS 2 -based chalcohalide glass for all-optical twin-core-Fiber switching
    Journal of The Optical Society of America B-optical Physics, 1998
    Co-Authors: D. Marchese, M. De Sario, Euan Smith
    Abstract:

    A new GeS2-based chalcohalide glass was synthesized by the melt-quenching technique for nonlinear optical applications. A large glass-forming region was defined, and a wide infrared transmission was measured. Marked optical third-order nonlinearity was measured (n2≈7.5×10-5 cm2/GW), making this glass one of the best candidates for ultrafast nonlinear optical applications. All-optical switching in the second telecommunication window (λ=1.31 μm) by control of the optical pulse intensity in a twin-core-Fiber Directional Coupler was numerically modeled, and a crossover length of 9.25 mm was calculated.

Kristian Nielsen - One of the best experts on this subject based on the ideXlab platform.

  • Broadband terahertz Fiber Directional Coupler
    Optics letters, 2010
    Co-Authors: Kristian Nielsen, Henrik Koblitz Rasmussen, Peter Uhd Jepsen, Ole Bang
    Abstract:

    We present the design of a short broadband Fiber Directional Coupler for terahertz (THz) radiation and demonstrate a 3dB Coupler with a bandwidth of 0.6THz centered at 1.4THz. The broadband coupling is achieved by mechanically downdoping the cores of a dual-core photonic crystal Fiber by microstructuring the cores. This is equivalent to chemical downdoping but is easier to realize experimentally.

Libo Yuan - One of the best experts on this subject based on the ideXlab platform.

  • High sensitivity humidity sensor based on gelatin coated side-polished in-Fiber Directional Coupler
    Sensors and Actuators B: Chemical, 2020
    Co-Authors: Jing Yang, Chunying Guan, Min Yang, Jinhui Shi, Pengfei Wang, Jun Yang, Libo Yuan
    Abstract:

    Abstract We demonstrate the first experimental realization of in-Fiber Directional Coupler-based relative humidity (RH) sensor. A segment of single eccentric hole-assistant dual-core Fiber (SEHADCF) is directly spliced between two single mode Fibers (SMFs) to realize an in-Fiber Directional Coupler (IFDC), and the suspended core of the SEHADCF is exposed to the external environment by using the side-polishing process. Gelatin is covered on the exposed suspended core to form the cladding of the suspended core and acts as a humidity sensitive material. Compared to the previous literatures, we report the highest sensitivity of the RH sensor to our best knowledge. In the RH range of 70 %–90 %, the average and maximum RH sensitivities are −7.005 nm/%RH and −18.94 nm/%RH, respectively. In addition, the temperature response and stability of the IFDC is also experimentally measured. Due to the super-high sensitivity and low temperature crosstalk, the proposed sensor will be expected to be a promising candidate for highly sensitive RH sensing applications in high humidity environment.