Browsing by Author "Hossen, Md. Nazmul"

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    Design and analysis of biosensor based on surface plasmon resonance
    (Elsevier B.V., 2018-08-08) Hossen, Md. Nazmul; Ferdous, Md.; Khalek, Md.Abdul; Chakma, Sujan; Paul, Bikash Kumar; Ahmed, Kawsar
    A photonic crystal fiber (PCF) biosensor based on surface plasmon resonance (SPR) is to obtain maximum sensitivity for the detection of unknown analytes. Chemically stable and inactive plasmonic material gold (Au) is used outside of the PCF structure. To evaluate the performance of the sensor, a perfectly match layer (PML) is also added for diminishing the unwanted nonphysical radiation. The proposed sensor is consisting of double layer symmetrical square air holes. A small air hole in the center is used to produce the more evanescent field. Sensing performance is numerically investigated by the finite element method (FEM) based on commercially available tools COMSOL Multiphysics. The maximum amplitude sensitivity of this proposed sensor is 442.11 RIU−1 with the highest sensor resolution 1.66 × 10−5 using amplitude integration method. The wavelength sensitivity is 6000 nm/RIU using amplitude integration method. The proposed sensor is widely applicable in bio-photonics applications.
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    Low Insertion Loss and High Extinction Ratio Analysis of a New Surface Plasmon Resonance Based Photonic Crystal Fiber Filter
    (Optik, Elsevier GmbH, 2019) Ahmed, Kawsar; Ferdous, Md.; Hossen, Md. Nazmul; Paul, Bikash Kumar; Amiri, I.S.; Yupapin, P.
    A new photonic crystal fiber (PCF) filter based on surface plasmon resonance (SPR) is proposed for 1.2 μm–1.55 μm operating wavelength. Surface plasmon resonance just takes place in the x-polarization axis owing to birefringence and gold-coated nano-film is used as plasmonic material. The significance of structural parameters and resonance potency of the surface plasmon mode of the proposed SPR PCF are calculated by the finite-element-method (FEM). However, the loss profile of the x-axis polarization mode is greater because of its gold coated air hole is in the positive x-direction. Moreover, the proposed PCF is suitable for polarization filter and communication. In x-polarization mode, the proposed PCF filter has lofty extinction ratio and low insertion loss which is 0.06 dB.
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    Single Polarization Photonic Crystal Fiber Filter Based on Surface Plasmon Resonance
    (Frontiers of Optoelectronics, Springer, 2018-10-24) Hossen, Md. Nazmul; Ferdous, Md.; Ahmed, Kawsar; Khalek, Md. Abdul; Chakma, Sujan; Paul, Bikash Kumar
    In this paper, we propose a photonic crystal fiber (PCF) polarization filter based on surface plasmon resonance (SPR) characteristics. Gold nanowire is used as the active plasmonic material. Light into silica core becomes coupled to gold nanowire stimulating SPR. It splits light into two orthogonal (x-polarization and y-polarization) polarization in the second order of surface plasmon polarization. Numerical investigations of the proposed PCF filter is finite element method (FEM). By tuning the diameter of gold nanowire and shifting their position, the performance of the proposed PCF filter is inspected rigorously. Filtering of any polarization can be obtained by properly placing the metal wires. The maximum confinement loss of x-polarization is 692.25 dB/cm and y-polarization is 1.13 dB/cm offers at resonance position 1.42 μm. Such a confinement loss difference between two orthogonal polarizations makes PCF a talented candidate to filter devices. Consequently, the recommended PCF structure is useful for polarization device.