We demonstrate a method of generating a multiwavelength Brillouin/Erbium fiber laser in a ring ca... more We demonstrate a method of generating a multiwavelength Brillouin/Erbium fiber laser in a ring cavity, with stimulated Brillouin scattering as a mirror. All Four generated Stokes lines have peak powers above 0 dBm with equal spacing of 10 GHz (0.08 nm) at 130 mW pump power from a 1480 nm laser diode. Our technique suppresses other potential modes to circulate
A simple multi-core flat fiber (MCFF) based surface plasmon resonance (SPR) sensor operating in t... more A simple multi-core flat fiber (MCFF) based surface plasmon resonance (SPR) sensor operating in telecommunication wavelengths is proposed for refractive index sensing. Chemically stable gold (Au) and titanium dioxide (TiO<sub>2</sub>) layers are used outside the fiber structure to realize a simple detection mechanism. The modeled sensor shows average wavelength interrogation sensitivity of 9,600 nm/RIU (Refractive Index Unit) and maximum sensitivity of 23,000 nm/RIU in the sensing range of 1.46-1.485 and 1.47-1.475, respectively. Moreover, the refractive index resolution of 4.35 × 10<sup>-6</sup> is demonstrated. Additionally, proposed sensor had shown the maximum amplitude interrogation sensitivity of 820 RIU<sup>-1</sup>, with the sensor resolution of 1.22 × 10<sup>-5</sup> RIU. To the best of our knowledge, the proposed sensor achieved the highest wavelength interrogation sensitivity among the reported fiber based SPR sensors. Finally we anticipate that, this novel and highly sensitive MCFF SPR sensor will find the potential applications in real time remote sensing and monitoring, ultimately enabling inexpensive and accurate chemical and biochemical analytes detection.
Abstract Under repeated deformation, the mechanical properties of polydimethylsiloxane (PDMS) ela... more Abstract Under repeated deformation, the mechanical properties of polydimethylsiloxane (PDMS) elastomer evolve. This paper aims to investigate the effect of curing agent concentration on the mechanical response of PDMS elastomer under cyclic compressive loading. PDMS elastomer samples containing various curing agent concentrations were prepared following ASTM D575 standard. Three different curing agent concentrations were investigated: 6.25, 9.09 and 16.67 wt%. Monotonic compressive test up to failure and 100 cycles of cyclic compressive test were performed using Instron 3369 50 kN dual column testing machine at a constant crosshead displacement rate of 12 mm/min. It was found that the compressive modulus increases with the curing agent concentration. The effects of cyclic compression on strain hardening, compressive modulus, and creep were also investigated. Results showed that cyclic compression contributes to the stabilization of the materials. Moreover, the number of cycles required to reach strain hardening stabilization decreases as the curing agent concentration increases.
We demonstrate a method of generating a multiwavelength Brillouin/Erbium fiber laser in a ring ca... more We demonstrate a method of generating a multiwavelength Brillouin/Erbium fiber laser in a ring cavity, with stimulated Brillouin scattering as a mirror. All Four generated Stokes lines have peak powers above 0 dBm with equal spacing of 10 GHz (0.08 nm) at 130 mW pump power from a 1480 nm laser diode. Our technique suppresses other potential modes to circulate
A simple multi-core flat fiber (MCFF) based surface plasmon resonance (SPR) sensor operating in t... more A simple multi-core flat fiber (MCFF) based surface plasmon resonance (SPR) sensor operating in telecommunication wavelengths is proposed for refractive index sensing. Chemically stable gold (Au) and titanium dioxide (TiO<sub>2</sub>) layers are used outside the fiber structure to realize a simple detection mechanism. The modeled sensor shows average wavelength interrogation sensitivity of 9,600 nm/RIU (Refractive Index Unit) and maximum sensitivity of 23,000 nm/RIU in the sensing range of 1.46-1.485 and 1.47-1.475, respectively. Moreover, the refractive index resolution of 4.35 × 10<sup>-6</sup> is demonstrated. Additionally, proposed sensor had shown the maximum amplitude interrogation sensitivity of 820 RIU<sup>-1</sup>, with the sensor resolution of 1.22 × 10<sup>-5</sup> RIU. To the best of our knowledge, the proposed sensor achieved the highest wavelength interrogation sensitivity among the reported fiber based SPR sensors. Finally we anticipate that, this novel and highly sensitive MCFF SPR sensor will find the potential applications in real time remote sensing and monitoring, ultimately enabling inexpensive and accurate chemical and biochemical analytes detection.
Abstract Under repeated deformation, the mechanical properties of polydimethylsiloxane (PDMS) ela... more Abstract Under repeated deformation, the mechanical properties of polydimethylsiloxane (PDMS) elastomer evolve. This paper aims to investigate the effect of curing agent concentration on the mechanical response of PDMS elastomer under cyclic compressive loading. PDMS elastomer samples containing various curing agent concentrations were prepared following ASTM D575 standard. Three different curing agent concentrations were investigated: 6.25, 9.09 and 16.67 wt%. Monotonic compressive test up to failure and 100 cycles of cyclic compressive test were performed using Instron 3369 50 kN dual column testing machine at a constant crosshead displacement rate of 12 mm/min. It was found that the compressive modulus increases with the curing agent concentration. The effects of cyclic compression on strain hardening, compressive modulus, and creep were also investigated. Results showed that cyclic compression contributes to the stabilization of the materials. Moreover, the number of cycles required to reach strain hardening stabilization decreases as the curing agent concentration increases.
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