摘要 :
In this work two methods of making Mach-Zehnder Interferometer (MZI) for sensitive ambient refractive index (IR) measurement have been proposed by using photonic crystal fiber (PCF). PCF-MZI is fabricated by fusion splicing a shor...
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In this work two methods of making Mach-Zehnder Interferometer (MZI) for sensitive ambient refractive index (IR) measurement have been proposed by using photonic crystal fiber (PCF). PCF-MZI is fabricated by fusion splicing a short length of PCF between two single-mode fibers (SMF) with fully collapsed air holes in splicing region. Consequently, the fundamental core mode of PCF can be coupled to cladding modes at the first coupling region and then re-coupled to the core mode at the second coupling region. Miniaturized MZI is constructed using sharply tapered PCF and influence of sharp-tapering of PCF is then studied. Sharp-tapering of PCF over a short length of PCF is utilized by using tiny flame geometry. Experimental results verifies that sharp-tapering has a greater impact on refractive index sensitivity enhancement compare to decreasing taper waist diameter. MZI with length of 3.8 mm and taper waist diameter of 65 μm shows RI sensitivity of 677 to the miniaturized MZI, two types of polymer-deposited PCF-MZI is fabricated. Chitosan with RI～1.54 and Polycaprolactone (PCL) with RI～1.15 was filled into the cladding air-holes of PCF using capillary force. Chitosan-filled PCF with length of 10 mm shows RI sensitivity of 198.6 nm/RIU for RI range of 1.3327-1.3556, 474.5 nm/RIU for RI range of 1.3556 to 1.3917 and 677.8 nm/RIU for RI range of 1.3917-1.4204.
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摘要 :
In this work two methods of making Mach-Zehnder Interferometer (MZI) for sensitive ambient refractive index (IR) measurement have been proposed by using photonic crystal fiber (PCF). PCF-MZI is fabricated by fusion splicing a shor...
展开
In this work two methods of making Mach-Zehnder Interferometer (MZI) for sensitive ambient refractive index (IR) measurement have been proposed by using photonic crystal fiber (PCF). PCF-MZI is fabricated by fusion splicing a short length of PCF between two single-mode fibers (SMF) with fully collapsed air holes in splicing region. Consequently, the fundamental core mode of PCF can be coupled to cladding modes at the first coupling region and then re-coupled to the core mode at the second coupling region. Miniaturized MZI is constructed using sharply tapered PCF and influence of sharp-tapering of PCF is then studied. Sharp-tapering of PCF over a short length of PCF is utilized by using tiny flame geometry. Experimental results verifies that sharp-tapering has a greater impact on refractive index sensitivity enhancement compare to decreasing taper waist diameter. MZI with length of 3.8 mm and taper waist diameter of 65 urn shows RI sensitivity of 677 to the miniaturized MZI, two types of polymer-deposited PCF-MZI is fabricated. Chitosan with RI~1.54 and Polycaprolactone (PCL) with RI~1.15 was filled into the cladding air-holes of PCF using capillary force. Chitosan-filled PCF with length of 10 mm shows RI sensitivity of 198.6 nm/RIU for RI range of 1.3327-1.3556, 474.5 nm/RIU for RI range of 1.3556 to 1.3917 and 677.8 nm/RIU for RI range of 1.3917-1.4204.
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A study of polymer photonic crystal fiber (PCF) sensor coated with smart composite materials for measurements of refractive index of analyte is presented in this paper. The proposed sensor combines the characteristics of polymer P...
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A study of polymer photonic crystal fiber (PCF) sensor coated with smart composite materials for measurements of refractive index of analyte is presented in this paper. The proposed sensor combines the characteristics of polymer PCF and composite material, which can make the confinement loss lower than the silica PCF duo to the double interaction of the polymer and silver film. The results obtained in this study demonstrate that polymer PCF sensors coated with composite material and with the polymer PCF's advantages, the sensor's feasibility can be improved further and it can be applied in a broad field, especially in biosensing platforms.
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摘要 :
A study of polymer photonic crystal fiber (PCF) sensor coated with smart composite materials for measurements of refractive index of analyte is presented in this paper. The proposed sensor combines the characteristics of polymer P...
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A study of polymer photonic crystal fiber (PCF) sensor coated with smart composite materials for measurements of refractive index of analyte is presented in this paper. The proposed sensor combines the characteristics of polymer PCF and composite material, which can make the confinement loss lower than the silica PCF duo to the double interaction of the polymer and silver film. The results obtained in this study demonstrate that polymer PCF sensors coated with composite material and with the polymer PCF's advantages, the sensor's feasibility can be improved further and it can be applied in a broad field, especially in biosensing platforms.
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Fibre Bragg gratings have been inscribed in multimode microstructured polymer optical fibre (POF), with a core size of 50μm. The microstructured POF (mPOF) consists of a three ring hole structure and is made purely from poly(meth...
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Fibre Bragg gratings have been inscribed in multimode microstructured polymer optical fibre (POF), with a core size of 50μm. The microstructured POF (mPOF) consists of a three ring hole structure and is made purely from poly(methyl methacrylate) (PMMA). In comparison to silica fibre, POF has a much smaller Young's modulus and a much greater breaking strain; additionally multimode fibre holds advantages of ease of handling and launching conditions. A linear strain sensitivity of 1.32 ± 0.01pm/με has been measured in the range 0 to 2% strain. The fibre drawing process leads to a degree of molecular alignment along the fibre axis. This alignment can be thermally annealed out; this can induce a permanent blue shift in the Bragg wavelength of a grating fabricated prior to annealing by up to 20 nm. Utilising this, wavelength demultiplexed gratings can be fabricated using a single phase mask. As an illustration of this we present for the first time wavelength division multiplexing of the spectral response of three Bragg gratings in POF within the C-band region. Complementing this work, a technique of splicing mPOF to step index silica fibre is described using UV curing optical adhesive, allowing characterisation of Bragg gratings fabricated in this fibre.
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摘要 :
Fibre Bragg gratings have been inscribed in multimode microstructured polymer optical fibre (POF), with a core size of 50μm. The microstructured POF (mPOF) consists of a three ring hole structure and is made purely from poly(meth...
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Fibre Bragg gratings have been inscribed in multimode microstructured polymer optical fibre (POF), with a core size of 50μm. The microstructured POF (mPOF) consists of a three ring hole structure and is made purely from poly(methyl methacrylate) (PMMA). In comparison to silica fibre, POF has a much smaller Young's modulus and a much greater breaking strain; additionally multimode fibre holds advantages of ease of handling and launching conditions. A linear strain sensitivity of 1.32 ± 0.01pm/με has been measured in the range 0 to 2% strain.
The fibre drawing process leads to a degree of molecular alignment along the fibre axis. This alignment can be thermally annealed out; this can induce a permanent blue shift in the Bragg wavelength of a grating fabricated prior to annealing by up to 20 nm. Utilising this, wavelength demultiplexed gratings can be fabricated using a single phase mask. As an illustration of this we present for the first time wavelength division multiplexing of the spectral response of three Bragg gratings in POF within the C-band region.
Complementing this work, a technique of splicing mPOF to step index silica fibre is described using UV curing optical adhesive, allowing characterisation of Bragg gratings fabricated in this fibre.
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We report a highly tunable liquid-filled photonic bandgap fiber (LF-PBGF) based on both bend and temperature change. Numerical and experimental results are presented, and 177-nm bandwidth tunability is achieved by tuning the tempe...
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We report a highly tunable liquid-filled photonic bandgap fiber (LF-PBGF) based on both bend and temperature change. Numerical and experimental results are presented, and 177-nm bandwidth tunability is achieved by tuning the temperature of the LF-PBGF with bend radius of 5 mm from 40℃ to 60℃.
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In this work, our main achievement was to improve the sensitivity of a biosensor - evanescent mode type; hence contributing to the design of a bacteria sensor in water by choosing an appropriate microstructure of Photonic crystal ...
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In this work, our main achievement was to improve the sensitivity of a biosensor - evanescent mode type; hence contributing to the design of a bacteria sensor in water by choosing an appropriate microstructure of Photonic crystal fiber(PCF) and polymer materials.
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摘要 :
In this work, our main achievement was to improve the sensitivity of a biosensor - evanescent mode type; hence contributing to the design of a bacteria sensor in water by choosing an appropriate microstructure of Photonic crystal ...
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In this work, our main achievement was to improve the sensitivity of a biosensor - evanescent mode type; hence contributing to the design of a bacteria sensor in water by choosing an appropriate microstructure of Photonic crystal fiber(PCF) and polymer materials.
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In this paper we present the combination of a pair of specially designed symmetric-pass (s-p) UHMWPE lenses and a THz waveguide made of the cyclo-olefin polymer Zeonex with a core diameter of about 1.4 times the wavelength to achi...
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In this paper we present the combination of a pair of specially designed symmetric-pass (s-p) UHMWPE lenses and a THz waveguide made of the cyclo-olefin polymer Zeonex with a core diameter of about 1.4 times the wavelength to achieve coupling efficiencies in excess of 50%. The s-p lens is designed to have no spherical aberrations and the same angle of deviation for both surfaces of the lens. The surfaces are calculated numerically, starting at the outer edge. This lens has shown superior performance compared to more traditional lens designs. To achieve sub-wavelength resolution we used a lens with a focal length of 25 mm and a numerical aperture of NA=1. The combination of s-p lenses and Zeonex waveguides offer a promising THz transmission system. Characterisation of the waveguide losses and the dispersion of the waveguide are ongoing.
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