The Experts below are selected from a list of 2919 Experts worldwide ranked by ideXlab platform
Linh Nguyen - One of the best experts on this subject based on the ideXlab platform.
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simultaneous measurement of temperature and refractive index using an exposed core Microstructured Optical Fiber
IEEE Journal of Selected Topics in Quantum Electronics, 2020Co-Authors: Linh Nguyen, Martin Becker, Heike Ebendorffheidepriem, Dinh Pham, Stephen C WarrensmithAbstract:We have demonstrated a novel scheme for simultaneous measurement of temperature and refractive index by using an exposed core Microstructured Optical Fiber (ECF). The ECF allows for high sensitivity to refractive index due to the small exposed-core, while being supported by a standard Fiber diameter cladding making it robust compared to Optical microFibers. The sensor combines a Fiber Bragg grating (FBG) inscribed into the core of the ECF and a multimode Mach–Zehnder interferometer (MZI). Both the FBG and MZI are sensitive to refractive index (RI) and temperature through a combination of direct access to the evanescent field via the exposed-core, the thermo-optic effect, and thermal expansion. The FBG and MZI respond differently to changes in temperature and RI, thus allowing for the simultaneous measurement of these parameters. In our experiment, RI sensitivities of 5.85 nm/RIU and 794 nm/RIU, and temperature sensitivities of 8.72 pm/°C and −57.9 pm/°C, were obtained for the FBG and MZI respectively. We demonstrate that a transfer matrix approach can be used to simultaneously measure both parameters, solving the problem of temperature sensitivity of RI sensors due to the high thermo-optic coefficient of aqueous samples.
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high sensitivity sagnac interferometer biosensor based on exposed core Microstructured Optical Fiber
Sensors and Actuators B-chemical, 2018Co-Authors: Yong Zhao, Heike Ebendorffheidepriem, Linh Nguyen, Stephen C WarrensmithAbstract:Abstract A novel, high sensitivity Sagnac-interferometer biosensor based on exposed core Microstructured Optical Fiber (ECF) has been designed and implemented in this paper. The exposed core Fiber has noncircular symmetry and thus exhibits birefringence and can form a sensing element within a Sagnac loop interferometer. The exposed-core Fiber design provides direct access to the evanescent field, allowing the measurement of bulk refractive index (RI) with a sensitivity of up to −3137 nm/RIU while maintaining the Fiber’s robustness. The sensor can also detect the localized refractive index changes at the Fiber core’s surface as the result of a biological binding event. We demonstrate the use of this sensor for label-free sensing of biological molecules by immobilizing biotin onto the Fiber core as the probe to capture the target molecule streptavidin.
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Interferometric-type Optical biosensor based on exposed core Microstructured Optical Fiber
Sensors and Actuators B-chemical, 2015Co-Authors: Linh Nguyen, Stephen C. Warren-smith, Kelly Hill, Tanya M MonroAbstract:Abstract This work presents a novel biosensor using the multimode interference effect in an exposed core Microstructured Optical Fiber (ECF). In this work biotin molecules are immobilized onto the ECF core surface to serve as the capturing probe for streptavidin, the target molecules. Since each distinct guided mode in the ECF interacts with the surrounding medium differently, the interference between any two specific modes will experience a fringe shift (or phase change) upon a change in the refractive index (RI) of the surrounding medium, or a localized RI change on the surface of the ECF core as a result of a biological binding event. In our experiment, the interferometric sensing platform was realized by splicing a section of ECF with lead-in and lead-out single mode Fibers (SMFs). An interference pattern is obtained in the transmission spectrum as the result of multiple excited modes (excited and re-collected at the lead-in and lead-out splicing points) propagating in the ECF with different propagation constants. The interference pattern is non-uniform, indicating that there are more than two modes involved. Fast Fourier transform (FFT) is used to separate individual interference patterns that contribute to this complex spectrum and monitor their phase changes upon RI variation of the surrounding medium. In this way multiple RI sensitivities can be realized because each spatial frequency possesses a distinct sensitivity with respect to the surrounding RI. The operation of this device was validated by measuring the phase changes that occur when the sensing platform was subjected to solutions of different RIs or functionalized with different molecules. A biosensor was demonstrated based on this novel platform using biotin as the capturing probe to specifically detect streptavidin with low non-specific adsorption. The proposed platform is reliable, cost-effective, and offers a potential label-free biosensing alternative to the widely used surface plasmon resonance (SPR) technique.
Benjamin John Eggleton - One of the best experts on this subject based on the ideXlab platform.
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Ultrasensitive photonic crystal Fiber refractive index sensor
Optics Letters, 2009Co-Authors: Darran K C Wu, Boris T Kuhlmey, Benjamin John EggletonAbstract:We introduce a microfluidic refractive index sensor based on a directional coupler architecture using solid-core photonic crystal Fibers. The sensor achieves very high sensitivity by coupling the core mode to a mode in the adjacent fluid-filled waveguide that is beyond modal cutoff, and with strong field overlap. We demonstrate the device through the selective infiltration of a single hole with fluid along a Microstructured Optical Fiber. A detection limit of 4.6×10−7 refractive index units has been derived from measurements with a sensitivity of 30,100 nm per refractive index unit, which is the highest for a Fiber device to date.
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Microfluidic tunable photonic band-gap device
Applied Physics Letters, 2004Co-Authors: Peter Domachuk, Markus Straub, H. C. Nguyen, Benjamin John Eggleton, M GuAbstract:We introduce a method for tuning a photonic band-gapmaterial by means of displacing microfluidic plugs. The fluid is introduced into air voids that constitute the structure of the photonic crystal and is displaced using a capillary heater. The photonic crystal geometry is obtained using a Microstructured Optical Fiber, comprising a periodically spaced array of air holes that is interrogated in the transverse direction, creating a “tall microchip.” Optical spectra are compared to band structure calculations of an idealized band-gapmaterial.
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numerical analysis and experimental design of tunable birefringence in Microstructured Optical Fiber
Optics Express, 2002Co-Authors: Charles Kerbage, Benjamin John EggletonAbstract:We present detailed experimental and numerical results for birefringence tuning in Microstructured Optical Fibers. Index tunable polymer is infused into specific air-holes to obtain birefringence whose tunability is achieved by temperature tuning the polymer index. We also study the symmetry properties of the modes for different waveguide structures.
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Highly tunable birefringent Microstructured Optical Fiber.
Optics letters, 2002Co-Authors: Charles Kerbage, Paul Steinvurzel, A. Hale, Robert S. Windeler, P Reyes, Paul S Westbrook, Benjamin John EggletonAbstract:We demonstrate a method for introducing and dynamically tuning birefringence in a Microstructured Optical Fiber. Waveguide asymmetry in the Fiber is obtained by selective filling of air holes with polymer, and tunability is achieved by temperature tuning of the polymer's index. The Fiber is tapered such that the mode field expands into the cladding and efficiently overlaps the polymer that has been infused into the air holes, ensuring enhanced tunability and low splice loss. Experimental results are compared with numerical simulations made with the beam propagation method and confirm birefringence tuning that corresponds to a phase change of 6pi for a 1-cm length of Fiber.
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Microstructured Optical Fiber devices.
Optics express, 2001Co-Authors: Benjamin John Eggleton, P Westbrook, Robert S. Windeler, Charles Kerbage, A. HaleAbstract:We present several applications of Microstructured Optical Fibers and study their modal characteristics by using Bragg gratings inscribed into photosensitive core regions designed into the air-silica microstructure. The unique characteristics revealed in these studies enable a number of functionalities including tunability and enhanced nonlinearity that provide a platform for Fiber device applications. We discuss experimental and numerical tools that allow characterization of the modes of the Fibers.
Stephen C Warrensmith - One of the best experts on this subject based on the ideXlab platform.
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simultaneous measurement of temperature and refractive index using an exposed core Microstructured Optical Fiber
IEEE Journal of Selected Topics in Quantum Electronics, 2020Co-Authors: Linh Nguyen, Martin Becker, Heike Ebendorffheidepriem, Dinh Pham, Stephen C WarrensmithAbstract:We have demonstrated a novel scheme for simultaneous measurement of temperature and refractive index by using an exposed core Microstructured Optical Fiber (ECF). The ECF allows for high sensitivity to refractive index due to the small exposed-core, while being supported by a standard Fiber diameter cladding making it robust compared to Optical microFibers. The sensor combines a Fiber Bragg grating (FBG) inscribed into the core of the ECF and a multimode Mach–Zehnder interferometer (MZI). Both the FBG and MZI are sensitive to refractive index (RI) and temperature through a combination of direct access to the evanescent field via the exposed-core, the thermo-optic effect, and thermal expansion. The FBG and MZI respond differently to changes in temperature and RI, thus allowing for the simultaneous measurement of these parameters. In our experiment, RI sensitivities of 5.85 nm/RIU and 794 nm/RIU, and temperature sensitivities of 8.72 pm/°C and −57.9 pm/°C, were obtained for the FBG and MZI respectively. We demonstrate that a transfer matrix approach can be used to simultaneously measure both parameters, solving the problem of temperature sensitivity of RI sensors due to the high thermo-optic coefficient of aqueous samples.
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high sensitivity sagnac interferometer biosensor based on exposed core Microstructured Optical Fiber
Sensors and Actuators B-chemical, 2018Co-Authors: Yong Zhao, Heike Ebendorffheidepriem, Linh Nguyen, Stephen C WarrensmithAbstract:Abstract A novel, high sensitivity Sagnac-interferometer biosensor based on exposed core Microstructured Optical Fiber (ECF) has been designed and implemented in this paper. The exposed core Fiber has noncircular symmetry and thus exhibits birefringence and can form a sensing element within a Sagnac loop interferometer. The exposed-core Fiber design provides direct access to the evanescent field, allowing the measurement of bulk refractive index (RI) with a sensitivity of up to −3137 nm/RIU while maintaining the Fiber’s robustness. The sensor can also detect the localized refractive index changes at the Fiber core’s surface as the result of a biological binding event. We demonstrate the use of this sensor for label-free sensing of biological molecules by immobilizing biotin onto the Fiber core as the probe to capture the target molecule streptavidin.
Yasutake Ohishi - One of the best experts on this subject based on the ideXlab platform.
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fabrication of all solid asse2 as2s5Microstructured Optical Fiber with two zero dispersion wavelengths for generation of mid infrared dispersive waves
Applied Physics Express, 2016Co-Authors: Tonglei Cheng, Morio Matsumoto, Takenobu Suzuki, Tong Hoang Tuan, Lai Liu, Xiaojie Xue, Hiroshige Tezuka, Yasutake OhishiAbstract:We design and fabricate an all-solid chalcogenide Microstructured Optical Fiber (MOF) with four rods in the cladding, in order to generate mid-infrared (MIR) dispersive waves (DWs). The high-index background is made of AsSe2 glass, and the four low-index rods are made of As2S5 glass. This MOF has two zero-dispersive wavelengths: ~3,720 and 4,230 nm. The propagation loss is ~1.9 dB/m at 2,000 nm, and the nonlinear coefficient is ~4 × 103 km−1 W−1 at 3,000 nm. Using a pulse of ~80 MHz and ~200 fs emitted from an Optical parametric oscillator as the pump source, the resulting MIR DWs are investigated at different pump wavelengths.
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fabrication and characterization of a hybrid four hole asse 2 as 2 s 5 Microstructured Optical Fiber with a large refractive index difference
Optics Express, 2014Co-Authors: Tonglei Cheng, Yasuhire Kanou, Dinghuan Deng, Morio Matsumoto, Takashi Misumi, Takenobu Suzuki, Yasutake OhishiAbstract:A hybrid four-hole AsSe2-As2S5 Microstructured Optical Fiber (MOF) with a large refractive index difference is fabricated by the rod-in-tube drawing technique. The core and the cladding are made from the AsSe2 glass and As2S5 glass, respectively. The propagation loss is ~1.8 dB/m and the nonlinear coefficient is ~2.03 × 104 km−1W−1at 2000 nm. Raman scattering is observed in the normal dispersion regime when the Fiber is pumped by a 2 μm mode-locked picosecond Fiber laser. Additionally, soliton is generated in the anomalous dispersion regime when the Fiber is pumped by an Optical parametric oscillator (OPO) at the pump wavelength of ~3000 nm.
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design and optimization of tellurite hybrid Microstructured Optical Fiber with high nonlinearity and low flattened chromatic dispersion for Optical parametric amplification
Optics Communications, 2014Co-Authors: Tonglei Cheng, Dinghuan Deng, Takenobu Suzuki, Zhongchao Duan, Koji Asano, Tong Hoang Tuan, Yasutake OhishiAbstract:Abstract The linear phase-mismatch and the Optical signal gain in the highly nonlinear tellurite hybrid Microstructured Optical Fiber based on the degenerate four-wave mixing are numerically simulated. The core and the cladding of this Fiber are designed by TeO2–Li2O–WO3–MoO3–Nb2O5 and TeO2–ZnO–Na2CO3–P2O5 glass, respectively. This Fiber has high nonlinearity and at the same time the chromatic dispersion is flattened and close to zero. High Optical signal gain and broad band can be obtained by using a short length of this Fiber with low pump power.
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soliton self frequency shift and dispersive wave in a hybrid four hole asse2 as2s5 Microstructured Optical Fiber
Applied Physics Letters, 2014Co-Authors: Tonglei Cheng, Yasuhire Kanou, Dinghuan Deng, Morio Matsumoto, Takashi Misumi, Takenobu Suzuki, Meisong Liao, Koji Asano, Yasutake OhishiAbstract:A hybrid four-hole AsSe2-As2S5 Microstructured Optical Fiber (MOF) is fabricated by the rod-in-tube drawing technique. The core is made of AsSe2 glass and the cladding is made of As2S5 glass. The material refractive indices of the core and the cladding are ∼2.832 and ∼2.219 at the wavelength of ∼2.8 μm, respectively. The calculated zero-dispersion wavelength of the AsSe2-As2S5 MOF is 2.759 μm. Soliton self-frequency shift with a soliton central wavelength from 2.986 to 3.419 μm is observed when the AsSe2-As2S5 MOF is pumped by an Optical parametric oscillator at the pump wavelength of ∼2.8 μm. At the same time a blue-shift dispersive wave is emitted by the soliton.
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Optical parametric gain and bandwidth in highly nonlinear tellurite hybrid Microstructured Optical Fiber with four zero dispersion wavelengths
Optics Express, 2013Co-Authors: Tong Hoang Tuan, Tonglei Cheng, Dinghuan Deng, Takenobu Suzuki, Weiqing Gao, Zhongchao Duan, Koji Asano, Yasutake OhishiAbstract:The parametric amplification gain and bandwidth in highly nonlinear tellurite hybrid Microstructured Optical Fiber (HMOF) are simulated based on four wave mixing process. The Fiber core and cladding materials are made of TeO2–Li2O–WO3–MoO3–Nb2O5 and TeO2–ZnO–Na2O–P2O5 glass, respectively. The Fiber has four zero-dispersion wavelengths and the chromatic dispersion is flattened near the zero-dispersion wavelengths. A broad gain bandwidth as wide as 1200 nm from 1290 to 2490 nm can be realized in the near infrared window by using a tellurite HMOF as short as 25 cm.
Tanya M Monro - One of the best experts on this subject based on the ideXlab platform.
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Interferometric-type Optical biosensor based on exposed core Microstructured Optical Fiber
Sensors and Actuators B-chemical, 2015Co-Authors: Linh Nguyen, Stephen C. Warren-smith, Kelly Hill, Tanya M MonroAbstract:Abstract This work presents a novel biosensor using the multimode interference effect in an exposed core Microstructured Optical Fiber (ECF). In this work biotin molecules are immobilized onto the ECF core surface to serve as the capturing probe for streptavidin, the target molecules. Since each distinct guided mode in the ECF interacts with the surrounding medium differently, the interference between any two specific modes will experience a fringe shift (or phase change) upon a change in the refractive index (RI) of the surrounding medium, or a localized RI change on the surface of the ECF core as a result of a biological binding event. In our experiment, the interferometric sensing platform was realized by splicing a section of ECF with lead-in and lead-out single mode Fibers (SMFs). An interference pattern is obtained in the transmission spectrum as the result of multiple excited modes (excited and re-collected at the lead-in and lead-out splicing points) propagating in the ECF with different propagation constants. The interference pattern is non-uniform, indicating that there are more than two modes involved. Fast Fourier transform (FFT) is used to separate individual interference patterns that contribute to this complex spectrum and monitor their phase changes upon RI variation of the surrounding medium. In this way multiple RI sensitivities can be realized because each spatial frequency possesses a distinct sensitivity with respect to the surrounding RI. The operation of this device was validated by measuring the phase changes that occur when the sensing platform was subjected to solutions of different RIs or functionalized with different molecules. A biosensor was demonstrated based on this novel platform using biotin as the capturing probe to specifically detect streptavidin with low non-specific adsorption. The proposed platform is reliable, cost-effective, and offers a potential label-free biosensing alternative to the widely used surface plasmon resonance (SPR) technique.
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Exposed core Microstructured Optical Fiber Bragg gratings: refractive index sensing.
Optics Express, 2014Co-Authors: Stephen C. Warren-smith, Tanya M MonroAbstract:Bragg gratings have been written in exposed-core Microstructured Optical Fibers for the first time using a femtosecond laser. Second and third order gratings have been written and both show strong reflectivity at 1550 nm, with bandwidths as narrow as 60 pm. Due to the penetration of the guided field outside the Fiber the Bragg reflections are sensitive to the external refractive index. As different modes have different sensitivities to refractive index but the same temperature sensitivity the sensor can provide temperature-compensated refractive index measurements. Since these Bragg gratings have been formed by physical ablation, these devices can also be used for high temperature sensing, demonstrated here up to 800°C. The Fibers have been spliced to single mode Fiber for improved handling and integration with commercial interrogation units.
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fabrication and supercontinuum generation in dispersion flattened bismuth Microstructured Optical Fiber
Optics Express, 2011Co-Authors: Wen Qi Zhang, Tanya M Monro, Heike Ebendorffheidepriem, Shahraam V AfsharAbstract:We fabricated a Microstructured Optical Fiber with a dispersion profile that, according to calculations, is near-zero and flat, with 3 zero dispersion wavelengths in the mid-IR. To the best of our knowledge this is the first report of the fabrication of such a Fiber. Simulations of multimode supercontinuum generation were performed using a simplified approach. Strong agreement between experiments and simulations were observed using this approach.
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highly efficient excitation and detection of whispering gallery modes in a dye doped microsphere using a Microstructured Optical Fiber
Applied Physics Letters, 2011Co-Authors: Alexandre Francois, Kristopher J Rowland, Tanya M MonroAbstract:A technique for the excitation of whispering gallery modes (WGMs) has been demonstrated using a dye-doped microsphere positioned onto the tip of a suspended core Microstructured Optical Fiber. With this configuration, we have shown that both the excitation and collection efficiency of the WGMs modulated fluorescence spectra of the dye are greatly improved compared to a more conventional excitation scheme; an overall efficiency increase by a factor of 200 is demonstrated. It is also shown that positioning the resonator onto the Fiber tip does not impact its sensitivity, providing a compact and robust architecture for applications such as localized in-vivo/vitro biosensing.
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extruded single mode high index core one dimensional Microstructured Optical Fiber with high index contrast for highly nonlinear Optical devices
Applied Physics Letters, 2005Co-Authors: Xian Feng, Tanya M Monro, P Petropoulos, V Finazzi, D J RichardsonAbstract:We report the fabrication of a high-index-core one-dimensional Microstructured Optical Fiber incorporating with high index-contrast layers, using extrusion technique for preform fabrication. Single mode guidance and a high effective nonlinearity of 260±30W−1km−1 were observed in the Fiber at 1.55μm, highlighting the potential of such Fibers for use in nonlinear Optical devices.