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https://www.readbyqxmd.com/read/30513963/high-sensitivity-photonic-crystal-fiber-refractive-index-sensor-with-gold-coated-externally-based-on-surface-plasmon-resonance
#1
Xudong Li, Shuguang Li, Xin Yan, Dongming Sun, Zheng Liu, Tonglei Cheng
In this paper we propose a gold-plated photonic crystal fiber (PCF) refractive index sensor based on surface plasmon resonance (SPR), in which gold is coated on the external surface of PCF for easy fabrication and practical detection. The finite element method (FEM) is used for the performance analysis, and the numerical results show that the thickness of the gold film, the refractive index of the analyte, the radius of the air hole in the first layer, the second layer, and the central air hole can affect the sensing properties of the sensor...
December 3, 2018: Micromachines
https://www.readbyqxmd.com/read/30477259/development-of-dispersion-optimized-photonic-crystal-fibers-based-on-heavy-metal-oxide-glasses-for-broadband-infrared-supercontinuum-generation-with-fiber-lasers
#2
Grzegorz Stępniewski, Jacek Pniewski, Dariusz Pysz, Jarosław Cimek, Ryszard Stępień, Mariusz Klimczak, Ryszard Buczyński
In this work a photonic crystal fiber made of a heavy metal oxide glass with optimized dispersion profile is proposed for supercontinuum generation in a broad range of wavelengths in the near-infrared, when pumped by a mode-locked fiber-based laser. The fiber is modelled and optimal geometrical parameters are selected to achieve flat and low dispersion in the anomalous regime. Supercontinuum generation in the range of 0.76⁻2.40 µm, within the dynamics of 30 dB, when pumped at 1.56 µm with 400 fs⁻long pulses and an average power 660 mW is possible...
November 25, 2018: Sensors
https://www.readbyqxmd.com/read/30475594/a-hollow-core-photonics-crystal-fiber-based-miniaturized-sensor-for-detection-of-aggregation-induced-emission-molecules
#3
Huifang Chen, Qinjian Jiang, Yanqing Qiu, Xuechun Chen, Bo Fan, Yi Wang, Dongning Wang
A miniature sensor for detection of aggregation-induced emission (AIE) molecule is proposed in this work. The sensing head is fabricated by use of hollow core photonic crystal fiber with a core diameter of about 4.8 μm. The cladding holes are sealed by fusion splicing technique while the central hole remains open to allow the filtration of solution with AIE molecules. When the solution is excited by ultraviolet lamp, the fluorescence light is received by a fiber optic spectrometer. The fluorescence intensity is associated with the concentration of AIE molecules and the infiltrated core length...
November 26, 2018: Analytical Chemistry
https://www.readbyqxmd.com/read/30469909/dual-polarized-highly-sensitive-plasmonic-sensor-in-the-visible-to-near-ir-spectrum
#4
Md Saiful Islam, Jakeya Sultana, Ahmmed A Rifat, Rajib Ahmed, Alex Dinovitser, Brian W-H Ng, Heike Ebendorff-Heidepriem, Derek Abbott
We propose and numerically characterize the optical characteristics of a novel photonic crystal fiber (PCF) based surface plasmon resonance (SPR) sensor in the visible to near infrared (500-2000 nm) region for refractive index (RI) sensing. The finite element method (FEM) is used to design and study the influence of different geometric parameters on the sensing performance of the sensor. The chemically stable plasmonic material gold (Au) is used to produce excitation between the core and plasmonic mode. On a pure silica (SiO2 ) substrate, a rectangular structured core is used to facilitate the coupling strength between the core and the surface plasmon polariton (SPP) mode and thus improves the sensing performance...
November 12, 2018: Optics Express
https://www.readbyqxmd.com/read/30469900/excitation-of-higher-order-modes-in-optofluidic-photonic-crystal-fiber
#5
Andrei Ruskuc, Philipp Koehler, Marius A Weber, Ana Andres-Arroyo, Michael H Frosz, Philip St J Russell, Tijmen G Euser
Higher-order modes up to LP33 are controllably excited in water-filled kagomé- and bandgap-style hollow-core photonic crystal fibers (HC-PCF). A spatial light modulator is used to create amplitude and phase distributions that closely match those of the fiber modes, resulting in typical launch efficiencies of 10-20% into the liquid-filled core. Modes, excited across the visible wavelength range, closely resemble those observed in air-filled kagomé HC-PCF and match numerical simulations. Mode indices are obtained by launching plane-waves at specific angles onto the fiber input-face and comparing the resulting intensity pattern to that of a particular mode...
November 12, 2018: Optics Express
https://www.readbyqxmd.com/read/30469848/wavelength-multiplexing-of-four-wave-mixing-based-fiber-temperature-sensor-with-oil-filled-photonic-crystal-fiber
#6
Y Geng, L Wang, Y Xu, A G Kumar, X Tan, X Li
A fiber temperature sensor based on four-wave mixing (FWM) with an oil-filled photonic crystal fiber (PCF) is proposed in this study, and a multipoint measurement based on the wavelength multiplexing of such sensors is constructed for the first time. The sensing performance and signal spectral characteristics of the temperature sensor are theoretically and experimentally studied. The maximum temperature sensitivity of the signal light of 0.207 nm/°C is achieved using a FWM sensing fiber with a length of 10 cm...
October 15, 2018: Optics Express
https://www.readbyqxmd.com/read/30469651/feature-issue-introduction-topological-photonics-and-materials
#7
Jensen Li, Zubin Jacob, Takeshige Omatsu
Photonic crystals have become a very common and powerful concept in optics since its introduction in the 1980s by Eli Yablonovitch and Sajeev John. It is in fact a concept borrowed from condensed matter physics. The discussion of photonic bands and bandgaps allows us to manipulate light on an optical chip, along a photonic crystal fiber and even in the quantum optics regime. Now, we are witnessing another round of concept translation again from condensed matter physics to optics about topology. Describing photonic bands by using their topology in the reciprocal space gives us a new tool to understand wave propagation and to design optical components...
September 17, 2018: Optics Express
https://www.readbyqxmd.com/read/30464320/physical-origin-of-higher-order-soliton-fission-in-nanophotonic-semiconductor-waveguides
#8
Charles Ciret, Simon-Pierre Gorza, Chad Husko, Gunther Roelkens, Bart Kuyken, François Leo
Supercontinuum generation in Kerr media has become a staple of nonlinear optics. It has been celebrated for advancing the understanding of soliton propagation as well as its many applications in a broad range of fields. Coherent spectral broadening of laser light is now commonly performed in laboratories and used in commercial "white light" sources. The prospect of miniaturizing the technology is currently driving experiments in different integrated platforms such as semiconductor on insulator waveguides...
November 21, 2018: Scientific Reports
https://www.readbyqxmd.com/read/30462073/broadband-single-polarization-filter-of-d-shaped-photonic-crystal-fiber-with-a-micro-opening-based-on-surface-plasmon-resonance
#9
Ying Guo, Jianshe Li, Shuguang Li, Shuhuan Zhang, Yundong Liu
In this paper, a D-shaped photonic crystal fiber is designed to achieve a single-polarization filter that has a broadband filtering property. The D-shaped structure is a triangular array of air holes, forming a micro-opening on the side-polished surface and plating a gold layer thereon. The investigation of the polarization filter is based on the finite element method; its principle is surface plasmon resonance. The single-polarization filter in the y direction is realized by adjusting parameters such as the apertures of the fiber, the thickness of the gold layer, and the polishing depth...
September 20, 2018: Applied Optics
https://www.readbyqxmd.com/read/30461788/highly-sensitive-dual-core-photonic-crystal-fiber-based-on-a-surface-plasmon-resonance-sensor-with-a-silver-nano-continuous-grating
#10
Shengxi Jiao, Sanfeng Gu, Hanrui Yang, Hairui Fang, Shibo Xu
Two kinds of photonic crystal fiber (PCF) sensors based on surface plasmon resonance (SPR) with silver nano-continuous gratings (i) and (ii) are designed. The coupling characteristics and sensing properties are analyzed numerically by the finite element method (FEM). The results show that the proposed sensor based on silver nano-continuous grating (i) can achieve better performance than that of the sensors based on silver nano-continuous grating (ii) and plane silver film structures. When the segmented number is 50 and segmented angle is 0...
October 1, 2018: Applied Optics
https://www.readbyqxmd.com/read/30424070/optofluidics-refractometers
#11
REVIEW
Cheng Li, Gang Bai, Yunxiao Zhang, Min Zhang, Aoqun Jian
Refractometry is a classic analytical method in analytical chemistry and biosensing. By integrating advanced micro- and nano-optical systems with well-developed microfluidics technology, optofluidics are shown to be a powerful, smart and universal platform for refractive index sensing applications. This paper reviews recent work on optofluidic refractometers based on different sensing mechanisms and structures (e.g., photonic crystal/photonic crystal fibers, waveguides, whisper gallery modes and surface plasmon resonance), and traces the performance enhancement due to the synergistic integration of optics and microfluidics...
March 20, 2018: Micromachines
https://www.readbyqxmd.com/read/30336574/an-eight-channel-c-band-demux-based-on-multicore-photonic-crystal-fiber
#12
Dror Malka, Gilad Katz
A novel eight-channel demux device based on multicore photonic crystal fiber (PCF) structures that operate in the C-band range (1530⁻1565 nm) has been demonstrated. The PCF demux design is based on replacing some air-hole areas with lithium niobate and silicon nitride materials over the PCF axis alongside with the appropriate optimizations of the PCF structure. The beam propagation method (BPM) combined with Matlab codes was used to model the demux device and optimize the geometrical parameters of the PCF structure...
October 17, 2018: Nanomaterials
https://www.readbyqxmd.com/read/30320787/off-axis-core-transmission-characteristics-of-helically-twisted-photonic-crystal-fibers
#13
Takeshi Fujisawa, Kunimasa Saitoh
The transmission characteristics of helically twisted photonic crystal fibers (PCFs) having off-axis cores are theoretically investigated for the first time, to the best of our knowledge. Due to the modified equivalent permittivity and permeability tensors induced by helical twisting, the transmission characteristics of helically twisted PCFs depend on the core position. A beam propagation method developed for helically twisted waveguides, which qualitatively and quantitatively explained the reported transmission spectra of helically twisted PCFs, is used for the analysis...
October 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/30320773/opto-electronic-oscillator-mediated-by-acoustic-wave-in-a-photonic-crystal-fiber-stimulated-in-1-%C3%AE-m-band
#14
Sigang Yang, Yi Yang, Jinyan Li, Siming Ding, Hongwei Chen, Minghua Chen, Shizhong Xie
An opto-electronic oscillator based on guided acoustic wave Brillouin scattering in a photonic crystal fiber (PCF) stimulated by a light wave in 1 μm band is proposed and demonstrated. A short length of a homemade PCF stimulated by relatively low pump power leads to strong coupling between the pump and probe waves. The oscillation is realized in a feedback loop, in which the acoustic wave bridges the pump and probe. Oscillation is achieved at 1.237 GHz, which matches the resonance of the acoustic mode, in a single-longitudinal-mode operation of the hybrid cavity...
October 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/30177648/analysis-of-high-sensitivity-photonic-crystal-fiber-sensor-based-on-surface-plasmon-resonance-of-refractive-indexes-of-liquids
#15
Xin Yan, Bin Li, Tonglei Cheng, Shuguang Li
A photonic crystal fiber (PCF) sensor based on gold nanowires able to detect changes in surface plasmon resonance (SPR) was proposed and numerically investigated through the finite element method. To facilitate real-time detection, the analyte in this sensor was located outside the optical fiber. The effects of diameters of both air hole and gold wires on the sensing characteristics of the sensor were discussed. The sensor was designed to detect liquids with refractive indexes ranging between 1.33 and 1.36...
September 3, 2018: Sensors
https://www.readbyqxmd.com/read/30137989/detection-of-saturated-fatty-acids-associated-with-a-self-healing-synthetic-biological-membrane-using-fiber-enhanced-surface-enhanced-raman-scattering
#16
A'Lester C Allen, Jaione Romero-Mangado, Staci Adams, Michael Flynn, Bin Chen, Jin Z Zhang
The Synthetic Biological Membrane (SBM) project at NASA Ames developed a portable, self-repairing wastewater purification system. The self-repair process relies upon secreted fatty acids from a genetically engineered organism. However, solubilized fatty acids are difficult to detect using conventional methods. Surface-enhanced Raman scattering (SERS) was used to successfully detect solubilized fatty acids with the following limits of detection: 10-9 , 10-8 , 10-9 , and 10-6 M for decanoic acid, myristic acid, palmitic acid, and stearic acid, respectively...
September 6, 2018: Journal of Physical Chemistry. B
https://www.readbyqxmd.com/read/30130945/analytical-mode-normalization-and-resonant-state-expansion-for-bound-and-leaky-modes-in-optical-fibers-an-efficient-tool-to-model-transverse-disorder
#17
S Upendar, I Allayarov, M A Schmidt, T Weiss
We adapt the resonant state expansion to optical fibers such as capillary and photonic crystal fibers. As a key requirement of the resonant state expansion and any related perturbative approach, we derive the correct analytical normalization for all modes of these fiber structures, including leaky modes that radiate energy perpendicular to the direction of propagation and have fields that grow with distance from the fiber core. Based on the normalized fiber modes, an eigenvalue equation is derived that allows for calculating the influence of small and large perturbations such as structural disorder on the guiding properties...
August 20, 2018: Optics Express
https://www.readbyqxmd.com/read/30130901/flexible-dual-soliton-manipulation-for-coherent-anti-stokes-raman-scattering-spectroscopy
#18
Tao Wu, Kun Chen, Huijie Zhao, Weipeng Zhang, Yan Li, Haoyun Wei
Though dual soliton is used as the Stokes source in coherent anti-Stokes Raman scattering (CARS) experiments, the mechanism behind it is still not fully investigated. In this paper, dual-soliton pulses generation with a highly birefringent photonic crystal fiber (PCF) is numerically explored and experimentally verified. The simulated pulse exhibits various characteristics in the temporal and spectral domains with respect to the input linear polarization angle, and can be classified into four regions based on distances in the temporal and spectral domain of the soliton pair...
August 20, 2018: Optics Express
https://www.readbyqxmd.com/read/30130895/fused-silica-photonic-crystal-fiber-with-heavily-germanium-doped-microinclusion-in-the-core-dedicated-to-couple-guide-and-control-lp-02-higher-order-mode
#19
Tomasz Stefaniuk, Grzegorz Stępniewski, Dariusz Pysz, Ryszard Stępień, Ryszard Buczyński
We report on modeling, development, and optical characterization of fused silica photonic crystal fiber with germanium doped microinclusion placed in the middle of the core. The fiber is designed to efficiently couple and guide LP02 mode. It offers high optical density in the center region, large mode separation, low losses, and small dispersion with relatively flat profile for both LP01 and LP02 modes in 1-1.6 µm wavelength range. We demonstrate that by changing geometrical and material parameters of the inclusion partially independent tuning of propagation constants of individual modes is possible, what might be found is a variety of potential applications, e...
August 20, 2018: Optics Express
https://www.readbyqxmd.com/read/30130887/hollow-core-fiber-assisted-absorption-spectroscopy-of-methane-at-3-4-%C3%A2%C2%B5m
#20
Michał Nikodem, Karol Krzempek, Grzegorz Dudzik, Krzysztof Abramski
A laser-based spectrometer exploiting a novel Kagome-type hollow core photonic crystal fiber, which serves as a gas cell is demonstrated. Low attenuation of this silica-based fiber in the 3.4 µm wavelength region enables accessing strong, fundamental transitions of methane, which was used as a target analyte in the presented experiment. With an all-fiber differential frequency generation source combined with wavelength modulation spectroscopy technique detection limit at single parts-per-million by volume level was obtained...
August 20, 2018: Optics Express
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