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photonic crystal fiber

Jonas H Osório, Matthieu Chafer, Benoît Debord, Fabio Giovanardi, Martin Cordier, Martin Maurel, Frédéric Delahaye, Foued Amrani, Luca Vincetti, Frédéric Gérôme, Fetah Benabid
Understanding cladding properties is crucial for designing microstructured optical fibers. This is particularly acute for Inhibited-Coupling guiding fibers because of the reliance of their core guidance on the core and cladding mode-field overlap integral. Consequently, careful planning of the fiber cladding parameters allows obtaining fibers with optimized characteristics such as low loss and broad transmission bandwidth. In this manuscript, we report on how one can tailor the modal properties of hollow-core photonic crystal fibers by adequately modifying the fiber cladding...
February 4, 2019: Scientific Reports
Jameesh Keloth, Kali P Nayak, Jie Wang, Makoto Morinaga, Kohzo Hakuta
We show that coherent interaction between two sets of multiple resonances leads to exotic resonant effects, such as Fano-type resonances, optical analogue of electro-magnetically induced transparency, and avoided crossing between modes, under different coupling regimes. We experimentally demonstrate such resonant effects in a photonic crystal nanofiber cavity using two sets of cavity modes with orthogonal polarizations. The interaction between the modes arises due to intra-cavity polarization mixing. The observed line shapes are reproduced using a multiple-mode interaction model...
January 21, 2019: Optics Express
Moutusi De, Tarun Kumar Gangopadhyay, Vinod Kumar Singh
Photonic crystal fiber sensors have potential application in environmental monitoring, industry, biomedicine, food preservation, and many more. These sensors work based on advanced and flexible phototonic crystal fiber (PCF) structures, controlled light propagation for the measurement of amplitude, phase, polarization and wavelength of spectrum, and PCF-incorporated interferometry techniques. In this article various PCF-based physical sensors are summarized with the advancement of time based on reported works...
January 23, 2019: Sensors
Zhiyuan Huang, Ding Wang, Yifei Chen, Ruirui Zhao, Yu Zhao, Sungmo Nam, Changhwan Lim, Yujie Peng, Juan Du, Yuxin Leng
We numerically investigate the generation of wavelength-tunable few-cycle pulses in the visible spectral region through soliton-plasma interactions. We found that in a He-filled single-ring photonic crystal fiber (SR-PCF), soliton-plasma interactions could shift the optical spectra of pulses propagating in the fiber to shorter wavelengths. Through adjusting the single pulse energy launched into the fiber, the central wavelength of these blueshifting pulses could be continuously tuned over hundreds of nanometers, while maintaining a high energy conversion efficiency of >57%...
December 24, 2018: Optics Express
Ao Yang, Yang He, Shaofei Wang, Xianglong Zeng
A fiber analogue of the optical event horizon is proposed via an Airy-soliton collision. The characteristics of an Airy pulse are demonstrated in a photonic crystal fiber. The robust Airy wave packet is capable of being manipulated by a strong soliton in the frame of the Airy-soliton horizon, leading to various distinctive interaction scenarios. The Airy pulse realizes the temporal reversing and still maintains its features even after undergoing a complete wavelength conversion process. Different comb-like spectra are created in the presence of Raman effect by changing the duration of the Airy pulse...
December 24, 2018: Optics Express
Omer Feinberg, Jonathan Drori, Yuval Rosenberg
In a recent Letter [Opt. Lett.43, 2571 (2018)OPLEDP0146-959210.1364/OL.43.002571], Vengelis et al. have claimed to implement a new experimental technique for measuring the phase refractive index of a photonic crystal fiber mode. Unfortunately, while the experimental effort is appreciated, one of the key assumptions was inaccurate. Taking this error into account reveals that the measured value was the fiber's group index, rather than its phase refractive index.
January 1, 2019: Optics Letters
Erick Lamilla, Maicon S Faria, Ivan Aldaya, Paulo F Jarschel, Julián L Pita, Paulo Dainese
Surface or edge states represent an important class of modes in various photonic crystal systems such as in dielectric topological insulators and in photonic crystal fibers. In the later, strong attenuation peaks in the transmission spectrum are attributed to coupling between surface and core-guided modes. Here, we explore a modified implementation of the spatial and spectral interference method to experimentally characterize surface modes in photonic crystal fibers. Using an external reference and a non-uniform Fourier transform windowing, the obtained spectrogram allows clear observation of anti-crossing behavior at wavelengths in which surface and core modes are strongly coupled...
December 10, 2018: Optics Express
T Schreiber, S Kuhn, G Feldkamp, A Schwuchow, K Schuster, S Hein, R Eberhardt, A Tünnermann
We present the application of a confocal fluorescence microscope to the analysis of Yb-doped solid-state laser materials, with examples of Yb-doped crystals, photonic crystal fibers and fiber preforms made with different manufacturing processes. Beside the fluorescence lifetime image itself, a microscopic spectral fluorescence emission analysis is presented and spatially resolved emission cross sections are obtained. Doping concentration and its distributions and other laser optical parameters are measured, which help to analyze manufacturing steps...
December 10, 2018: Optics Express
Nagarajan Nallusamy, Peng Zu, R Vasantha Jayakantha Raja, N Arzate, D Vigneswaran
A novel magnetic field sensor based on the degenerate four-wave mixing (DFWM) technique is theoretically proposed using a As2 S3 -core silica-cladding photonic crystal fiber (PCF). In order to enhance the sensitivity, we put forth a novel design of highly nonlinear PCF where the silica cladding is doped with either Au, Ag, or Al metallic nanoparticles. The effect of volume fraction of the nanoparticles within the cladding and the size of nanoparticles are considered as the control parameters in designing the magnetic field PCF sensor to obtain high sensitivity using this novel DFWM scheme...
January 10, 2019: Applied Optics
Cailing Fu, Yiping Wang, Zhiyong Bai, Shen Liu, Yan Zhang, Ziliang Li
A novel twist-direction-dependent high-order orbital angular momentum (OAM) generator based on an inflated helical photonic crystal fiber (IHPCF) was demonstrated by use of an inflation-assisted hydrogen-oxygen flame heating technique. Compared with the helical photonic crystal fiber, the IHPCF exhibits a perfect transmission dip without distinct splits, thus generating high-quality OAM±6 modes. The helical phase of the generated OAM modes is dependent on the twist direction of the IHPCF and independent of the polarization state of the input light...
January 15, 2019: Optics Letters
Ling Lu, Haozhe Gao, Zhong Wang
One-way waveguides have been discovered as topological edge states in two-dimensional (2D) photonic crystals. Here, we design one-way fiber modes in a 3D magnetic Weyl photonic crystal realizable at microwave frequencies. We first obtain a 3D Chern crystal with a non-zero first Chern number by annihilating the Weyl points through supercell modulation. When the modulation becomes helixes, one-way modes develop along the winding axis, with the number of modes determined by the spatial frequency of the helix. These single-polarization single-mode and multi-mode one-way fibers, having nearly identical group and phase velocities, are topologically-protected by the second Chern number in the 4D parameter space of the 3D wavevectors plus the winding angle of the helix...
December 19, 2018: Nature Communications
Charles-Henri Hage, Pierre Leclerc, Marc Fabert, Sylvia M Bardet, Julien Brevier, Guillaume Ducourthial, Tigran Mansuryan, Aymeric Leray, Alexandre Kudlinski, Frédéric Louradour
A two-photon fluorescence lifetime (2P-FLIM) microendoscope, capable of energetic metabolism imaging through the intracellular NADH autofluorescence, at sub-cellular resolution, is demonstrated. It exhibits readily usable characteristics such as convenient endoscope probe diameter (≈ 2 mm), fiber length (> 5 m) and data accumulation rate (16 frames per second (fps), leading to a FLIM refreshing rate of ≈ 0.1 to 1 fps depending on the sample) . The spiral scanning image formation does not influence the Instrument Response Function (IRF) characteristics of the system...
December 11, 2018: Journal of Biophotonics
Sully Milena Mejia Quintero, Luiz Carlos Guedes Valente, Marcos Sebastião de Paula Gomes, Hugo Gomes da Silva, Bernardo Caroli de Souza, Sergio R K Morikawa
A realistic implementation of an all-fiber CO₂ sensor, using 74 cm of hollow core photonic crystal fiber (HC-PCF) as the cavity for light/gas interaction, has been implemented. It is based on CO₂ absorbance in the 2 µm region. The working range is from 2% to 100% CO₂ concentration at 1 atm total pressure and the response time obtained was 10 min. Depending on the concentration level, the sensor operates at one of three different wavelengths (2003.5 nm, 1997.0 nm and 1954.5 nm) to maintain a high sensitivity across all the working range...
December 12, 2018: Sensors
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
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
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
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
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
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
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
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