- 标题
- 摘要
- 关键词
- 实验方案
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Broadband light-trapping enhancement of graphene absorptivity
摘要： Low optical absorptivity of graphene limits the quantum efficiency of graphene-based optoelectronic devices. We demonstrate a broadband enhancement of absorptivity in an architecture of graphene intercalation inside a simple-cubic woodpile photonic crystal. Significant light-trapping effect is achieved due to spectrally broad and dense resonances in the architecture, especially modes propagating nearly parallel to the interface between the photonic crystal and the background material. We demonstrate an overall absorptivity ～10 to 17 times larger than the free-standing bare graphene monolayer with bandwidth to central frequency ratio 0.3, and ～5 to 11 times larger with bandwidth to central frequency ratio 1.33. A distributed intercalation of three graphene monolayers proves a ～70% overall absorptivity with bandwidth to central frequency ratio 0.3.
关键词： absorptivity,broadband enhancement,graphene,light trapping,photonic crystal
更新于2025-09-23 15:23:52
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Highly sensitive temperature sensor based on Sagnac interferometer with liquid crystal photonic crystal fibers
摘要： We propose and investigate a temperature sensor based on Sagnac interferometer with liquid crystal (LC) photonic crystal fiber (PCF) by finite element method (FEM). LC E7 which is anisotropic under electrical field is designed to be infiltrated into the cladding air holes of PCF. The birefringent PCF is then launched into a Sagnac interferometer. The interference spectrum of the Sagnac interferometer is influenced by the thermal effect of LC E7 and thus could be used to measure the temperature. The simulation results show that the temperature measuring sensitivity and resolution reach to 15 nm/K and 6.7E?4 K in the range of 290–320 K. The measuring range and sensitivity could be modified further by optimizing the PCF structure parameters.
关键词： Temperature sensor,Liquid crystal,Sagnac interferometer,Photonic crystal fiber
更新于2025-09-23 15:22:29
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[IEEE 2018 2nd International Conference on Data Science and Business Analytics (ICDSBA) - Changsha, China (2018.9.21-2018.9.23)] 2018 2nd International Conference on Data Science and Business Analytics (ICDSBA) - Design and Simulation of AlGaAs/InGaAs/GaAs Based Pseudomorphic HEMT Using SILVACO ATLASTM
摘要： In this paper, we have designed and observed the characteristics of a photonic crystal (PC) based optoelectronic device with a specific structure. The device is fabricated using standard semiconductor processes and characterized for its optical and electrical properties. The results show promising performance for applications in data communication.
关键词： data communication,optoelectronic device,photonic crystal,semiconductor process
更新于2025-09-23 15:22:29
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Simultaneously achieving a large negative dispersion and a high birefringence over Er and Tm dual gain bands in a square lattice photonic crystal fiber
摘要： We proposed a novel photonic crystal fiber composed of a double-cladding square lattice that could be used in dual-band, Er and Tm optical gain bands, simultaneously supporting a large negative dispersion and a high birefringence. We theoretically investigated the light guiding property through the proposed PCF by using a vectorial finite element method (FEM) with a perfectly matched layer (PML). By optimizing the structural parameters, we obtained an ultra-large negative dispersion of -20,186ps/(nm?km) and a very high birefringence of 9.27 ×10-3 at the wavelength of 1.55μm in the Er gain band and a very large negative dispersion of -8,067ps/(nm?km) and a high birefringence of 1.0 ×10-3 at the wavelength of 1.87μm in the Tm band. We further discussed the roles of waveguide parameters on the chromatic dispersion, its slope, and the birefringence of the fiber as well as the mode field diameter. The proposed fiber could be directly applied for dual-band dispersion and polarization control in fiber laser cavities as well as optical communications and sensors in the dual bands.
关键词： Thulium band,Erbium band,Negative dispersion,High birefringence,Photonic crystal fiber
更新于2025-09-23 15:22:29
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Cascaded Two-core PCFs based In-line Fiber Interferometer for Simultaneous Measurement of Strain and Temperature
摘要： A new fiber sensor configuration based on the cascaded in-line fiber interferometers has been proposed and experimentally demonstrated for simultaneous measurement of strain and temperature. In order to make the cascaded in-line interferometers, we used two different types of two-core photonic crystal fibers (TCPCFs) having two cores in the symmetry and asymmetry structures. The TCPCFs have different transmission characteristics owing to the distinct geometric structures of the integrated cores, this causes the different strain and temperature sensitivities and thus the two parameters can be discriminated. The measurement resolutions are achieved to be 11.1 με and 1.10 oC for strain and temperature, respectively, in the 10 pm wavelength resolution.
关键词： Mach-Zehnder interferometer,Two-core photonic crystal fiber,strain and temperature sensor
更新于2025-09-23 15:22:29
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Control of orbital angular momentum of light in optofluidic infiltrated circular photonic crystal fibers
摘要： Orbital angular momentum (OAM) of light has been of great interest to enhance the data transmission capacity in optical communication systems. In this regards, new designs of optical fibers have been developed to transmit OAM modes. Circular photonic crystal fibers (C-PCFs) with an air-core in the center are good candidates for guiding OAM of light. By changing the geometrical parameters of the C-PCFs, one can control the topological charge (l) associated with OAM order. However, practically it is of significant interest to keep the geometrical parameters fixed and control the OAM characteristics by introducing optical fluid into the C-PCF. Therefore, in this paper, we propose for the first time controlling OAM characteristics such as l, dispersion and confinement loss based on optofluidic infiltrated C-PCFs. To this end, optofluidics with various refractive indices are introduced into the first ring of air holes in the cladding and mode characteristics are compared with those of uninfiltrated C-PCF. The results show that the OAM modes can be well controlled in optofluidic-infiltrated C-PCFs over the wavelength range of 1.25-2.0 μm with good dispersion and loss characteristics. Also, the dispersion curve can be flattened when an optical fluid with a proper refractive index is infiltrated into the C-PCF.
关键词： circular photonic crystal fibers,orbital angular momentum,optical fluid,mode control.
更新于2025-09-23 15:22:29
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A Method to Process Hollow-Core Anti-Resonant Fibers into Fiber Filters
摘要： Hollow-Core Anti-Resonant Fiber (HC-ARF) shows promising applications. Nevertheless, there has been a persistent problem when it comes to all-fiber integration due to a lack of HC-ARF-based fiber components. In response to this remaining challenge, we investigate a reliable, versatile and efficient method to convert an HC-ARF into a fiber filter. By locally heating an HC-ARF with a CO2 laser, the fiber structure becomes deformed, and cladding capillaries shrink to produce a thicker wall. This process is analogous to “writing” a new fiber with a thicker wall on the original fiber, resulting in creating new high loss regions in the original transmission bands. Thus, the construction of a fiber filter is realized by “writing” a new fiber on the original fiber. The feasibility of this method is confirmed through experiments, adopting both one- and two-layer HC-ARF. The HC-ARF-based fiber filters are found to have transmission spectra consistent with simulation prediction. Both band pass and band reject fiber filters with more than a 20-dB extinction ratio are obtainable without extra loss. Thus, an in-fiber HC-ARF filter is demonstrated by the CO2 writing process. Its versatile approach promises controlled band selection and would find interesting applications to be discussed.
关键词： fiber filters,anti-resonant,hollow core fibers,fabrication,photonic crystal fibers
更新于2025-09-23 15:22:29
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High Sensitivity Photonic Crystal Fiber Refractive Index Sensor with Gold Coated Externally Based on Surface Plasmon Resonance
摘要： 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. By optimizing the sensor structure, the maximum wavelength sensitivity can reach 11000 nm/RIU and the maximum amplitude sensitivity can reach 641 RIU?1. Due to its high sensitivity, the proposed sensor can be used for practical biological and chemical sensing.
关键词： sensor,surface plasmon resonance,refractive index,finite element method,Photonic crystal fiber
更新于2025-09-23 15:22:29
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[IEEE 2018 Iranian Conference on Electrical Engineering (ICEE) - Mashhad (2018.5.8-2018.5.10)] Electrical Engineering (ICEE), Iranian Conference on - The Proposal of New Fano Structure for Optical Switching Applications
摘要： In this paper, an improved Fano device for optical switching purposes is designed. Proposed structure has better transmission characteristics in terms of quality factor, loss and switching contrast than previous structures announced in the literature. Results show that the Q contrast of the cavities leads to the better performance of the Fano switch.
关键词： Optical Communications,Photonic Crystal,All optical switching,Fano shape spectrume,Fano Structure
更新于2025-09-23 15:22:29
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[IEEE 2018 20th International Conference on Transparent Optical Networks (ICTON) - Bucharest (2018.7.1-2018.7.5)] 2018 20th International Conference on Transparent Optical Networks (ICTON) - Application of the Hollow Core Fiber Ended with Fiber Microlens in the Multiphoton Excitation Setup
摘要： In this paper an ultrathin lensed fiber-optics probe for multiphoton fluorescence endoscopy is presented. The probe is made by attaching a segment of multimode (MM) fiber to the distal end of the hollow core, photonic bandgap fiber (HCPBF) and generating a curved surface at the tip of the MM fiber using a fiber arc fusion splicer the electric arc of a fusion splicer. The curved surface served as a micro fiber-optic lens and focused the exiting light beam. It simultaneously protected the HCF tip against contamination.
关键词： fiber microlens,ultrafast optics,photonic crystal fibers
更新于2025-09-23 15:22:29