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Determination of refractive index using surface plasmon resonance (SPR) and rigorous coupled wave analysis (RCWA) with a D-shaped optical fiber and a nano-gold grating
摘要： A D-shaped optical-fiber refractive index sensor based on surface plasmon resonance is reported. Rigorous coupled-wave analysis was used to simulate the numerical modeling. The influences of different metal grating parameters on the coupling efficiency were studied and an optimal phase match was obtained. The results show that wavelength sensitivity of the proposed optical fiber sensor is as high as 0.925 lm/RIU for refractive index values from 1.35 to 1.43 with a high linearity value of 0.997. The reported structure may promote the development of high-performance biochemical sensing devices.
关键词： metal grating,D-shaped optical fiber,surface plasmon resonance,sensor,rigorous coupled-wave analysis
更新于2025-09-23 15:19:57
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A Refractive Index Sensor Based on H-Shaped Photonic Crystal Fibers Coated with Ag-Graphene Layers
摘要： An Ag‐graphene layers‐coated H‐shaped photonic crystal fiber (PCF) surface plasmon resonance (SPR) sensor with a U‐shaped grooves open structure for refractive index (RI) sensing is proposed and numerically simulated by the finite element method (FEM). The designed sensor could solve the problems of air‐holes material coating and analyte filling in PCF. Two big air‐holes in the x‐axis produce a birefringence phenomenon leading to the confinement loss and sensitivity of x‐polarized light being much stronger than y‐polarized. Graphene is deposited on the layer of silver in the grooves; its high surface to volume ratio and rich π conjugation make it a suitable dielectric layer for sensing. The effect of structure parameters such as air‐holes size, U‐shaped grooves depth, thickness of the silver layer and number of graphene layers on the sensing performance of the proposed sensor are numerical simulated. A large analyte RI range from 1.33 to 1.41 is calculated and the highest wavelength sensitivity is 12,600 nm/RIU. In the linear RI sensing region of 1.33 to 1.36; the average wavelength sensitivity we obtained can reach 2770 nm/RIU with a resolution of 3.61 × 10?5 RIU. This work provides a reference for developing a high‐sensitivity; multi‐parameter measurement sensor potentially useful for water pollution monitoring and biosensing in the future
关键词： H‐shaped optical fiber,graphene,liquid refractive index,photonic crystal fibers,surface plasmon resonance
更新于2025-09-19 17:13:59
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[IEEE 2019 IEEE Colombian Conference on Communications and Computing (COLCOM) - Barranquilla, Colombia (2019.6.5-2019.6.7)] 2019 IEEE Colombian Conference on Communications and Computing (COLCOM) - Ultrashort Pulse Generation in EDFL Cavities using Graphene as Saturable Absorber for applications in optical communications systems
摘要： Graphene and 2D materials are being used in the design of light sources due to their wide absorption spectrum, ultrafast recovery time and high modulation depth. In this work, we present a experimental design of an modelocking Erbium-Doped-Fiber-Laser (EDFL) that uses graphene deposited onto D-shaped optical fiber, acting as a saturable absorber, in order to generate ultra-short pulses in an important region for optical communications: 1558.5 nm. To best of our knowledge, this is the first ultrashort pulses laser designed an experimentally validated in Colombia. The results shows a pulsed laser with a repetition rate of 33.3 MHz and a spectral width of 10 nm.
关键词： Saturable absorber,Graphene,Erbium-doped-fiber-laser,Mode-locking,D-shaped Optical fiber,Ultrashort pulses
更新于2025-09-16 10:30:52
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Surface Plasmon Resonance Sensor Based on D-Shaped Optical Fiber Using Fiberbench Rotating Wave Plate for Sensing Pb Ions
摘要： In this paper, a D-shaped optical fiber is presented in terms of sensor application using FiberBench rotating wave plate. The designed sensor was adopted to detect plumbum ions in aqueous medium using surface plasmon resonance (SPR). The fiber-based SPR sensor was designed using a bilayer sensor chip. The polished area of the D-shaped optical fiber was coated by reduced graphene-based maghemite nanocomposite+1-ethyl-3-(3-dimethylaminopropyl)-carbodiimidehydrochloride/N-hydroxysuccinimide as a sensing layer. The transmission response curves were investigated according to the wavelength and intensity shifts at different concentrations. By incorporating the sensing layer, Pb2+ can be easily detected by wavelength and intensity interrogation methods. The sensor exhibited a recognizable intensity shift at 0.3 ppb Pb ion concentration. The limit of detection due to wavelength shift was 1 ppm. The sensitivity of the Pb ion concentration was 0.116 nm/ppm, and the accuracy was 19.1×10?4. FiberBench rotating wave plate was used to control the depth and the width of the transmission curve using SPR. The outcome of the developed sensor revealed a high accuracy, high sensitivity, and real-time sensor in a static water environment.
关键词： Plumbum ion,nanocomposite,reduced graphene,FiberBench,SPR,polarization controller,D-shaped optical fiber
更新于2025-09-12 10:27:22