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[IEEE 2019 21st International Conference on Transparent Optical Networks (ICTON) - Angers, France (2019.7.9-2019.7.13)] 2019 21st International Conference on Transparent Optical Networks (ICTON) - Recent Advances in Inhibited-Coupling Guiding Hollow-Core Optical Fibers
摘要： In this talk, we report on recent developments on inhibited-coupling guiding hollow-core optical fibers ranging from the understanding of the guidance mechanism to application fields. We show that a deep understanding of the cladding properties of those fibers allow to obtain fibers with optimized properties. In particular, we demonstrate that, by adequately designing and controlling the fiber physical parameters, one can obtain ultralow loss fibers for the ultraviolet, visible and infrared ranges. Additionally, we show that convenient alterations in the fiber cladding can modify the fiber mode loss hierarchy allowing it to act as a mode shaper, and polarization discriminator.
关键词： hollow-core fibers,fiber optics,photonic-crystal fibers
更新于2025-09-12 10:27:22
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AIP Conference Proceedings [AIP Publishing INTERNATIONAL CONFERENCE ON INVENTIVE MATERIAL SCIENCE APPLICATIONS : ICIMA 2019 - Coimbatore, India (25–26 September 2019)] INTERNATIONAL CONFERENCE ON INVENTIVE MATERIAL SCIENCE APPLICATIONS : ICIMA 2019 - 2-D hollow core photonic crystal fiber-type absorption layer for enhancement of efficiency and broad response in multi-junction solar cell
摘要： We present a numerical based approach to design a new 2-D hollow core photonic crystal (2-D HCPC) structure of hexagonal lattice arrangement with circular air holes on an Indium Tin Oxide (ITO) slab. We used this structure as an anti-re?ective coating (ARC) layer on top of a multi-junction (GaP/InP/Si) solar cell. Apart from the ARC layer a GaAs PhC as back re?ector (BR) is used in the MJSC structure. A unique approach by blending light trapping structures to enhance solar cell e?ciency and light harvesting capabilities for wavelength beyond 750 nm is the goal of the present work. Under AM1.5G condition, the simulation results of the 2-D HC-PC structure as an absorption layer when incorporated on the MJSC structure led to an improvement of 6.38% in cell e?ciency over the previously reported by the conventional/non-photonic MJSC structure. The absorption spectral response using the 2-D HCPC pattern on ITO as ARC on the MJSC is achieved beyond 1000 nm. An optimization study is also carried out by using InAs as core of the 2-D HCPC structure which resulted to an enhancement of cell e?ciency by 9.34% as compared to the conventional/non-photonic MJSC structure.
关键词： efficiency enhancement,2-D hollow core photonic crystal,anti-re?ective coating,multi-junction solar cell,light trapping
更新于2025-09-12 10:27:22
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[IEEE 2019 22nd International Conference on Electrical Machines and Systems (ICEMS) - Harbin, China (2019.8.11-2019.8.14)] 2019 22nd International Conference on Electrical Machines and Systems (ICEMS) - Graphene/Gold Based Photonic Crystal Fiber Plasmonic Temperature Sensor for Electric Vehicle Applications
摘要： An octagonal photonic crystal fiber (PCF) based surface plasmon resonance (SPR) temperature sensor is proposed where graphene/gold and ethanol are used as a plasmonic material and sensing medium, respectively. The proposed PCF based SPR temperature sensor is numerically simulated by finite element method (FEM) based simulation tool and result is processed by using MATLAB environment. Numerical results indicate that the proposed temperature sensor shows the possible maximum wavelength/temperature sensitivity of 1450 pm/oC for graphene plasmonic and 2500 pm/oC for gold plasmonic, calculated using wavelength interrogation method. It is anticipated that the proposed SPR temperature sensor can be reliably applied to monitor the temperature of battery used for electric vehicles (EVs), transformer oil etc.
关键词： temperature sensor,gold,surface plasmon resonance,photonic crystal fiber,electric vehicles,graphene
更新于2025-09-12 10:27:22
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Development of Highly Reliable SERS‐active Photonic Crystal Fiber Probe and its Application in the Detection of Ovarian Cancer Biomarker in Cyst Fluid
摘要： Conventionally Surface enhanced Raman spectroscopy (SERS) is realized by adsorbing analytes onto nano-roughened planar substrate coated with noble metals (silver or gold) or their colloidal nanoparticles (NPs). Nano scale irregularities in such substrates/NPs could lead to SERS sensors with poor reproducibility and repeatability. Herein, we demonstrate a suspended core photonic crystal fiber (PCF) based SERS sensor with extremely high reproducibility and repeatability in measurement with a relative standard deviation of only 1.5% and 4.6% respectively, which makes it more reliable than any existing SERS sensor platforms. In addition, our platform could improve the detection sensitivity owing to the increased interaction area between the guided light and the analyte, which is incorporated into the holes that runs along the length of the PCF. Numerical calculation established the significance of the interplay between light coupling efficiency and evanescent field distribution, which could eventually determine the sensitivity and reliability of the developed SERS active-PCF sensor. As a proof of concept, using this sensor, we demonstrated the detection of haptoglobin, a biomarker for ovarian cancer, contained within the ovarian cyst fluid, which facilitated in differentiating the stages of the cancer. We envision that with necessary refinements, this platform could potentially be translated as a next generation highly sensitive SERS-active opto-fluidic biopsy needle for the detection of biomarkers in body fluids.
关键词： reproducibility and repeatability in measurement,Surface enhanced Raman scattering,photonic crystal fiber,biopsy needle,protein sensing,ovarian cancer
更新于2025-09-12 10:27:22
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[IEEE 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS) - Seoul, Korea (South) (2019.1.27-2019.1.31)] 2019 IEEE 32nd International Conference on Micro Electro Mechanical Systems (MEMS) - Engineering and Tuning of Slow Light in Mid-Infrared Silicon-on-Insulator Photonic Crystal Waveguides
摘要： We design, fabricate, and characterize slow light devices based on photonic crystal waveguides (PhCWs) in the mid-infrared wavelength range of 3.9-3.98 μm. Lattice shifting and thermo-optic tuning methods are employed to manipulate the slow light region for potential spectroscopy sensing applications. Up to 20 nm wavelength shift of the slow light band edge is demonstrated. Normalized delay-bandwidth products as high as 0.084-0.112 are obtained thanks to dispersion engineering. The slow light enhancement effect of thermo-optic tuning efficiency is verified by the proportional relationship between the phase shift and the group index. This work serves as a proof-of-concept that slow light effect can strengthen light-matter interaction and thereby improve device performance in sensing and nonlinearity applications.
关键词： thermo-optic tuning,slow light,mid-infrared,dispersion engineering,silicon-on-insulator,photonic crystal waveguides
更新于2025-09-12 10:27:22
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Three-dimensional macroporous photonic crystal enhanced photon collection for quantum dot-based luminescent solar concentrator
摘要： A luminescent solar concentrator (LSC) is a photon managing device that can harvest, direct and concentrate solar light to small areas, enabling subsequent coupling to photovoltaic devices (PVs) for enhanced solar energy conversion. However, the intrinsic photon loss through the so-called escape cone of the LSCs significantly limits their light harvesting and concentrating performance. In this work, we introduce a facile and low-cost approach for the fabrication of a three-dimensional (3D) macroporous photonic crystal (PC) filter as an efficient photon reflector, which can be coated onto quantum dot (QD) based LSC devices. We demonstrate that by controlling the PC reflection band to match the emission profile of the QD emitters, the light trapping efficiency of the PC coated LSC (PC-LSC) can be significantly improved from 73.3% to 95.1% as compared to the conventional PC-free LSC due to the reduced escape cone photon loss. In addition, we have developed a simulation model that considers the PC reflector effect. Both experimental and simulation results show that the enhancement in LSC device performance induced by the PC reflector increases with increasing dimension. In fact, simulation data predicts a maximum of 13.3-fold enhancement in external quantum efficiency (EQE) and concentration factor (C factor) of the PC-LSC under more ideal conditions. Moreover, the simulation result offers insight into the relationship between photon output efficiencies and the geometric design of the PC-LSC. Our study sheds light on future design and fabrication of LSC devices with enhanced photon collection and concentrating efficiencies through novel and wavelength-selective photon reflectors.
关键词： Solar energy,Escape cone loss,Photonic crystal,Luminescent solar concentrator,Quantum dots
更新于2025-09-12 10:27:22
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[ACM Press the Sixth Annual ACM International Conference - Dublin, Ireland (2019.09.25-2019.09.27)] Proceedings of the Sixth Annual ACM International Conference on Nanoscale Computing and Communication - NANOCOM '19 - Graphene epsilon-near-zero plasmonic crystals
摘要： Plasmonic crystals are a class of optical metamaterials that consist of engineered structures at the sub-wavelength scale. They exhibit optical properties that are not found under normal circumstances in nature, such as negative-refractive-index and epsilon-near-zero (ENZ) behavior. Graphene-based plasmonic crystals present linear, elliptical, or hyperbolic dispersion relations that exhibit ENZ behavior, normal or negative-index diffraction. The optical properties can be dynamically tuned by controlling the operating frequency and the doping level of graphene. We propose a construction approach to expand the frequency range of the ENZ behavior. We demonstrate how the combination of a host material with an optical Lorentzian response in combination with a graphene conductivity that follows a Drude model leads to an ENZ condition spanning a large frequency range.
关键词： plasmonics,photonics,metamaterials,Graphene,photonic crystal
更新于2025-09-12 10:27:22
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Red Emitting InGaN‐Based Nanocolumn LEDs with Highly Directional Beam Profiles
摘要： We demonstrated a red emitting (λ = 637 nm) nanocolumn LED with highly directional beam profiles. The radiation angle of the red nanocolumn LED was approximately ±30°, which is narrower than that of ordinary planar-type LEDs. Such excellent emission characteristics caused by the photonic crystal effect will provide a key technology for applications of nanocolumn micro-LEDs in displays.
关键词： light-emitting diode,nanostructure,nitride,photonic crystal
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Generation of Broad-Band Circularly Polarised Supercontinuum in Chiral Photonic Crystal Fibre
摘要： Supercontinuum (SC) generation in solid-core photonic crystal fibres (PCFs) is well established and has diverse applications in science and technology [1,2]. In a conventional SC, the polarization state is not maintained over the whole spectrum due to cross-phase modulation and may in addition vary with power. Recently, it has been reported that continuously twisted PCFs exhibit circular birefringence [3,4]. Here we report the first experimental demonstration of a twisted PCF that robustly maintains circular polarization state across the whole spectrum, independent of power.
关键词： Supercontinuum generation,chiral light-matter interactions,photonic crystal fibres,circular polarization
更新于2025-09-12 10:27:22
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Reconstruction of Guided Helical Bloch Modes in Twisted Coreless Photonic Crystal Fibre using Bessel Beams
摘要： Light beams carrying orbital angular momentum (OAM) are of fundamental interest in many fields of research. Recently it has been reported that helical Bloch modes (HBMs) carrying multiple values of OAM are guided in chirally twisted photonic crystal fibre (PCF), even when there is no core. HBMs are not supported by conventional waveguides and would be very difficult to realise using multi-beam interference. Here we report the first complete experimental characterisation of the phase and amplitude of the complex HBM fields in twisted coreless PCF. We compare the measurements with finite element simulations, based on precise scanning electron micrographs of the fibre structure, obtaining excellent agreement. We then expand the numerically calculated HBM fields as a series of Bessel beams, allowing us to calculate the strengths and azimuthal orders of the HBM harmonics with a fidelity greater than 95%.
关键词： Bessel beams,helical Bloch modes,orbital angular momentum,photonic crystal fibre
更新于2025-09-12 10:27:22