- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Paris, France (2019.9.1-2019.9.6)] 2019 44th International Conference on Infrared, Millimeter, and Terahertz Waves (IRMMW-THz) - Research of Volume Free-Electron Laser with Photonic Crystal Structure for Operation in Sub-Terahertz Range
摘要： In this work, we present the results of the numerical optimization of volume free-electron laser based on the interaction between an electron beam and periodic structure of microwave photonic crystal. The optimization aims at the advancement of such device to the sub-terahertz frequency range. We show that the reduction of characteristic geometric dimensions allows increasing the working frequency of photonic crystal fundamental mode up to 12.5 GHz. Moreover, we observe the possibility to generate microwaves at the fifth harmonic of the fundamental frequency, namely f=62.5 GHz and obtain an output power level of about 3.6 kW.
关键词： electron beam,numerical optimization,sub-terahertz,volume free-electron laser,photonic crystal
更新于2025-09-16 10:30:52
-
Amphibious sensor of temperature and refractive index based on D-shaped photonic crystal fibre filled with liquid crystal
摘要： A D-shaped photonic crystal fibre filled with liquid crystal was demonstrated as an amphibious sensor for detection of both temperature and refractive index, when combined with plasma materials. Specifically, the optical component is implanted into a complete optical system ensuring modulation of the external electric field. When the refractive index of the external solution changes from 1.0 to 1.6, the y-polarised mode has a loss spectrum with a wavelength sensitivity of up to 2275 nm/RIU, and the corresponding amplitude sensitivity is ?88.2RIU?1. When the perceived temperature changes from 15°C to 50°C, the temperature of the sensor is correspondingly expressed as the maximum wavelength sensitivity of 9.09 nm/°C and the amplitude sensitivity of ?0.311°C?1. In addition, the actual micro-operation processes have been studied in detail, such as polishing depth, coating thickness and coating method. This provides practical ideas for real-time sensing analysis that requires harsh environments.
关键词： surface plasmon resonance,sensitivity,Fibre optics sensors,photonic crystal fibre
更新于2025-09-16 10:30:52
-
[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) - Continuum Generation in Higher-Order Modes of Photonic Crystal Fibers
摘要： Low-noise supercontinuum (SC) generation in photonic crystal ?bers (PCFs) can be achieved by using pump pulses of femtosecond (fs) duration and low soliton numbers [1]. The small cores sizes needed to obtain anomalous dispersion for pump wavelengths in the Yb gain band (typically 1030-1070 nm) implies a severe restriction on power for such pump pulses. One possible strategy for power scaling is to pump in higher-order ?ber modes, which can attain the desired dispersion properties in larger cores. This contribution aims to explore the properties of such continua, in particular the conditions necessary to retain a single-mode character of the output.
关键词： nonlinear mode coupling,photonic crystal fibers,higher-order modes,supercontinuum generation
更新于2025-09-16 10:30:52
-
[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) - Photonic Crystal Fiber Infiltrated with Carbon Tetrachloride for Supercontinuum Generation
摘要： Supercontinuum generation in a hollow core photonic crystal fiber infiltrated with carbon tetrachloride was verified numerically and experimentally with femtosecond laser. Carbon tetrachloride (CCl4) infiltrated core of photonic crystal fiber (PCF), as well as other liquid core PCFs, have a large potential for supercontinuum (SC) generation, because they can combinate the unique properties of PCFs, i.e. modify dispersion characteristics by the individually changing of photonic cladding parameters of the PCF, optimize effective mode area and control mode properties, with high nonlinearity of liquid as a core medium. Moreover, using liquid core PCFs for SC generation can reduce requirements on high peak power and complexity of pump laser systems [1]. Carbon tetrachloride is one of the most interesting liquid in this area because it has very high nonlinear refractive index n2 = 1.53*10-19 (m2/W) @ λ=1.064 μm [2], it is highly transparent from visible range to mid-infrared (MIR) [3], and its linear refractive index is similar to silica – therefore development of single mode fibers compatible with standard silica fibers is feasible. Therefore, carbon tetrachloride core PCFs gives a large opportunities to obtain the broadband SC generation in infrared.
关键词： femtosecond laser,photonic crystal fiber,carbon tetrachloride,supercontinuum generation
更新于2025-09-16 10:30:52
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Enhanced Magneto-Optical Effects in Magnetic Photonic Crystal Fiber Based on Yttrium Iron Garnet
摘要： In this paper, a kind of magnetic photonic crystal fiber of Yttrium iron garnet (YIG) is presented. The influence of gyrotropy on TE-TM mode conversion is analysed, which depends on Faraday rotation. The structure parameters are simulated and optimized. The optimum efficiency of 93.57% is obtained. Faraday rotation and modal birefringence have been calculated by varying gyrotropy from 0.01 to 0.04. The numerical results reveal an increased Faraday rotation and a reduced modal birefringence of 10-5. The enhanced properties of the structure could improve photonic devices performance, which make it suitable for magneto-optical isolators.
关键词： Modal birefringence,Faraday rotation,YIG,Magnetic photonic crystal fiber,Mode conversion
更新于2025-09-16 10:30:52
-
[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) - Wideband Graphene Electro-Optic Modulator on 1D Photonic Crystal Cavity
摘要： Since the isolation of graphene monolayers in 2004, attention has turned to embedding this 2D material into optical components such as modulators, frequency convertors and optical clocks. Indeed, graphene exhibits some remarkable optical properties such as wideband optical absorption in both normal-incidence (free-space applications) and grazing-incidence (waveguide based applications), intrinsic supporting of surface plasmon polariton (SPP) waves, and a full catalogue of non-linear optical behaviors including saturable absorption and multiple-photon mixing phenomena. These optical properties can be activated and deactivated for a given free space wavelength by “doping” graphene using the same gating techniques developed for solid state electronics; for example, in the case of absorption modulation, one must shift the Fermi level such that its separation from the Dirac point in energy (called the chemical potential) is equal to at least half the photon energy in order to render graphene transparent. Nonetheless, as an atomically thin monolayer, graphene’s limited interaction with light in free space restricts its absorption to 2.3% across a wide spectral range for undoped samples.
关键词： electro-optic modulator,graphene,wideband,photonic crystal cavity
更新于2025-09-16 10:30:52
-
-1-5753907Highly Sensitive Plasmonic Sensor Based on a Dual-Side Polished Photonic Crystal Fiber for Component Content Sensing Applications
摘要： A plasmonic sensor based on a dual-side polished photonic crystal fiber operating in a telecommunication wavelength range is proposed and investigated numerically by the finite element method (FEM). We study the effects of structural parameters on the sensor’s performance and analyze their tuning effects on loss spectra. As a result, two configurations are found when the analyte refractive index (RI) changes from 1.395 to 1.415. For configuration 1, an RI resolution of 9.39 × 10?6, an average wavelength sensitivity of 10,650 nm/RIU (the maximum wavelength sensitivity is 12,400 nm/RIU), an amplitude sensitivity of 252 RIU?1 and a linearity of 0.99692 are achieved. For configuration 2, the RI resolution, average wavelength sensitivity, amplitude sensitivity and linearity are 1.19 × 10?5, 8400 nm/RIU, 85 RIU?1 and 0.98246, respectively. The combination of both configurations can broaden the wavelength range for the sensing detection. Additionally, the sensor has a superior figure of merit (FOM) to a single-side polished design. The proposed sensor has a maximum wavelength sensitivity, amplitude sensitivity and RI resolution of the same order magnitude as that of existing sensors as well as higher linearity, which allows it to fulfill the requirements for modern sensing of being densely compact, amenable to integration, affordable and capable of remote sensing.
关键词： fiber design,surface plasmon resonance,photonic crystal fiber,sensor
更新于2025-09-16 10:30:52
-
Exploiting long-range disorder in slow-light photonic crystal waveguides
摘要： The interplay between order and disorder in photonic lattices opens up a wide range of novel optical scattering mechanisms, resonances, and applications that can be obscured by typical ordered design approaches to photonics. Striking examples include Anderson localization, random lasers, and visible light scattering in biophotonic structures such as butterfly wings. In this work, we present a profound example of light localization in photonic crystal waveguides by introducing long-range correlated disorder. Using a rigorous three-dimensional Bloch mode expansion technique, we demonstrate how inter-hole correlations have a negative contribution to the total out-of-plane radiative losses, leading to a pronounced enhancement of the quality factor, Q, and Q/V cavity figures of merit in the long-range correlation regime. Subsequently, the intensity fluctuations of the system are shown to globally increase with the correlation length, highlighting the non-trivial role of long-range disorder on the underlying scattering mechanisms. We also explore the possibility of creating ultra-high quality cavity modes via inter-hole correlations, which have various functionalities in chip-based nonlinear optics and waveguide cavity-quantum electrodynamics.
关键词： Long-Range Correlations,Photonic Crystal Waveguides,Slow Light,Disordered photonics,Anderson Localization
更新于2025-09-16 10:30:52
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Supercontinuum Generation in Cascaded Photonic Crystal Fiber Tapers
摘要： In this paper, we propose two-stage cascaded photonic crystal fiber tapers for the supercontinuum (SC) generation. The nonlinear evolution of the SC generation is numerically investigated when pump pulses with different peak powers are used.
关键词： supercontinuum generation,Nonlinear,photonic crystal fiber taper
更新于2025-09-16 10:30:52
-
Tm/Al co-doped silica glass prepared by laser additive manufacturing technology for 2 μm photonic crystal fiber laser
摘要： In this work, we demonstrated the Tm/Al co-doped silica glass fabricated by the laser additive manufacturing technology for the first time. The measurements show that the glass was doped with Tm3+ concentration of 1.64 wt% without any crystallization. The Tm3+ and Al3+ were uniformly distributed and no additional defects were introduced during the fabrication process. The glass exhibits low hydroxyl content level of 11.56 ppm. Using the prepared silica glass as the core rod, a Tm/Al co-doped photonic crystal fiber (PCF) was fabricated and performed 13.9 % slope efficiency with nearly 600 mW output laser power. This novel technology provides an alternative method to fabricate Tm-doped fiber materials with high homogeneity and large core size, promoting the further spread and development of 2 μm fiber lasers.
关键词： Tm-doped fiber,silica glass,laser additive manufacturing,photonic crystal fiber
更新于2025-09-16 10:30:52