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- 实验方案
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[IEEE 2018 IEEE 15th International Conference on Group IV Photonics (GFP) - Cancun (2018.8.29-2018.8.31)] 2018 IEEE 15th International Conference on Group IV Photonics (GFP) - Photonic Bonding Modes with Circular Polarization at Zero-Group-Velocity Points
摘要： Breaking the parity symmetry of a photonic crystal waveguides can lead to the bonding of guided modes with orthogonal dominant polarizations. Here we present how this coupling allows anomalous zero-group-velocity and prominent circular polarization to emerge, which can be used to enhance uni-directional photon emission. confined aZGV points along with circular polarization points in high field intensity region. Fabricated devices in Silicon-On-Insulator (SOI) wafer confirms modes coupling and an extremely large slow-down factor[11]. This paradigm opens the way for designing outclass chiral quantum photonics circuit.
关键词： photonic crystal waveguides,circular polarization,zero-group-velocity
更新于2025-09-23 15:22:29
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Highly Dispersion Tailored Property of Novel Class of Multimode Surface Plasmon Resonance Biosensor Assisted by Teflon and Metamaterial Layers
摘要： In this paper, we describe a novel dispersion tailored properties of surface plasmon resonance (SPR) sensor assisted by Te?on and metamaterial layers. The dispersion property and the excitation methods of surface plasmon (SP) waves have been great signi?cance in sensor design. Most of the time, SPR sensor designed for biosensing has been dual mode and its side lobes in dispersion graph can signi?cantly reduce the sensitivity. We propose a design of as many as ?ve-mode SP sensor assisted by Te?on and metamaterial layers. A new sensing theory for exploring highly dispersion tailored properties of multilayer sensor structure is design for ef?cient biorecognition. The proposed design scheme is able to completely remove the side lobes in the dispersion graph by properly controlling the Te?on layer, thin gold ?lm, and metamaterial thickness for the case of multimode SPR sensor. To the best of our knowledge, dispersion tailored properties of multimode SP sensor assisted by Te?on and metamaterial layers together have not been explored and analyzed. The standard matrix method is applied to calculate the various performance parameters of the sensor. Experimental validation has been done with available results for a speci?c case.
关键词： matrix method,re?ectance,metamaterial,Te?on layer,Group velocity dispersion (GVD)
更新于2025-09-23 15:22:29
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Dispersion characteristics of terahertz transverse electric mode in a smooth-wall cylindrical waveguide with a degenerate plasma layer
摘要： The propagation of transverse electric mode in a cylindrical metallic smooth-wall waveguide contains a dielectric rod and a cold collisionless unmagnetized degenerate plasma layer is analytically investigated in the terahertz frequency region. The dispersion relations of fast and slow waves for this mode are derived and solved numerically. The effects of geometrical and physical parameters such as dielectric, plasma and metal radii, and dielectric permittivity on the dispersion characteristics of terahertz transverse electric mode and its frequency spectrum are studied. It is shown that the decrease of dielectric permittivity and metal radius, and the increase of degenerate plasma radius leads to higher frequency fast waves. It is also indicated that an increase in the dielectric radius results in a decrease in the frequency of fast waves. In addition, it is found that by reducing the dielectric rod radius and with increasing metal radius, the frequency is increased in the slow waves. Finally, it is shown that the increase in dielectric permittivity causes a decrease in the frequency of both fast and slow waves.
关键词： Dielectric layer,Waveguide,Group velocity,Unmagnetized degenerate plasma,Dispersion relation
更新于2025-09-23 15:21:01
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Temperature and hydrostatic pressure effects on the electronic structure, optical properties of spherical segment quantum dot/wetting layer and group velocity of light
摘要： To investigate hydrostatic pressure and temperature effects on electron energy levels of an InAs spherical segment quantum dot with wetting layer embedded in GaAs barrier, we use the finite element method to solve the Schr?dinger equation in the effective mass approximation. Results show that the ground, the first and the second excited state energies decrease (increase) as the hydrostatic pressure (temperature) increases for the constant temperature (pressure). Moreover, given the optical properties of the system interacting with two laser fields, red (blue) shifts are observed in the linear and nonlinear absorptions and dispersions for the probe pulse as the hydrostatic pressure (temperature) increases. Furthermore, as the hydrostatic pressure increases, the maximum of the group velocity of light inside the slow light frequency range increases and the slow light frequency range shifts to the lower probe frequencies.
关键词： temperature,group velocity of light,hydrostatic pressure,optical property,quantum dot/wetting layer
更新于2025-09-23 15:21:01
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Second harmonic generation at 544a??nm of a femtosecond laser
摘要： We study second harmonic generation (SHG) at 544 nm of the 0-type (e + e - e) quasi-phase-matching based on a femtosecond laser at 1088 nm. The green pulse with the spectrum width of 0.6 nm and the peak power of 17.7 kW is obtained at the pump power density of 2.81 GW/cm2 and the conversion e?ciency is 21 %. As the propagation distance along the PPMgLN crystal increases, the spectrum at 544 nm becomes narrower and narrower and the pulse duration broadens very seriously.
关键词： Group velocity match,544 nm laser,Second harmonic generation,PPMgLN,Ultrafast optics,Femtosecond pulses
更新于2025-09-23 15:21:01
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The dispersion behaviors of the tripod-type four-level cylindrical quantum dot under phenomenon of electromagnetically induced transparency
摘要： In this paper, linear and 3rd-order nonlinear group velocities of the probe laser field are investigated in a tripod-type four-level cylindrical quantum dot (TTFLCQD) with parabolic potential in electromagnetically induced transparency. The control lasers at z-polarization are applied to the system and the results are investigated. Also, linear and 3rd-order nonlinear group velocities in z-polarization are compared. The effects of parameters of TTFLCQD and control lasers on linear and 3rd-order nonlinear group velocities are explored. Finally, the results are discussed. The linear and 3rd-order nonlinear group velocities are compared at z-polarization. Furthermore, the effects of parameters of TTFLCQD and control lasers on linear and 3rd-order nonlinear group velocities are explored. Finally, the results are discussed. The linear and 3rd-order nonlinear group velocities are compared at z-polarization. Furthermore, the effects of parameters of TTFLCQD and control lasers on linear and 3rd-order nonlinear group velocities are explored. Finally, the results are discussed.
关键词： Electromagnetically induced transparency,Tripod-type four-level cylindrical quantum dot,Nonlinear group velocity,Linear group velocity,Slow light
更新于2025-09-23 15:19:57
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Regular perturbation on the group-velocity dispersion parameter for nonlinear fibre-optical communications
摘要： Communication using the optical fibre channel can be challenging due to nonlinear effects that arise in the optical propagation. These effects represent physical processes that originate from light propagation in optical fibres. To obtain fundamental understandings of these processes, mathematical models are typically used. These models are based on approximations of the nonlinear Schr?dinger equation, the differential equation that governs the propagation in an optical fibre. All available models in the literature are restricted to certain regimes of operation. Here, we present an approximate model for the nonlinear optical fibre channel in the weak-dispersion regime, in a noiseless scenario. The approximation is obtained by applying regular perturbation theory on the group-velocity dispersion parameter of the nonlinear Schr?dinger equation. The proposed model is compared with three other models using the normalized square deviation metric and shown to be significantly more accurate for links with high nonlinearities and weak dispersion.
关键词： group-velocity dispersion,nonlinear fibre-optical communications,regular perturbation theory,nonlinear Schr?dinger equation
更新于2025-09-23 15:19:57
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Investigating the Dynamics of Intense Pulses Propagating in a Photon Crystal Optical Fiber with a Group Velocity Dispersion Gradient
摘要： The dynamics of soliton-like pulses propagating in a fiber with a group velocity dispersion gradient is studied analytically in the tunnel ionization mode and with forced Raman self-scattering. The these effects are shown to mutually compensate for each other under certain conditions, resulting in signal stabilization.
关键词： group velocity dispersion gradient,signal stabilization,soliton-like pulses,forced Raman self-scattering,tunnel ionization
更新于2025-09-19 17:13:59
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[IEEE 2020 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus) - St. Petersburg and Moscow, Russia (2020.1.27-2020.1.30)] 2020 IEEE Conference of Russian Young Researchers in Electrical and Electronic Engineering (EIConRus) - Optical Signal Propagation Simulation in Rectangular Microwaveguides
摘要： The simulation of the optical modes that propagate inside the microwaveguides of a rectangular cross-section was carried out. The impact of geometry of the microwaveguide cross-section on the group velocity of the modes is analyzed. It is demonstrated that the group velocity has a non-linear dependence on a microwaveguide core width. This dependence is determined by the energy redistribution between the core and the cladding of the microwaveguide.
关键词： group velocity,microwave photonics,integrated optics,propagation loss,optical microwaveguides
更新于2025-09-19 17:13:59
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[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) - Dispersion and Ridge Width Effect in Terahertz Quantum Cascade Laser Combs
摘要： We systematically investigate the laser ridge width effect on comb operation of single plasmon waveguide quantum cascade lasers emitting around 4.2 THz. The total group velocity dispersion (GVD), including gain, waveguide, and material dispersions, is numerically evaluated for 6-mm-long lasers with ridge widths varying from 100 to 200 μm. The simulation reveals that the clamped gain dispersion strongly contributes to the total GVD and the laser with a 150-μm-wide ridge shows the flattest total GVD in the lasing range between 4.05 and 4.35 THz. The optimal ridge width of 150 μm for comb operation is also experimentally verified.
关键词： group velocity dispersion,frequency comb,quantum cascade laser,ridge width,terahertz
更新于2025-09-16 10:30:52