- 标题
- 摘要
- 关键词
- 实验方案
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A Tunable Optimized Low-Temperature Sensor Based on the Hybrid Photonic Crystals (F4/Bg5/F4) and (Bg5/F4/Bg5)
摘要： In this paper, we present a novel type of low-temperature sensor based precisely on the symmetrical hybrid photonic crystals. Thanks to the two-fluid model and the transfer matrix method, we study the temperature sensitivity of the hybrid multilayers (F4/Bg5/F4) and (Bg5/F4/Bg5) where F4 represents the fourth iteration of the quasi-periodic Fibonacci sequence and Bg5 designates the multilayer Bragg mirror (HLS)5. We assume that the layers H, L, and S indicate precisely the dielectric materials of Bi4Ge3O12, SiO2, and YaBO2CuO7 superconductor one. The analysis of the transmittance spectra shows that the hybrid photonic crystal is more sensitive to the temperature than the periodic one. A higher sensibility value is reached due to the possible combination of the periodic and quasi-periodic sequences. Our investigation reveals that the photonic crystal (F4/Bg5/F4) is more sensitive to low temperature compared to (Bg5/F4/Bg5). The sensitivity is significantly affected by the position of quasi-periodic sequences. The sensitivity of such photonic crystals can be adequately controlled by applying a symmetrical chirping. The designed structures pave the way toward the achievement of a potential low-temperature sensor.
关键词： Low-temperature sensor,Tunable,Fibonacci,Photonic crystals,Chirped,TMM,Optimization
更新于2025-09-23 15:22:29
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[IEEE 2018 UKSim-AMSS 20th International Conference on Computer Modelling and Simulation (UKSim) - Cambridge, United Kingdom (2018.3.27-2018.3.29)] 2018 UKSim-AMSS 20th International Conference on Computer Modelling and Simulation (UKSim) - A Multiple Quantum Well Structure Simulator
摘要： A simulator was developed for modeling and designing multiple quantum wells structures such as quantum well infrared photodetectors and quantum cascade laser, based on a single-electron effective mass Schr?dinger equation. It employs box integration finite differences and transfer matrix approaches to find energies of bound and scattering states in the structures. The graphical user interface allows the user to vary easily design parameters including effective mass, layer thickness and number of layers as well as simulation parameters in order to optimize the structure for different device applications and functionality. Three simulation examples were performed on: three coupled quantum wells infrared two-color asymmetric quantum well structure, photodetector structure and on a quantum cascade laser design. The results show an accuracy which is comparable to more complicated simulations.
关键词： Effective mass approximation,TMM,Multiple Quantum Wells Structures,FDM
更新于2025-09-23 15:22:29
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Optical filtering devices in SiO2/AlGaAs superlattice structures
摘要： In this work, the properties of the photonic bandgap (PBG) and Omni-directional photonic bandgap (Omni-PBG) of a quasi-one-dimensional photonic crystal (PC) are studied, in both TE and TM polarization modes. The PC is made of SiO2 and AlxGa1?xAs layers, alternatively, where x is the content of aluminum atoms in the GaAs slab. Using the transfer matrix method (TMM), the calculations are carried out within Maxwell’s equation framework, to express the magnetic field of each medium in terms of electric. This model reduces the numerical calculation time and enables us to investigate the PBG and the Omni-PBG properties in the superlattices. We show that by varying the content and geometrical parameters, one can easily block the transmittance of the electromagnetic wave in the PC. The numerical results may be useful in designing of optical filtering nano-devices.
关键词： Omni-directional photonic bandgap (Omni-PBG),Photonic crystal (PC),Photonic bandgap (PBG),Transfer matrix method (TMM)
更新于2025-09-23 15:21:21
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The Optical Properties of Metamaterial-Superconductor Photonic Band Gap With/Without Defect Layer
摘要： In the present work, we have investigated theoretically the optical properties of a new one-dimensional defected photonic crystal structure (1DDPC). The structure is composed of alternating layers of metamaterial (double-negative material) and high Tc superconductor material called Hg1223 defected with a dielectric material (SiO2) at the center of the structure. The transmittance spectra of the proposed structure are obtained by using the transfer matrix method (TMM). We noticed that multiple transmittance peaks within the photonic band gap (PBG) as the thickness of defect layer increases. The tunable filtering feature is obtained by varying the thicknesses of metamaterial and superconductor layer. In addition, the defect peak is red shifted as well as photonic band gap tuned to low-frequency region. Our structure is sensitive to the variation of the angle incidence. Also, defect mode shown to be blue shifted as the angle of incidence increases. The tunable filtering properties are very useful in the optoelectronic applications.
关键词： Metamaterial,Photonic band gap,TMM,Superconductor
更新于2025-09-23 15:21:01