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[IEEE 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Kyoto, Japan (2018.7.9-2018.7.13)] 2018 31st International Vacuum Nanoelectronics Conference (IVNC) - Field Emission Properties of a Single Silicon Carbide Nanowire
摘要： A single silicon Carbide(SiC) nanowire was fixed on the tungsten tip by using an electron beam induced deposition technique. The field emission properties of single SiC nanowire driven by DC and pulse have been characterized separately. The results show that the pulse-driven field emission performance of single SiC nanowire is better than the one driven by DC, including the turn-on voltage and the maximum current. An inference is proposed to qualitatively explain the improvement of field emission performance, which assumes the changes of work function on the top of single SiC nanowire due to the different stretching effect of the electrostatic field by two driving mode.
关键词： silicon carbide,in-situ measurement,field emission,pulse driving mode
更新于2025-09-23 15:21:21
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Recent Advances in Multifunctional Sensing Technology on a Perspective of Multi-Sensor System: A Review
摘要： Due to rapid advancement in technology, recently a significant amount of work has been carried out in the field of multi-mode sensor and multifunctional sensor. A single unit of multifunctional sensor provides multiple measurements which eventually reduces the cost of multiple sensors and makes the system compact. Though the risk of sensor failure and reliability of the multifunctional sensor is always imminent, researchers are working out different methods to make the sensor fault tolerant. Multifunctional sensor are getting widespread acceptance in variety of fields. This paper provides a review of recent advances in multifunctional sensor technology in the perspective of multi-sensor system. Different aspects of design and implementation of multifunctional sensor technology has been addressed in this paper. This paper can serve as a basic reading material for students and researchers pursuing research on multifunctional sensor.
关键词： Multi-Mode Sensor,Multi-sensor system,Multifunctional Sensor
更新于2025-09-23 15:21:21
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[IEEE 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) - Espoo, Finland (2018.8.27-2018.9.1)] 2018 12th International Congress on Artificial Materials for Novel Wave Phenomena (Metamaterials) - General Conditions to Realize Exceptional Points of Degeneracy and Applications
摘要： We explore the emergence of exceptional points of degeneracy (EPDs) that denote a coalescence of multiple eigenmodes in coupled-mode structures. We establish the general conditions that lead to observing EPDs of different orders in various coupled systems, either uniform (non-periodic) or periodic. EPDs can be found in lossless systems as well as in systems with gain-loss balance. Also, we provide examples of potential applications of structures with EPDs that help improve the performance of devices, like sensors, oscillators, etc., at microwave and optical frequencies.
关键词： exceptional points of degeneracy,optical frequencies,microwave frequencies,EPDs,gain-loss balance,oscillators,lossless systems,coupled-mode structures,sensors
更新于2025-09-23 15:21:21
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Approximate photonic bandgaps of dielectric-magnetic one-dimensional photonic crystals
摘要： The one dimensional photonic crystals (1DPCs) that have both the permittivity and permeability varying periodically along the same direction are analyzed theoretically using the coupled-mode theory. The approximate band edge frequencies, center frequencies, and the bandgaps are derived for the axial propagation. The results are elegant generalization of the corresponding results of the dielectric 1DPCs. The approximate bandedge frequencies obtained were found to have good agreement with those obtained by the transfer matrix method.
关键词： One-dimensional photonic crystal,Coupled-mode theory,Dielectric-magnetic photonic crystal
更新于2025-09-23 15:21:21
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EFFECT OF SIZE ON SINGLE AND DOUBLE OPTICAL MICROBOTTLE RESONATOR HUMIDITY SENSORS
摘要： An experimental study on the effect of whispering gallery mode (WGMs) on micro-bottle resonator (MBR) and its application on humidity sensing is presented. Different transmission mode spectra observed when the diameter of MBR (Db) change from 130μm to 190μm. The Q-factor for single and double MBRs ware observed > 104 for all cases. The size and number of MBRs effecting Q-factor value which are high Q-factor value for smallest size Db = 130μm for single MBR and Pair-4 (combination of two biggest MBRs Db = 190μm) for double MBRs. Application of single and double MBRs in humidity sensing received various sensing performance. With the highest sensitivity value, linearity >90% and P-value > 10-13 make MBR with diameter 130μm to be the best performance as humidity sensor for all cases. Both single and double MBRs are stable over 60 seconds. Overall, the size of the MBR has been shown to be more important than the quantity of MBRs for humidity sensing. Indeed, double MBRs actually perform worse than single MBRs as humidity sensors.
关键词： Q-factor,Sensitivity,Humidity sensor,Whispering gallery mode,Micro-bottle resonator
更新于2025-09-23 15:21:21
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[Springer Series in Optical Sciences] Fano Resonances in Optics and Microwaves Volume 219 (Physics and Applications) || Light-Tunable Fano Resonance in Metal-Dielectric Multilayer Structures
摘要： Recent progress on Fano resonances exhibited by metal-dielectric multilayer structures is reviewed. The Fano resonance in the multilayer structures is caused by coupling between a surface plasmon polariton mode supported by a metal-dielectric interface and a waveguide mode supported by a system of three dielectric layers. Electromagnetic calculations of attenuated total reflection spectra demonstrate the feasibility of realizing the Fano resonance, and the predicted Fano resonance was indeed observed experimentally. Since the structure is simple, it is easy to add the photofunctionality to the structure. Incorporation of photofunctional dye molecules into the waveguide layer made it possible to tune the Fano resonance by light irradiation.
关键词： Fano resonance,light tuning,surface plasmon polariton,waveguide mode,metal-dielectric multilayer structures
更新于2025-09-23 15:21:21
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[Springer Series in Optical Sciences] Fano Resonances in Optics and Microwaves Volume 219 (Physics and Applications) || Fano-resonant Excitations of Generalized Optical Spin Waves
摘要： While chiral materials possess spin-form wave functions as their eigenmodes, optical spin excitations cannot be obtained solely in chiral materials due to a lack of spin impedances. To date, spin excitation has generally been induced through non-conservative methods, such as circular dichroism or magneto-optical effects. In this chapter, we describe a conservative approach to optical spin excitation and control based on the spin-dependent appearance of Fano resonance. Starting from the development of the spin-form temporal coupled mode theory for 2D and 3D chiral resonances, the origin of the spin-Fano interactions is demonstrated in terms of the link between the spin eigenmodes in the polarization domain and anti-symmetric Fano resonances in the spectral domain. By comparing this spin-dependent Fano-resonant system with other optical spin materials, such as chiral, circular dichroic, and birefringent media, we discuss the impact of our results toward the realization of optical spintronics, such as applications of highly selective spin switching and unpolarized spinning operations.
关键词： Fano resonance,chiral materials,temporal coupled mode theory,optical spin,spintronics
更新于2025-09-23 15:21:21
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Nanoparticle using parallel split rings and implementation of chain for creating Fano resonance with polarization independence for energy harvesting in mid-infrared
摘要： In optical devices, the polarization of the incident wave affects the Nano particle characteristics. Therefore, designing a polarization-independent device is significant in the process of designing optical structures. On the other hand, the concept of Fano resonance and dark mode has been utilized for achieving more energy enhancement. In this paper, we have developed a symmetrical Nano antenna by employing Fano resonance, which is independent of the incident wave polarization. The proposed Nano antenna is modified in mid infrared regime for biosensing and energy harvesting applications. The designed metamaterial antenna is made by Nano split ring resonators with etched capacitive gaps, which are utilized for concentrating energy. The introduced Nano antenna has a bright and dark mode with a weak enhancement of electric field. The effect of the incident wave polarization is investigated at wave incident angles between 0° and 45° to illustrate the independency of the polarization due to the symmetrical shape of the Nano antenna. In order to trigger the dark mode and enhance the electric field, a Nano chain is incorporated in the final structure. This arrangement has led to increasing of electric field drastically. Furthermore, the figure of merit has been calculated as an advantageous factor in sensing the surrounding materials with various refractive indices. Our findings illustrated that the chain arrangement has caused a peak in the linear form of the extinction cross section of the Nano antenna. This in turn has resulted in the appearance of Fano resonance with no impact on the resonance frequency that has been originally adjusted by capacitive gaps and inductive strips.
关键词： FANO resonance,Dark mode,Controllable field enhancement,Plasmonic
更新于2025-09-23 15:21:21
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Near Trapped Modes in Long Array of Truncated Circular Cylinders
摘要： The purpose of this article is to investigate near trapped-mode occurrences by arrays of truncated cylinders. The basic question that this article tries to answer is whether near trapped modes (peak loading wave numbers) are indeed stimulated for arrays of truncated cylinders, such as in arrays of bottom-seated cylinders. Arrays of truncated cylinders are conceived as possible wave-energy-extraction mechanisms given that their modules are allowed to oscillate in surge (or sway) and heave, in contrast to bottom-seated cylinders, which are fixed. Hence, an additional question that should be answered is which actual mode of motion is important. To tackle these tasks, the governing hydrodynamic diffraction problem is considered. Different velocity potentials are defined for the liquid regions formed by the geometry of the truncated cylinders. The sought ultimate solution is achieved using the eigenfunction expansion technique combined with the direct approach, which, in contrast to the multiple-scattering method, is unquestionably more efficient and robust.
关键词： Truncated cylinders,Neumann trapped mode,Dirichlet trapped mode,Wave trapping,Near trapped mode
更新于2025-09-23 15:21:01
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In2Se3 nanosheets for harmonic mode-locked fiber laser
摘要： Two-dimensional materials with a sheet structure have excellent optical, electrical and mechanical properties, and have attracted much attention in recent years, especially In2Se3 (the N-type semiconductor compound), which has a rapid development in the fields of materials science and optical communication. In this paper, the nonlinear saturation absorption characteristics of In2Se3 are studied. The In2Se3 nanosheet dispersion can be used in ultrafast photonics applications. The nonlinear absorption is measured by power correlation method, and the modulation depth and saturation intensity are 3.8 % and 246.6 MW/cm2, respectively. More importantly, In2Se3 is used as a saturable absorber (SA) in a passively mode-locked erbium-doped fiber laser. The proposed mode-locked fiber laser is demenstrated with a center wavelength of 1529.4 nm, a fundamental frequency of 5.9 MHz, a spectral width of 3.96 nm, a pulse width of 1.38 ps, and a signal-to-noise ratio of 55 dB. For the first time, harmonic mode-locking with a high-repetition rate of 431 MHz is achieved when the pump power is 360 mW corresponding to 73rd-order harmonic mode locking. It can be seen that In2Se3 is indeed a new excellent photonic material, which can be used in fiber optic communication, SAs photonics,, laser material processing and light modulators.
关键词： harmonic mode-locked,high repetition frequency,mode-locked,In2Se3 SA
更新于2025-09-23 15:21:01