One-Way Electromagnetic Mode Guided by the Mechanism of Total Internal Reflection

Shen, Linfang; Xu, Jie; You, Yun; Yuan, Kai; Deng, Xiaohua

doi:10.1109/lpt.2017.2776106

Cited by 14 publications

(12 citation statements)

References 14 publications

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“…Therefore, one-way SMPs is realizable at terahertz frequencies by using semiconductors [14]. In a semiconductor-dielectric-metal (SDM) layered structure, it was shown that one-way SMPs can be immune to backscattering, thus exhibiting the complete one-way propagation (COWP) [15,19].…”

Section: Introductionmentioning

confidence: 99%

Broadband one-way propagation and rainbow trapping of terahertz radiations

Xu¹,

Xiao²,

Wu³

et al. 2019

Opt. Express

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Surface magnetoplasmon (SMP) supported at an interface between magnetized plasmonic and dielectric materials has been widely explored; however, it suffers with narrow bandwidth for one-way propagation. Here we propose a novel metal-semiconductor-dielectricmetal (MSDM) structure showing the large bandwidth for the complete one-way propagation (COWP). Because of the compression of the zone for two-way propagating modes in the semiconductor layer by reducing semiconductor thickness, the bandwidth is significantly increased by several times. More importantly, in such MSDM structure, the SMP dispersion can be engineered by controlling the semiconductor thickness, and based on this, slowing wave and trapping rainbow can be realized in a tapered system at terahertz frequencies.

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Section: Introductionmentioning

confidence: 99%

Broadband one-way propagation and rainbow trapping of terahertz radiations

Xu¹,

Xiao²,

Wu³

et al. 2019

Opt. Express

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“…An external magnetic field (B 0 ) is applied on the InSb layer to break the time-reversal symmetry in the system. In our previous works, we have proved that the loss effect has almost no impact on the one-way property in such MO system [32,51]. Thus, we study the dispersion relation of SMPs in lossless condition in this work.…”

Section: Introductionmentioning

confidence: 93%

“…Thus, we study the dispersion relation of SMPs in lossless condition in this work. The permittivity of InSb, as reported in many works [17,28,51], can be written as follow…”

Section: Introductionmentioning

confidence: 99%

Realization of broadband truly rainbow trapping in gradient-index heterostructures

Xu,

Xiao,

et al. 2021

Preprint

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Unidirectionally propagating waves (UPW) such as topologically protected edge modes and surface magnetoplasmons (SMPs) has been a research hotspot in the last decades. In the study of UPW, metals are usually treated as perfect electric conductors (PECs) which, in general, are the boundary conditions. However, it was reported that the transverse resonance condition induced by the PEC wall(s) may significantly narrow up the complete one-way propagation (COWP) band. In this paper, we propose two ways to achieve ultra-broadband one-way waveguide in terahertz regime. The first way is utilizing the epsilon negative (ENG) metamaterial (MM) and the other one is replacing the PEC boundary with perfect magnetic conductor (PMC) boundary. In both conditions, the total bandwidth of the COWP bands can be efficiently broadened by more than three times. Moreover, based on the ultra-broadband one-way configurations, gradient-index metamaterial-based one-way waveguides are proposed to achieve broadband truly rainbow trapping (TRT). By utilizing the finite element method, the realization of the broadband TRT without backward reflection is verified in gradient-index structures. Besides, giant electric field enhancement is observed in a PMC-based one-way structure with an ultra-subwavelength (≈ 10 −4 λ 0 , λ 0 is the wavelength in vaccum) terminal, and the amplitude of the electric field is enormously enhanced by five orders of magnitude. Our findings are beneficial for researches on broadband terahertz communication, energy harvesting and strong-field devices.

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“…The incident wave that satisfies the condition of total internal reflection [30] will be the evanescent mode, in general, which will return to the incident medium after penetrating the optically thinner medium layer with a certain depth instead of spreading. However, the evanescent wave can propagate if we adjust the thicknesses of optically thinner medium layers appropriately to couple its output.…”

Section: A Influence Of the Number Of Periodsmentioning

confidence: 99%

A Novel Comb-Like Nonreciprocal Evanescent Wave Filter Based on the 1-D Ternary Magnetized Plasma Photonic Crystals

Xiang

Peng

Wan

et al. 2021

IEEE Trans. Plasma Sci.

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In this article, the magnetized plasma in 1-D ternary periodic photonic crystals is utilized as a kind of single negative material whose real part of permittivity is negative. Some discrete resonant peaks with high transmittance can be observed in the transmission band due to the evanescent wave coupling between plasma layers and dielectric layers. The nonreciprocal effect can be achieved by injecting counter-propagating TM waves into the proposed structure whose time-reversal symmetry and space-reversal symmetry are broken. The transmission band of nonreciprocal evanescent waves can be modulated dynamically due to the tuning of the period number, the plasma frequency, the plasma cyclotron frequency, the filling factor of plasma, and the incident angle. The simulation results indicate that the proposed structure can achieve 100% transmission and strong nonreciprocity, which can supply multichannel unidirectional filters with theoretical references. Index Terms-1-D ternary photonic crystals (PCs), evanescent wave, magnetized plasma, nonreciprocal properties, transfer matrix method (TMM).

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One-Way Electromagnetic Mode Guided by the Mechanism of Total Internal Reflection

Cited by 14 publications

References 14 publications

Broadband one-way propagation and rainbow trapping of terahertz radiations

Broadband one-way propagation and rainbow trapping of terahertz radiations

Realization of broadband truly rainbow trapping in gradient-index heterostructures

A Novel Comb-Like Nonreciprocal Evanescent Wave Filter Based on the 1-D Ternary Magnetized Plasma Photonic Crystals

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