Ultra-subwavelength focusing and giant magnetic-field enhancement in a low-loss one-way waveguide based on remanence

Xu, Jie; Deng, Xiaohua; Zhang, Hang; Wu, Chiaho; Wubs, Martijn; Xiao, Sanshui; Shen, Linfang

doi:10.1088/2040-8986/ab68ef

Cited by 9 publications

(4 citation statements)

References 36 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…2 . [46,47] ω 0 = 2πγB 0 is the precession angular frequency, and ω r = 2π × 3.587 × 10 9 rad s −1 is the characteristic circular frequency. [48] B 0 , ω, and ω m are the magnetic bias field, the angular frequency and the characteristic circular frequency, respectively.…”

Section: The Y-shaped Module Of the Aodlsmentioning

confidence: 99%

All‐Optical Digital Logic Based on Unidirectional Modes

Luo

Xiao

et al. 2022

Advanced Optical Materials

Self Cite

View full text Add to dashboard Cite

Standard electronic computing based on nanoelectronics and logic gates has upended our lives in a profound way. However, suffering from, both, Moore's law and Joule's law, further development of logic devices based solely on electricity has gradually stuck in the mire. All‐optical logic devices are believed to be a potential solution for such a problem. This work proposes an all‐optical digital logical system (AODLS) based on unidirectional (one‐way propagation) modes in the microwave regime. In a Y‐shaped module of the AODLS, the basic seven logic gates, including OR, AND, NOT, NOR, NAND, XOR, and XNOR gates, are achieved for continuous broadband operation relying on the existence of unidirectional electromagnetic signals. Extremely large extinction and contrast ratios are found in these logic gates. The idea of “negative logic” is used in designing the AODLS. Moreover, the authors further demonstrate that the AODLS can be assembled to multi‐input and/or multi‐output logical functionalities, which is promising for parallel computation. Besides, numerical simulations perfectly fit with and corroborate the theoretical analyses presented here. The low‐loss, broadband, and robust characteristics of this system are outlined and studied in some detail. The AODLS consisting of unidirectional structures may open a new route for all‐optical calculation and integrated optical circuits.

show abstract

Section: The Y-shaped Module Of the Aodlsmentioning

confidence: 99%

All‐Optical Digital Logic Based on Unidirectional Modes

Luo

Xiao

et al. 2022

Advanced Optical Materials

Self Cite

View full text Add to dashboard Cite

show abstract

“…In our previous works [6,7,9,41], cutting off the magnetic-optical (MO) material has been proved to be an efficient way to engineer the dispersion of the EM modes (e.g., SMPs) in the nonreciprocal systems. In this paper, we will show how such technique can be used to achieve broadband index-near-zero modes.…”

Section: Slowed Down Unidirectional Smpsmentioning

confidence: 99%

Realization of broadband index-near-zero modes in nonreciprocal magneto-optical heterostructures

Zhou,

He,

Xiao

et al. 2022

Preprint

Self Cite

View full text Add to dashboard Cite

Epsilon-near-zero (ENZ) metamaterial with the relative permittivity approaching zero has been a hot research subject in the past decades. The wave in the ENZ region has infinite phase velocity (v = 1/ √ εµ), whereas it cannot efficiently travel into the other devices or air due to the impedance mismatch or near-zero group velocity. In this paper, we demonstrate that the tunable index-nearzero (INZ) modes with vanishing wavenumbers (k = 0) and nonzero group velocities (v g = 0) can be achieved in nonreciprocal magneto-optical systems. This kind of INZ modes has been experimentally demonstrated in the photonic crystals at Dirac point frequencies and that impedance-matching effect has been observed as well. Our theoretical analysis reveals that the INZ modes exhibit tunability when changing the parameter of the one-way (nonreciprocal) waveguides. Moreover, owing to the zero-phase-shift characteristic and decreasing v g of the INZ modes, several perfect optical buffers (POBs) are proposed in the microwave and terahertz regimes. The theoretical results are further verified by the numerical simulations performed by the finite element method. Our findings may open the new avenues for research in the areas of ultra -strong or -fast nonlinearity, perfect cloaking, high-resolution holographic imaging and wireless communications.

show abstract

“…YIG-based one-way waveguides, as reported in many works, sustain the transverse electric (TE) modes rather transverse magnetic (TM) modes, making it possible to cover the structure in the direction of H 0 with no influence to the one-way propagation character of the SMPs [24]. Considering the realistic 3-dimensional (3D) condition, in this subsection, we design the 3D MDYM channel based on remanence.…”

Section: A 3d Electromagnetic Compressor Based On Remanencementioning

confidence: 99%

Broadband energy squeezing and tunneling based on unidirectional modes

Hong¹,

Wang

Shen³

et al. 2021

Preprint

Self Cite

View full text Add to dashboard Cite

Energy squeezing attracts many attentions for its potential applications in electromagnetic (EM) energy harvesting and optical communication. However, due to the Fabry-Perot resonance, only the EM waves with discrete frequencies can be squeezed and, as far as we know, in the previous energysqueezing devices, stringent requirements of the materials or the geometrical shape are needed. We note that the structures filled with epsilon-near-zero (ENZ) mediums as reported in some works can squeeze and tunnel EM waves at frequencies (e.g. plasma frequency). However, the group velocity is usually near zero which means few EM information travel through the structures. In this paper, low-loss energy squeezing and tunneling (EST) based on unidirectional modes were demonstrated in YIG-based one-way waveguides at microwave frequencies. According to our theoretical analysis and the simulations using finite element method, broadband EST was achieved and the EM EST was observed even for extremely bended structures. Besides, similar EM EST was achieved in a realistic three-dimensional remanence-based one-way waveguide as well. The unidirectional modesbased EST paving the way to ultra-subwavelength EM focusing, enhanced nonlinear optics, and designing numerous functional devices in integrated optical circuits such as phase modulator.

show abstract

Ultra-subwavelength focusing and giant magnetic-field enhancement in a low-loss one-way waveguide based on remanence

Cited by 9 publications

References 36 publications

All‐Optical Digital Logic Based on Unidirectional Modes

All‐Optical Digital Logic Based on Unidirectional Modes

Realization of broadband index-near-zero modes in nonreciprocal magneto-optical heterostructures

Broadband energy squeezing and tunneling based on unidirectional modes

Contact Info

Product

Resources

About