Mechanism of optical unidirectional transmission in subwavelength dual-metal gratings

Gao, Hua; Zhang, Zheng; Hao, Huiying; Dong, Aiguo; Fan, Zhenjun; Liu, D. H.

doi:10.1007/s00340-013-5533-z

Cited by 12 publications

(5 citation statements)

References 24 publications

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“…Meanwhile, wide varieties of materials have been employed in the design of optical diodes, such as anisotropic9, left-handed10, nonlinear11 or random amplified materials12. Also, asymmetric transmission can be realized in different engineered material systems such as composite grating structures13141516171819, photonic crystals2021, metal-silicon waveguides22, and even in composition-graded semiconductor nanowires23. Recently, theoretical and experimental studies have proven that chiral metamaterials242526272829, hyperbolic metamaterials30 and all-dielectric digital metasurfaces3132 can enable asymmetric transmission for circularly and linearly polarized light2933.…”

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confidence: 99%

Broadband asymmetric light transmission through tapered metallic gratings at visible frequencies

Tang

Liu

et al. 2016

Sci Rep

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Asymmetric transmission phenomenon has attracted tremendous research interest due to its potential applications in integrated photonic systems. Broadband asymmetric transmission (BAT) is a highly desirable but challenging functionality to achieve in the visible regime due to the limitation of material dispersion. In this paper, we propose and numerically demonstrate that a tapered-metal-grating structure (TMGS) can achieve high-contrast BAT spectra covering the entire visible region. The transmission efficiency reaches ~95% for the forward illumination and ~35% for the backward illumination at the same wavelengths, respectively, and the corresponding transmission ratio is larger than 2.5 over a broadband wavelength regime. Such a design with high performance suggests applications for unidirectional optical transmission, optical diode, and so on.

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confidence: 99%

Broadband asymmetric light transmission through tapered metallic gratings at visible frequencies

Tang

Liu

et al. 2016

Sci Rep

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“…Here we chose CVD synthesized monolayer MoS 2 single crystals as the most important channel materials on account of its outstanding physical properties and scalable production capability. [ 24,25 ] Figure 1c shows the optical microscopy image of monolayer MoS 2 single crystals in regular triangle geometry through CVD method. Most of the as‐synthesized MoS 2 single crystals show large footprint with edge length larger than 100 µm, which allows us to integrate more devices on a single crystal.…”

Section: Resultsmentioning

confidence: 99%

A Monolayer Leaky Integrate‐and‐Fire Neuron for 2D Memristive Neuromorphic Networks

Hao

Zhong

et al. 2020

Adv Elect Materials

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and high density. [4][5][6][7] Moreover, memristors with analog switching behaviors can faithfully resemble biological computational elements in both structure and switching dynamics. With the intrinsic biomimetic features, memristors could act as the basic computational element in artificial neural networks and have been demonstrated with the capability of solving cognitive computing tasks with spatiotemporal complexity without complex peripheral circuits. [7] Among various material systems, 2D materials recently demonstrated memristive switching behaviors that possess biologically comparable energy consumption compared with the traditional memristors based on oxide materials. [8][9][10][11] Thanks to their atomically thin layers and planar configurations, 2D material based memristors have provided an intriguing window into the motions of ions and opportunities to achieve outstanding electrical performances. [12][13][14] It has been reported that vertical synapses built in 2D MoS 2 push the switching threshold voltages to an extremely low value of 0.1 V. [14] More recently, multiterminal memtransistor consisting of hybrid memristor and transistor were fabricated using 2D materials to realize gate-tunable heterosynaptic functionality, which could not be achieved with transitional materials. [4,15,16] In addition, the rapid development of chemical vapor deposition (CVD) technology enables wafer scale production of 2D material, paving the way for large scale integration of 2D devices. Therefore, dimensionality reduction from 3D to 2D provides an innovative way for further advancing memristor devices in both scalability and electrical performance.Despite enormous efforts have been devoted in investigating 2D material based memristors, progresses are only made on emulating various synaptic functions. Neuromorphic networks comprise layers of artificial neurons that receive, process and transmit signals, and synapses that connect the neurons and evolve to alter the connection patterns during learning. [17,18] Although artificial neurons based on traditional oxide and phase change materials have been implemented, 2D materials have their distinct advantages. [19,20] For instance, the physical properties of 2D materials can easily be modulated by multi factors, such as doping and interface engineering, 2D material based memristors have exhibited superior performance as artificial synapses for neuromorphic computing. However, 2D artificial neurons as have note been exploited as an indispensable computational element owing to the rich dynamics of neurons, which impede the construction of a 2D neuromorphic network. A methodology is developed by introducing ionic migration dynamics and electrochemical reaction into monolayer MoS 2 single crystal and a 2D artificial neuron is realized. The sophisticated electrophysiology process of leaky integrate-and-fire (LIF) is emulated by the injection and extraction of Ag + ions under an e-field in a monolayer MoS 2 device with fine-tuned channel length. Moreover, the fire frequency and ...

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“…Usually, the nonreciprocal response requires the time-reversal symmetry breaking of the light-matter interaction [1,2]. The nonreciprocal response can be realized based on different mechanisms or structures including magneto-optic effects [3][4][5], optical nonlinearities [6][7][8][9][10][11], grating structures [12][13][14], optical metamaterials [15][16][17][18], photonic crystals [19][20][21][22], and parity-time symmetric structures [23][24][25]. Among them, the combination of optical nonlinearity and the longitudinal asymmetry is considered in different models including ferroelectrics with cascaded nonlinearity [9], periodic photonic structures with an asymmetrically placed liquid-crystal defect [10], and coherent couplers with a nonlinear phase defect [11].…”

Section: Introductionmentioning

confidence: 99%

Asymmetric propagation of solitons in nonlinear media with gradual nonlocality

Weng¹,

Chen²,

Tang³

et al. 2020

J. Opt.

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We investigate the propagation of solitons in homogeneous nonlocal nonlinear media and in media with gradual nonlinear nonlocality. We calculate the width and the maximum amplitude of solitons during propagation and demonstrate that solitons will propagate asymmetrically in the medium with gradual nonlinear nonlocality. Moreover, the propagation of solitons in the nonlinear medium with gradual nonlocality is independent of the forms of monotonically gradual nonlocalities. Finally, we investigate the ratio of width magnification quantitatively and demonstrate that the soliton with a particular input power maintains its width in one direction and suffers strong expansion in another direction.

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Mechanism of optical unidirectional transmission in subwavelength dual-metal gratings

Cited by 12 publications

References 24 publications

Broadband asymmetric light transmission through tapered metallic gratings at visible frequencies

Broadband asymmetric light transmission through tapered metallic gratings at visible frequencies

A Monolayer Leaky Integrate‐and‐Fire Neuron for 2D Memristive Neuromorphic Networks

Asymmetric propagation of solitons in nonlinear media with gradual nonlocality

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