Slow-light dispersion properties of multiatomic multiband coupled-resonator optical waveguides

Yu, Sunkyu; Piao, Xianji; Park, Namkyoo

doi:10.1103/physreva.85.023823

Cited by 16 publications

(7 citation statements)

References 25 publications

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“…Besides considering the nearest coupling between TCSs along x-direction, there is coupling between TCSs along y-direction. Thus, two CCSW waveguide modes appear based on multiatomic multiband CROW [41] distributions of the two modes with K x = 0.4(2π/R). The mode with symmetrical (anti-symmetrical) E z distribution about x-axis is SCCSW (ASCCSW) mode.…”

Section: Multimode In Ccswmentioning

confidence: 99%

Slow light in topological coupled-corner-state waveguide

Liu¹,

Wang²,

Li³

et al. 2022

J. Phys. D: Appl. Phys.

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We theoretically propose a Coupled-Corner-State Waveguide (CCSW), which is composed of a zigzag edge-like structure based on C-4 symmetrical lattice. CCSW mode is achieved by weak coupling between a sequence of higher order topological corner state (TCS). Based on the tight-binding (TB) approximation, the flat dispersion relation of CCSW mode is obtained, and suitable for slowing down light. The characteristics of slow light, including the group index and group velocity dispersion, are discussed in detail. At the eigenfrequency of individual TCS, the group velocity dispersion of CCSW mode is zero. Importantly, the CCSW mode shows strong robustness when introducing disorders, compared with the conventional Coupled-Resonator-Optical Waveguide (CCROW) based on photonic crystal defect cavities. Our findings may find topological slow light applications such as optical buffers, the processing of optical signals, optical delay lines and so on.

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Section: Multimode In Ccswmentioning

confidence: 99%

Slow light in topological coupled-corner-state waveguide

Liu¹,

Wang²,

Li³

et al. 2022

J. Phys. D: Appl. Phys.

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“…genetic algorithm. We also note that the impact of higher-order coupling is critical for the analysis of densely-packed and large-scale devices [19,33], and the engineering of spectral singularity [14] and slow light dispersion [34]. Our deterministic 1D realization thus provides simple and controllable achievements of higher-order coupling effects.…”

Section: M2m1)·h·(mqmq-1 … M2m1)mentioning

confidence: 99%

Interdimensional optical isospectrality inspired by graph networks

Yu¹,

Piao²,

Hong³

et al. 2016

Optica

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A network picture has been applied to various physical and biological systems to understand their governing mechanisms intuitively. Utilizing discretization schemes, both electrical and optical materials can also be interpreted as abstract 'graph' networks composed of couplings (edges) between local elements (vertices), which define the correlation between material structures and wave flows. Nonetheless, the fertile structural degrees of freedom in graph theory have not been fully exploited in physics owing to the suppressed long-range interaction between far-off elements. Here, by exploiting the mathematical similarity between Hamiltonians in different dimensions, we propose the design of reduceddimensional optical structures that perfectly preserve the level statistics of disordered graph networks with significant long-range coupling. We show that the disorder-induced removal of the level degeneracy in high-degree networks allows their isospectral projection to one-dimensional structures without any disconnection. This inter-dimensional isospectrality between high-and low-degree graph-like structures enables the ultimate simplification of broadband multilevel devices, from three-to one-dimensional structures.Random scattering provides the spread of momentum and energy components of waves [1][2][3], differentiating disordered materials from periodic or quasiperiodic materials [4,5]. Due to the critical needs in light harvesting [6], robust bandgaps [7,8], and ultrafast optics [9], disordered optical materials have also been intensively studied to exploit their broadband responses. Although one-(1D) [8,10], two-(2D) [1,11,12], and three-dimensional (3D) [13] disordered structures have been considered promising candidates for broadband and omnidirectional operations, the deliberate control of disordered structures [1,3,7,8,14] has been achieved only in 1D or 2D structures, owing to the difficulty of manipulating 3D randomness.To understand the role of the 'dimension' in optics, we can employ the interdisciplinary viewpoint from network theory. For the structures composed of coupled resonances, light flows inside those can be interpreted as signal transport over graph networks [14][15][16][17]. Reciprocity constructs the undirected network [14,18], whose vertices and edges denote resonances and coupling, respectively. The strength of disorder then corresponds to the graph irregularity, and the dimension of material structures determines the 'degree' of graphs, which quantifies the number of coupling paths in space. This graphbased perspective reveals that optical structures in 3D real space cover only restricted parts of general graph theory [18], originating from the difficulty in connecting far-off vertices in real space. At most, nearestneighbor and next-nearest-neighbor coupling [19] have been considered in the light transport.Here, we focus on the real-space reproduction of the level statistics in hypothetical optical networks of arbitrary couplings, consequently deriving the 'isospectrality' between the stru...

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“…In recent years, surface plasmon polaritons (SPPs)-based all-optical devices have been of interest of researchers [1][2][3][4][5][6][7][8]. All-optical SPP devices overcome the diffraction limit in photonic devices and limitations of semiconductor-based electrical devices such as intrinsic delay and significant thermal production.…”

Section: Introductionmentioning

confidence: 99%

“…Therefore, in SPP devices, the light can be controlled in a scale smaller than the operational wavelength (subwavelength scale) [3]. Constructive or destructive interference between two or more light signals within two or more waveguides is the principle for controlling the operation of these circuits [5][6][7]. Constructive and destructive interferences are used for switching operations in SPP devices [8].…”

Section: Introductionmentioning

confidence: 99%

High Transmission All-Optical Combinational Logic Circuits Based on a Nanoring Multi-Structure at 1.31 µm

Sadeq,

Hayati,

Khosravi

2023

Micromachines

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The main purpose of this study is to design combinational logic gates based on a novel configuration of insulator–metal–insulator (IMI) nanoring plasmonic waveguides. Plasmonic logic gates are half adder, full adder, half subtractor, full subtractor, and one-bit comparator and are realized in one structure. The performance of the logic circuits is based on constructive and destructive interferences between the input and control signals. The transmission threshold value is assumed to be 0.35 at the resonance wavelength of 1.310 μm. The transmission spectrum, contrast loss (CL), insertion loss (IL), modulation depth (MD), and contrast ratio (CR) are calculated in order to evaluate the structure’s performance. The maximum transmission of the proposed structure is 232% for full a adder logic gate, and MD exceeds 90% in all plasmonic combinational logic circuits. The suggested design plays a key role in the photonic circuits and nanocircuits for all-optical systems and optical communication systems. The combinational logic gates are analyzed and simulated using the finite element method (FEM).

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Slow-light dispersion properties of multiatomic multiband coupled-resonator optical waveguides

Cited by 16 publications

References 25 publications

Slow light in topological coupled-corner-state waveguide

Slow light in topological coupled-corner-state waveguide

Interdimensional optical isospectrality inspired by graph networks

High Transmission All-Optical Combinational Logic Circuits Based on a Nanoring Multi-Structure at 1.31 µm

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