Calculation of the Berry curvature and Chern number of topological photonic crystals

Goudarzi, Kiyanoush; Maragheh, Hatef Ghannadi; Lee, Moonjoo

doi:10.1007/s40042-022-00530-x

Cited by 5 publications

(2 citation statements)

References 27 publications

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“…The Chern number can be utilized to predict the existence of TESs and determine their number in a 2D GPC structure. A general way to calculate the gap Chern number (C gap = ∑Cn) is to sum the Chern numbers of all bands below the bandgap; trivial and topologically nontrivial have zero (C gap = 0) and nonzero (C gap = 0) Chern numbers' bandgaps, respectively [52,53].…”

Section: Methodsmentioning

confidence: 99%

A Topological Multichannel Add-Drop Filter Based on Gyromagnetic Photonic Crystals

et al. 2023

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We theoretically proposed a topological multichannel add-drop filter (ADF) and studied its unique transmission properties. The multichannel ADF was composed of two one-way gyromagnetic photonic crystal (GPC) waveguides, a middle ordinary waveguide, and two square resonators sandwiched between them, which can be regarded as two paralleling four-port nonreciprocal filters. The two square resonators were applied with opposite external magnetic fields (EMFs) to support one-way states propagating clockwise and counterclockwise, respectively. On the basis of the fact that the resonant frequencies can be tuned by the EMFs applied to the square resonators, when the intensities of EMFs were the same, the multichannel ADF behaved as a power splitter with a 50/50 division ratio and high transmittance; otherwise, it functioned as a demultiplexer to separate two different frequencies efficiently. Such a multichannel ADF not only possesses excellent filtering performance but also has strong robustness against various defects due to its topological protection property. Moreover, each output port can be switched dynamically, and each transmission channel can operate independently with little crosstalk. Our results have the potential for developing topological photonic devices in wavelength division multiplexing systems.

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Section: Methodsmentioning

confidence: 99%

A Topological Multichannel Add-Drop Filter Based on Gyromagnetic Photonic Crystals

et al. 2023

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“…Due to the periodic nature of PCs, they exhibit PBGs in all directions, acting as ideal mirrors for incident light waves. This property holds potential applications in different fileds suchas lasers [2], filters [3,4], optical waveguides [5][6][7][8][9], optical fibers [10][11][12], all-optical logic gates [12][13][14][15][16], biosensors [17][18][19], splitters [20,21], imaging [22] and all-optical analog to digital converters [23,24]. Also, PCs photonic crystals have found a highly practical application in the field of all-optical logic gates, garnering substantial attention because of their versatility in various all-optical signal processing applications.…”

Section: Introductionmentioning

confidence: 99%

High-Speed Photonic Decoder Employing Two-Dimensional Photonic Crystals

Esmaeili,

Daghighazar,

Chaharmahali

2023

Preprint

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The objective of this study is to design, analyze, and simulate a novel and ultrafast 1 × 2 photonic decoder. The device is composed of two-dimensional (2D) photonic crystals where silicon rods are placed in air. It includes two beam splitters and a phase shifter, which are implemented using point defects. Additionally, line defects are integrated into the device to steer the light wave without causing dissipation. The simulation yielded 0.1 ps response time, contrast ratio of 2.55 dB, and a bit rate of 0.66 Tb/s. The simulation was performed using 2D finite difference time domain and plane wave expansion methods. The findings suggest that this device holds great potential as a candidate for all-optical digital integrated circuits.

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