Slow light in topological coupled-corner-state waveguide

Liu, Lei; Wang, Yueke; Li, Mingxing; zheng, Feixiang; Zhou, Haiquan

doi:10.1088/1361-6463/ac7113

Cited by 3 publications

(2 citation statements)

References 41 publications

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“…On the other hand, the increase of n g is inevitably accompanied by an undesirable narrower operational bandwidth for any slow-light waveguide design [12] . Therefore, the normalized delay-bandwidth product (NDBP) is introduced, defined as DBP= n g Δω=ω 0 [13] , where Δω=ω 0 is the normalized bandwidth of a slow-light region and ω 0 is the central frequency of the normalized bandwidth. The NDBP of our design is 0.22 from 637 to 644 nm, calculated from Fig.…”

Section: Conceptual Design Of Hbn Vpcmentioning

confidence: 99%

“…As a result, those designs usually have millimeter sizes and are unsuitable for on-chip integration. In contrast, the slow-light effect of photonic crystals (PCs) can achieve compact ODLs [10][11][12][13][14][15][16][17][18][19][20] for high-density integration by reducing v g , including modified PC waveguides [10] , PC coupled optical waveguides [11] based on PC cavities, and PC microrings [12] . So far, all the ODLs based on PC structures work in the telecommunication wavelength range because a complete photonic bandgap is generally required to achieve high transmission efficiency, requiring high refractive index materials (e.g., silicon).…”

Section: Introductionmentioning

confidence: 99%

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Tunable hexagonal boron nitride topological optical delay line in the visible region

Fei,

Wu,

Lin

et al. 2024

中国光学快报

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Tunability, ultracompact design, high group index, low loss, and broad bandwidth are desired properties for integrated optical delay lines (ODLs). However, those properties are challenging to achieve simultaneously in the visible region. This paper proposes a tunable hexagonal boron nitride topological optical delay line (ODL) in the visible region based on valley photonic crystals. The topological edge state from the beard-type boundary allows the achievement of an ultralow group velocity close to zero, which results in a large group index of 629 at 645 nm. Moreover, we demonstrate tuning of the slow-light wavelength and optical delay times with electrically tunable liquid crystals by applying external voltage. The device has an ultracompact size of 5 μm × 2.7 μm with an optical delay distance of 25a (a is the lattice constant) and a delay time of 12 ps. Our design can provide a new possibility for designing ODLs working in the visible region for optical communication and quantum computing systems.

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Section: Conceptual Design Of Hbn Vpcmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Tunable hexagonal boron nitride topological optical delay line in the visible region

Fei,

Wu,

Lin

et al. 2024

中国光学快报

View full text Add to dashboard Cite

show abstract

Topological rainbow based on coupling of topological waveguide and cavity

Elshahat

Zhang²,

Lu³

2023

Opt. Express

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Topological photonics and topological photonic states have opened up a new frontier for optical manipulation and robust light trapping. The topological rainbow can separate different frequencies of topological states into different positions. This work combines a topological photonic crystal waveguide (topological PCW) with the optical cavity. The dipole and quadrupole topological rainbows are realized through increasing cavity size along the coupling interface. The flatted band can be obtained by increasing cavity length due to interaction strength between the optical field and defected region material which is extensively promoted. The light propagation through the coupling interface is built on the evanescent overlapping mode tails of the localized fields between bordering cavities. Thus, the ultra-low group velocity is realized at a cavity length more than the lattice constant, which is appropriate for realizing an accurate and precise topological rainbow. Hence, this is a novel release for strong localization with robust transmission and owns the possibility to realize high-performance optical storage devices.

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Simultaneous slow light and sound rainbow trapping in phoxonic crystals

DIng¹,

Mao²,

Shen³

et al. 2022

Opt. Lett.

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In this paper, we use a phoxonic crystal (PxC) which can control the topological states of light and sound by breaking inversion symmetry and thus make it possible to achieve rainbow trapping of light and sound simultaneously. It is shown that topologically protected edge states can be obtained at the interfaces between PxCs with different topological phases. Thus, we designed a gradient structure to realize the topological rainbow trapping of light and sound by linearly modulating the structural parameter. In the proposed gradient structure, the edge states of light and sound modes with different frequencies are respectively trapped at different positions, owing to near zero group velocity. The topological rainbows of light and sound are simultaneously realized in one structure, which open a new, to the best of our knowledge, view and provide a feasible platform for the application of the topological optomechanical devices.

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Slow light in topological coupled-corner-state waveguide

Cited by 3 publications

References 41 publications

Tunable hexagonal boron nitride topological optical delay line in the visible region

Tunable hexagonal boron nitride topological optical delay line in the visible region

Topological rainbow based on coupling of topological waveguide and cavity

Simultaneous slow light and sound rainbow trapping in phoxonic crystals

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