Unidirectional transmission of visible region topological edge states in hexagonal boron nitride valley photonic crystals

Wu, Min; Yang, Yibiao; Fei, Hongming; Lin, Han; Han, Yuhui; Zhao, Xiaojie; Chen, Zhihui

doi:10.1364/oe.439769

Cited by 14 publications

(7 citation statements)

References 35 publications

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“…[27,28] As a special kind of PCs, valley photonic crystals (VPCs) have many unusual properties which are similar to those of 2D gapped valleytronic materials. [29][30][31][32][33][34] Many interesting phenomena such as topologically protected refraction, [35,36] robust time delay, [37,38] and chirality-locked beam splitting [39,40] have been demonstrated. Currently, most reported VPCs are designed on the honeycomb lattice which consists of two intertwined triangular lattices with the same lattice constant.…”

Section: Introductionmentioning

confidence: 99%

Observation of Unidirectional Bulk Modes and Robust Edge Modes in Triangular Photonic Crystals

Gao

Liao

Shi

et al. 2023

Laser & Photonics Reviews

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The valley contrasting physics in photonic systems gives rise to many interesting phenomena such as photonic valley Hall effect and robust valley transport. However, most reported valley photonic crystals are demonstrated in the honeycomb lattice. Here, unidirectional bulk modes and robust edge modes are numerically and experimentally shown in triangular photonic crystals. By switching the phase vortex of an input chiral source, dynamic unidirectional propagation of bulk modes at different valleys is observed. Unidirectional edge modes are also demonstrated on the domain wall between two distinct triangular photonic crystals. In addition, robust edge modes around sharp corners are experimentally confirmed. This work paves the way for the realization of dynamic unidirectional photonic transport and robust valley transport in photonic crystals.

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Section: Introductionmentioning

confidence: 99%

Observation of Unidirectional Bulk Modes and Robust Edge Modes in Triangular Photonic Crystals

Gao

Liao

Shi

et al. 2023

Laser & Photonics Reviews

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“…Among different TPC designs, valley photonic crystals (VPCs) can be achieved based on dielectric materials without an external magnetic field, thus pushing the working wavelength to the telecommunication and the visible region. [51,52] Here based on the unique spin-valley locking effect of VPCs, we design a high-performance integratable all-optical logic OR gate based on the tunable topological edge states of VPCs. We tune the working bands of the two input channels to minimize their interference, achieving stable and high-fidelity outputs.…”

Section: Introductionmentioning

confidence: 99%

High-performance chiral all-optical OR logic gate based on topological edge states of valley photonic crystal

et al. 2023

Self Cite

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For all-optical communication and information processing, it is necessary to develop all-optical logic gates based on photonic structures that can directly perform logic operations. All-optical logic gates have been demonstrated based on conventional waveguides and interferometry, as well as photonic crystal structures. Nonetheless, any defects in those structures will introduce high scattering loss, which compromises the fidelity and contrast ratio of the information process. Based on the spin-valley locking effect that can achieve defect-immune unidirectional transmission of topological edge states in valley photonic crystals (VPCs), we propose a high-performance all-optical logic OR gate based on a VPC structure. By tuning the working bandwidth of the two input channels, we prevent interference between the two channels to achieve a stable and high-fidelity output. The transmittance of both channels is higher than 0.8, and a high contrast ratio of 28.8 dB is achieved. Moreover, the chirality of the logic gate originated from the spin-valley locking effect allows using different circularly polarized light as inputs, representing "1" or "0", which is highly desired in quantum computing. The device's footprint is 18 × 12 μm2, allowing high-density on-chip integration. In addition, this design can be experimentally fabricated using current nanofabrication techniques and will have potential applications in optical communication, information processing, and quantum computing.

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“…More importantly, this effect can be accomplished by using commonly used semiconductor materials (e.g., silicon) without the requirements of an external magnetic eld. Silicon VPCs working at the telecommunication and visible wavelengths have been demonstrated [45][46][47][48][49][50] , which have great potential in integrated photonics chips [51][52][53][54][55] . In addition, VPCs have been applied to design various devices, such as power splitters 47,56 , photonic routers 46,57 , topological lasers 58,59 , and on-chip modulators 60,61 , focusing on the telecommunication and microwave bands.…”

Section: Introductionmentioning

confidence: 99%

Ultrafast unidirectional on-chip heat transfer

Jia

Yang

Liu

et al. 2023

Preprint

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Effective and rapid heat transfer is critical to improving electronic components' performance and operational stability, particularly for miniaturized devices with high heat dissipation demands. However, current thermal manipulation approaches, including the recent advancement in thermal metamaterials, cannot realize fast and unidirectional control of the heat flow path. In addition, any defects in thermal conductive materials cause a significant decrease in thermal conductivity, severely degrading heat transfer performance. Here, we demonstrate a new approach to achieve ultrafast unidirectional on-chip heat transfer. Using silicon-based valley photonic crystals (VPCs), we have realized robust unidirectional heat transfer through thermal radiation in the infrared wavelength region. This approach can facilitate heat transfer through arbitrarily designed heat flow paths with near-unity heat transmission efficiency independent of temperature. Furthermore, the design exhibits defect immune heat transfer capability due to the unique properties of VPC structures. It opens new possibilities in heat transfer without the inherent limitations of conventional conductive heat transfer mechanism, which inevitably heats up the entire devices, causing severe performance degradation and energy waste. The design is fully CMOS compatible, thus, will find broad applications, particularly in heat dissipation for integrated optoelectronic devices.

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Unidirectional transmission of visible region topological edge states in hexagonal boron nitride valley photonic crystals

Cited by 14 publications

References 35 publications

Observation of Unidirectional Bulk Modes and Robust Edge Modes in Triangular Photonic Crystals

Observation of Unidirectional Bulk Modes and Robust Edge Modes in Triangular Photonic Crystals

High-performance chiral all-optical OR logic gate based on topological edge states of valley photonic crystal

Ultrafast unidirectional on-chip heat transfer

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