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

doi:10.1088/1674-1056/accb41

Abstract 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 μm×12 μm, 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.

Keywords: topological photonics topological edge state valley photonic crystal all-optical logic gate

Received: 26 December 2022
Revised: 03 April 2023
Accepted manuscript online: 07 April 2023

PACS:	42.79.Ta	(Optical computers, logic elements, interconnects, switches; neural networks)
	42.25.Bs	(Wave propagation, transmission and absorption)
	42.70.Qs	(Photonic bandgap materials)
	78.67.Pt	(Multilayers; superlattices; photonic structures; metamaterials)

Fund: Project supported by the National Key Research and Development Program of the Ministry of Science and Technology of China (Grant No. 2022YFA1404201), the National Natural Science Foundation of China (Grant No. 11904255), and the Key Research and Development Program of Shanxi Province (International Cooperation) (Grant No. 201903D421052).

Corresponding Authors: Hongming Fei, Han Lin
E-mail: feihongming@tyut.edu.cn;han.lin2@rmit.edu.au

Cite this article:

Xiaorong Wang(王晓蓉), Hongming Fei(费宏明), Han Lin(林瀚), Min Wu(武敏), Lijuan Kang(康丽娟), Mingda Zhang(张明达), Xin Liu(刘欣), Yibiao Yang(杨毅彪), and Liantuan Xiao(肖连团) High-performance chiral all-optical OR logic gate based on topological edge states of valley photonic crystal 2023 Chin. Phys. B 32 074205

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

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