Coupling of Photon Emitters in Monolayer WS2 with a Photonic Waveguide Based on Bound States in the Continuum

On-chip light sources are an essential component of scalable photonic integrated circuits (PICs), and coupling between light sources and waveguides has attracted a great deal of attention. Photonic waveguides based on bound states in the continuum (BICs) allow optical confinement in a low-refractive...

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Veröffentlicht in:Nano letters 2023-04, Vol.23 (8), p.3209-3216
Hauptverfasser: Liu, Xiao-Jing, Yu, Yue, Liu, Di, Cui, Qi-Long, Qi, Xiaozhuo, Chen, Yang, Qu, Guangyuan, Song, Li, Guo, Guo-Ping, Guo, Guang-Can, Sun, Xiankai, Ren, Xi-Feng
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Sprache:eng
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Zusammenfassung:On-chip light sources are an essential component of scalable photonic integrated circuits (PICs), and coupling between light sources and waveguides has attracted a great deal of attention. Photonic waveguides based on bound states in the continuum (BICs) allow optical confinement in a low-refractive-index waveguide on a high-refractive-index substrate and thus can be employed for constructing PICs. In this work, we experimentally demonstrated that the photoluminescence (PL) from a monolayer of tungsten sulfide (WS2) could be coupled into a BIC waveguide on a lithium-niobate-on-insulator (LNOI) substrate. Using finite-difference time-domain simulations, we numerically obtained a coupling efficiency of ∼2.3% for an in-plane-oriented dipole and a near-zero loss at a wavelength of 620 nm. By breaking through the limits of 2D-material integration with conventional photonic architectures, our work offers a new perspective for light–matter coupling in monolithic PICs.
ISSN:1530-6984
1530-6992
DOI:10.1021/acs.nanolett.2c05034