Shaolin Ke

3 weeks ago | opg.optica.org | Xiaohong Li |Yang Liu |Lu Ding |Shaolin Ke

We propose and demonstrate a broadband 3-dB power splitter based on a non-Hermitian triplet waveguide fabricated on a silicon-on-insulator (SOI) platform. By exploiting mirror symmetry, we show that the triplet can be decoupled into two virtual subspaces: a Hermitian subspace featuring a lossless zero mode and a non-Hermitian subspace supporting lossy modes.

Nov 25, 2024 | opg.optica.org | Yang Liu |Fangmei Liu |Shaolin Ke |Fengyi Zhang

We propose a method to convert fundamental modes into orbital angular momentum (OAM) modes through chiral dynamics induced by gauge fluxes in silicon waveguides. By integrating a trench into a few-mode waveguide, we induce the rotation of TE10 and TE01 modes, naturally generating the gauge flux for the synthesized OAM modes.

Dec 25, 2023 | pubs.acs.org | Shuyue Chen |Shaolin Ke |Dong Zhao |Jianghua Ye

Download Hi-Res ImageDownload to MS-PowerPointCite This:Nano Lett. 2024, XXXX, XXX Terms & Conditions Most electronic Supporting Information files are available without a subscription to ACS Web Editions. Such files may be downloaded by article for research use (if there is a public use license linked to the relevant article, that license may permit other uses).

Jul 27, 2023 | opg.optica.org | Shaolin Ke |Tiantian Wang |Qingjie Liu |Dong Zhao

AbstractThe topology of exceptional points (EPs) has been revealed by taking stationary or dynamical encircling around them, which induces eigenstate exchange or chiral mode conversion. However, the conversions are usually reciprocal obeying restricted transmittances. Here we propose the concept of nonreciprocal encircling of EPs in a dynamic waveguide under complex modulation.

May 11, 2023 | link.aps.org | Shaolin Ke |Dong Zhao |Yang Wang

Abstract The non-Hermitian skin effect (NHSE), which involves an extensive number of bulk modes collapsing to open boundaries as skin modes, unveils a variety of unprecedented topological physics. However, achieving this effect in photonic waveguides has been challenging due to the difficulty of establishing the required non-Hermitian asymmetric couplings. Here, we investigate NHSE in photonic waveguide arrays via Floquet engineering.