Robust Optical Mode Conversion in Waveguides by Triplet Supercell

Song, Wange; Wu, Shengde; Chen, Yuxin; Chen, Chen; Gao, Shenglun; Huang, Chunyu; Qiu, Kai; Zhu, Shining; Li, Tao

doi:10.1103/physrevapplied.17.014039

Cited by 4 publications

(3 citation statements)

References 26 publications

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“…The Thouless pumping mechanism is utilized in the device design to give rise to the broadband and fabrication tolerant properties. Different from the previous works based on Zak‐phase‐induced topological edge states, [ 29,42 ] gauge‐induced topological edge states, [ 30 ] or breathing modes, [ 43 ] the topological pumping protocol used in this work shows robustness against not only the variations in wavelength and gap distance but also the errors in waveguide width. The topological DC has a measured IL of <0.5 dB and measured CT of <−20 dB over a 120 nm wavelength range from 1480 to 1600 nm.…”

Section: Discussionmentioning

confidence: 87%

Broadband and Fabrication Tolerant Power Coupling and Mode‐Order Conversion Using Thouless Pumping Mechanism

Sun

Wang

et al. 2022

Laser & Photonics Reviews

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Coupled‐waveguide devices are of central importance in on‐chip photonic circuits. However, their performance usually suffers from high wavelength and structure sensitivity, which makes it challenging to achieve broadband and fabrication tolerant optical functions. Topological pumping of edge states has emerged as a promising route for robust light transport in coupled waveguides. Here, the Thouless pumping process is explored in finite Rice‐Mele modeled silicon waveguide arrays and the robust power coupling and mode‐order conversion are experimentally demonstrated in this system. Thanks to the topological protection of light transport, the directional coupler and mode‐order converter based on the waveguide arrays show an ultrabroad bandwidth of 120 nm and are quite tolerant to significant structural deviations (−50–150 nm). As compared to the robust optical coupling in other topological waveguide arrays reported in recent works, the approach is more advantageous in terms of robustness against the variations in both waveguide width and gap distance, which is greatly favored in large‐scale photonic integration. This work could serve as a design principle for a new class of broadband and fabrication tolerant coupled‐waveguide devices, which can find applications in many fields including optical simulations of condensed matter physics, on‐chip optical communications, and quantum information processing.

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Section: Discussionmentioning

confidence: 87%

Broadband and Fabrication Tolerant Power Coupling and Mode‐Order Conversion Using Thouless Pumping Mechanism

Sun

Wang

et al. 2022

Laser & Photonics Reviews

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“…In contrast, the zero mode is always pinned at zero energy regardless of the c 1 and c 2 (see the red flat plane in Figure 1c), indicating the robustness of this mode, which is protected by the chiral symmetry. [6,36,37] More importantly, attributed to the antisymmetric mode profile on side waveguides and no energy on the central one (see mode-e in Figure 1e; and Equations S1-S3 in the Supporting Information), the zero mode is lossless regardless of the loss 𝛾 implemented on the central waveguide (see Figure 1d, red plane).…”

Section: Asymmetric Light Transfer With Non-hermitian Lnoi Waveguide ...mentioning

confidence: 99%

Broadband Asymmetric Light Transport in Compact Lithium Niobate Waveguides

Song

Sun

et al. 2023

Laser & Photonics Reviews

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Asymmetric on‐chip light transport is important but always challenging for photonic integrations. Although it has been recently implemented by adiabatically encircling the exceptional points in a non‐Hermitian system, these approaches are fundamentally restricted to the adiabatic condition that brings disadvantages of low transmission efficiency and large device footprint. Here, it is proposed to realize a broadband asymmetric light transport in compact non‐Hermitian coupled waveguides on the lithium niobate‐on‐insulator (LNOI) platform. The asymmetric function is fulfilled by a particular mode selection in a loss‐controlled LNOI waveguide triplet, where a lossless zero mode plays a crucial role. Moreover, the shortcut to adiabaticity is applied to speed up the light evolution and shorten the device length. The approach works out a new strategy to establish an asymmetric light transport in a compact form, indicating further new on‐chip light manipulations in this promising LNOI photonic platform.

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“…[130] Besides static waveguides, topological coupled-waveguide devices induced by artificial gauge field (AGF) and Thouless pumping mechanism exhibit more advantages, in terms of robustness against the variations in wavelength, waveguide spacing, and waveguide width (Figure 6c). [131][132][133] These predominant properties arise from the topological protection of the Chern number and the flat dispersion. In particular, the driven topological waveguide arrays can be extended to build the mode converters (MCs).…”

Section: Topological Waveguide Arrays Toward Applicationsmentioning

confidence: 99%

Topological Photonic States in Waveguide Arrays

Kang

Wei

Zhang

et al. 2022

Advanced Physics Research

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Topological photonics, accompanied by the ability to manipulate light, has emerged as a rapidly growing field of research. More platforms for displaying novel topological photonic states are being explored, thus offering efficient strategies for the realization of robust photonic devices. Optical waveguide arrays, described as a (n+1)‐dimensional system, are ideal platforms for studying topological photonics because of the characteristic that can exhibit light dynamics. Here, this work reviews the experimental implementations of the various topological phases in the optical waveguide arrays, and specifically discusses novel physical phenomena arising from the combination of topology with non‐Hermitianity and nonlinearity. It is believed that topological waveguide arrays provide powerful support for enriching topological physics and promoting the development of topological photonic integrated devices.

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Robust Optical Mode Conversion in Waveguides by Triplet Supercell

Cited by 4 publications

References 26 publications

Broadband and Fabrication Tolerant Power Coupling and Mode‐Order Conversion Using Thouless Pumping Mechanism

Broadband and Fabrication Tolerant Power Coupling and Mode‐Order Conversion Using Thouless Pumping Mechanism

Broadband Asymmetric Light Transport in Compact Lithium Niobate Waveguides

Topological Photonic States in Waveguide Arrays

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