Technologically feasible quasi-edge states and topological Bloch oscillation in the synthetic space

Author:

Wu Xiaoxiong1,Wang Luojia1,Li Guangzhen1ORCID,Cheng Dali12,Yu Danying1ORCID,Zheng Yuanlin1ORCID,Yakovlev Vladislav V.3ORCID,Yuan Luqi1ORCID,Chen Xianfeng1456

Affiliation:

1. Shanghai Jiao Tong University

2. Stanford University

3. Texas A&M University

4. Shanghai Research Center for Quantum Sciences

5. Jinan Institute of Quantum Technology

6. Shandong Normal University

Abstract

The dimensionality of a physical system is one of the major parameters defining its physical properties. The recently introduced concept of synthetic dimension has made it possible to arbitrarily manipulate the system of interest and harness light propagation in different ways. It also facilitates the transformative architecture of system-on-a-chip devices enabling far reaching applications such as optical isolation. In this report, a novel architecture based on dynamically-modulated waveguide arrays with the Su-Schrieffer-Heeger configuration in the spatial dimension is proposed and investigated with an eye on a practical implementation. The propagation of light through the one-dimensional waveguide arrays mimics time evolution of the field in a synthetic two-dimensional lattice. The addition of the effective gauge potential leads to an exotic topologically protected one-way transmission along adjacent boundary. A cosine-shape isolated band, which supports the topological Bloch oscillation in the frequency dimension under the effective constant force, appears and is localized at the spatial boundary being robust against small perturbations. This work paves the way to improved light transmission capabilities under topological protections in both spatial and spectral regimes and provides a novel platform based on a technologically feasible lithium niobate platform for optical computing and communication.

Funder

National Natural Science Foundation of China

National Key Research and Development Program of China

Shanghai Municipal Science and Technology Major Project

Natural Science Foundation of Shanghai

National Science Foundation

Air Force Office of Scientific Research

National Institutes of Health

Cancer Prevention and Research Institute of Texas

Publisher

Optica Publishing Group

Subject

Atomic and Molecular Physics, and Optics

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