首页|Mode-selective single-dipole excitation and controlled routing of guided waves in a multi-mode topological waveguide

Mode-selective single-dipole excitation and controlled routing of guided waves in a multi-mode topological waveguide

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Topology-linked binary degrees of freedom of guided waves have been used to expand the channel capacity of and to ensure robust transmission through photonic waveguides. However, selectively exciting optical modes associated with the desired degree of freedom is challenging and typically requires spatially extended sources or filters. Both approaches are incompatible with the ultimate objective of developing compact mode-selective sources powered by single emitters. In addition, the implementation of highly desirable functionalities, such as controllable distribution of guided modes between multiple detectors, becomes challenging in highly compact devices due to photon loss to reflections. Here, we demonstrate that a linearly polarized dipole-like source can selectively excite a topologically robust edge mode with the desired valley degree of freedom. Reflection-free routing of valley-polarized edge modes into two spatially separated detectors with reconfigurable splitting ratios is also presented. An optical implementation of such a source will have the potential to broaden the applications of topological photonic devices.

Yandong Li、Yang Yu、Kueifu Lai、Yuchen Han、Fei Gao、Baile Zhang、Cennady Shvets

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School of Applied and Engineering Physics, Cornell University, Ithaca, New York 14853, USA

Department of Physics, The University of Texas at Austin, Austin, Texas 78712, USA

Department of Physics, Cornell University, Ithaca, New York 14853, USA

Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University,21 Nanyang Link, Singapore 637371, Singapore, Interdisciplinary Center for Quantum Information, State Key Laboratory of Modern Optical Instrumentation, ZJU-Hangzhou Global Science and Technology Innovation Center, College of Information Science and Electronic Engineering, Zhejiang University,Hangzhou 310027, China

Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University,21 Nanyang Link, Singapore 637371, Singapore, Centre for Disruptive Photonic Technologies, The Photonics Institute, Nanyang Technological University, 50 Nanyang Avenue,Singapore 639798, Singapore

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2022

10.1063/5.0083989

Applied physics letters

Applied physics letters

EISCI
ISSN：0003-6951
年,卷(期)：2022.120(22)
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