Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mode-selective Single-dipole Excitation and Controlled Routing of Guided
  Waves in a Multi-mode Topological Waveguide   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.

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The categories of this paper are: plasm-ph
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The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: solv-int
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The categories of this paper are: q-alg
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The categories of this paper are: bayes-an
5
The categories of this paper are: gr-qc
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The categories of this paper are: adap-org
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The categories of this paper are: nucl-th
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The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
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The categories of this paper are: chem-ph
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The categories of this paper are: dg-ga
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The categories of this paper are: mtrl-th
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The categories of this paper are: cs
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The categories of this paper are: q-bio