Synthetic Topological Nodal Phase in Bilayer Resonant Gratings

The notion of synthetic dimensions in artificial photonic systems has received considerable attention as it provides novel methods for exploring hypothetical topological phenomena as well as potential device applications. Here, we present nanophotonic manifestation of a two-dimensional topological n...

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Bibliographic Details
Published in:Physical review letters 2022-02, Vol.128 (5), p.053002-053002, Article 053002
Main Authors: Lee, Ki Young, Yoo, Kwang Wook, Cheon, Sangmo, Joo, Won-Jae, Yoon, Jae Woong, Song, Seok Ho
Format: Article
Language:English
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Summary:The notion of synthetic dimensions in artificial photonic systems has received considerable attention as it provides novel methods for exploring hypothetical topological phenomena as well as potential device applications. Here, we present nanophotonic manifestation of a two-dimensional topological nodal phase in bilayer resonant grating structures. Using the mathematical analogy between a topological semimetal and vertically asymmetric photonic lattices, we show that the interlayer shift simulates an extra momentum dimension for creating a two-dimensional topological nodal phase. We present a theoretical model and rigorous numerical analyses showing the two nodal points that produce a complex gapless band structure and localized edge states in the topologically nontrivial region. Therefore, our results provide a practical scheme for producing high-dimensional topological effects in simple low-dimensional photonic structures.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.128.053002