Topological Photonic Crystals

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (2 January 2025) | Viewed by 1848

Special Issue Editors


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Guest Editor
Department of Theoretical and Experimental Physics, Universidade Federal do Rio Grande do Norte, Natal, Brazil
Interests: topological photonic crystals; condensed matter physics

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Guest Editor
LAREB, Universidade Federal do Ceará, Russas 62900-000, CE, Brazil
Interests: topological photonic crystals; photonics; magnonics; phononics; quasicrystals

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Guest Editor
Department of Theoretical and Experimental Physics, Universidade Federal do Rio Grande do Norte, Natal, Brazil
Interests: lévy flights; random walks; statistical mechanics
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Special Issue Information

Dear Colleagues,

Topological photonic crystals have become one of the main structures for manipulating light, making the study of these structures one of the most attractive topics in physics and engineering in recent years. Topological photonic crystals are currently in the scientific limelight not only because they possess tremendous technological potential but also because they have opened several avenues of basic science research. This is a result of their incredible capacity to simulate electronic phenomena, such as the quantum Hall effect, the quantum valley Hall effect, the quantum spin Hall effect, and topological insulators, among others. From a technological perspective, topological photonic crystals are excellent candidates for potential applications in topological lasers, topological waveguides, filters, and resonators.

This Special Issue will focus on some of the most recent advances in the field of "Topological Photonic Crystals". The Special Issue’s topics will likely include the following (though the following list is not exhaustive): recent advances in the design of new topological photonic structures; the simulation of electronic phenomena; studies of intrinsic and extrinsic disorder effects; and technological applications such as waveguides, lasers, filters, and resonators.

Prof. Dr. Claudionor Gomes Bezerra
Prof. Dr. Carlos Humberto Oliveira Costa
Prof. Dr. Gandhimohan M. Viswanathan
Guest Editors

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Keywords

  • topological photonic crystals
  • topological phases
  • edge states
  • localization of light
  • waveguides
  • lasers
  • filters
  • resonators

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Published Papers (2 papers)

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Research

10 pages, 4190 KiB  
Article
Topological Cavity Chains via Shifted Photonic Crystal Interfaces
by Wei Li, Junhui Hu and Hai-Xiao Wang
Crystals 2025, 15(1), 60; https://doi.org/10.3390/cryst15010060 - 9 Jan 2025
Viewed by 367
Abstract
Recent advances in topological photonics provide unprecedented opportunities to realize a photonic cavity. A recent work shows that the electromagnetic wave can be effectively trapped via the shifted photonic crystal interfaces (SPCIs), which offers an alternative approach to realizing the photonic cavity. Here, [...] Read more.
Recent advances in topological photonics provide unprecedented opportunities to realize a photonic cavity. A recent work shows that the electromagnetic wave can be effectively trapped via the shifted photonic crystal interfaces (SPCIs), which offers an alternative approach to realizing the photonic cavity. Here, we proposed one-dimensional topological insulators based on an SPCIs-induced cavity chain, which is analogous to the Su–Schrieffer–Hegger model and is compatible with the silicon-on-insulator platform. Owing to the asymmetry feature of SPCIs-induced cavities, the topological cavity chains can be either realized by alternating the cavity modes or by tuning the distance between two cavities. The nontrivial band topology of SPCIs-induced cavity chains is further confirmed by observing topological end states, which exhibit robustness against geometrical imperfections. Our work holds promises for designing robust photonic devices, which may find potential applications in future integrated photonics. Full article
(This article belongs to the Special Issue Topological Photonic Crystals)
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13 pages, 2915 KiB  
Article
The Nested Topological Band-Gap Structure for the Periodic Domain Walls in a Photonic Super-Lattice
by Zhen Lai, Yufu Liu, Yunlin Li, Xuezhi Wang and Xunya Jiang
Crystals 2024, 14(9), 757; https://doi.org/10.3390/cryst14090757 - 26 Aug 2024
Viewed by 730
Abstract
We study the nested topological band-gap structure of one-dimensional (1D) photonic super-lattices. One cell of the super-lattice is composed of two kinds of photonic crystals (PhCs) with different topologies so that there is a domain wall (DW) state at the interface between the [...] Read more.
We study the nested topological band-gap structure of one-dimensional (1D) photonic super-lattices. One cell of the super-lattice is composed of two kinds of photonic crystals (PhCs) with different topologies so that there is a domain wall (DW) state at the interface between the two PhCs. We find that the coupling of periodic DWs could form a new band-gap structure inside the original gap. The new band-gap structure could be topologically nontrivial, and a topological phase transition can occur if the structural or material parameters of the PhCs are tuned. Theoretically, we prove that the Hamiltonian of such coupled DWs can be reduced to the simple Su–Schrieffer–Heeger (SSH) model. Then, if two super-lattices carrying different topological phases are attached, a new topological interface state can occur at the interface between the two super-lattices. Finally, we find the nested topological band-gap structure in two-dimensional (2D) photonic super-lattices. Consequently, such nested topological structures can widely exist in complex super-lattices. Our work improves the topological study of photonic super-lattices and provides a new way to realize topological interface states and topological phase transitions in 1D and 2D photonic super-lattices. Topological interface states in super-lattices are sensitive to frequency and have high accuracy, which is desired for high-performance filters and high-finesse cavities. Full article
(This article belongs to the Special Issue Topological Photonic Crystals)
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