Flat band induced topological photonic Tamm states in stubbed structures: Theory and experiment

Khattou, Soufyane; Rezzouk, Yamina; Ghafiani, Mohamed El; Amrani, Madiha; Elaouni, Mohammed; Boudouti, El Houssaine El; Talbi, Abdelkrim; Akjouj, Abdellatif; Djafari‐Rouhani, Bahram

doi:10.1103/physrevb.107.125405

Cited by 5 publications

(2 citation statements)

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“…The physical nature of valley topological edge states is mainly related to the following effects, such as the quantum Hall effect, [18,19] Floquet topological insulators, [20,21] quantum spin Hall effect, [18,21,22] or quantum valley Hall effect. [22,23] An external magnetic field was initially employed to break the time-reversal symmetry, [24,25] and then spatial inversion symmetry breaking was proposed to obtain the effects above.…”

Section: Introductionmentioning

confidence: 99%

Topological resonators based on hexagonal-star valley photonic crystals

Wan 万,

Peng 彭,

Li 李

et al. 2023

Chinese Phys. B

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In valley photonic crystals, topological edge states can be gained by breaking the spatial inversion symmetry without breaking time-reversal symmetry or creating pseudo-spin structures, making highly unidirectional light transmission easy to achieve. This paper presents a novel physical model of a hexagonal-star valley photonic crystal. Simulations based on the finite element method (FEM) are performed to investigate the propagation of TM polarized mode and its application to ring resonators. The results show that such a topologically triangular ring resonator exhibits an optimum quality factor Q of about 1.25 × 104, and Q has a maximum value for both frequency and the cavity length L. Our findings are expected to have significant implications for developing topological lasers and wavelength division multiplexers.

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Section: Introductionmentioning

confidence: 99%

Topological resonators based on hexagonal-star valley photonic crystals

Wan 万,

Peng 彭,

Li 李

et al. 2023

Chinese Phys. B

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“…To perturb the topological edge state, one needs to change the topological invariant by inducing a topological phase transition in either of the PCs [2]. A detailed study of the one-dimensional topological edge state in stubbed photonic crystal structure was recently reported [4]. In 1D PC, the topological phase transition happens by a change in geometry that causes band inversion.…”

Section: Introductionmentioning

confidence: 99%

Topologically originated optical analog of electromagnetically induced reflectance in Dirac semi-metal based photonic structure

C H,

Mathew,

Mathew

2023

J. Phys. D: Appl. Phys.

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The optical analog of the electromagnetically induced reflectance (EIR) effect was theoretically studied in an active topological photonic structure comprising Dirac semi-metal and topological photonic crystal. The destructive interference between the optical Tamm state and topological edge state results in an induced reflection. It was known that the EIR-like effect occurs in a system having a radiative state and a metastable state. Topological protection is used here to achieve a metastable state, so an effective design of the EIR-like effect was possible. The observed EIR-like effect was modeled as a coupled oscillator system. The use of bulk Dirac semi-metal makes this an active photonic system at terahertz frequencies where the Fermi energy can act as a tunable and controlling parameter through which the induced transparency can be varied.

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