Topological Properties of Photonic Crystals

Chen, Wenjie; Zhang, Ruo-Yang; Chang, Ming-Li; Xiao, Meng; Chan, Che Ting

doi:10.1142/9789813270329_0005

Cited by 2 publications

(2 citation statements)

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“…The device performance analysis is carried out using the Finite Element Method (FEM) of COMSOL Multiphysics. The topological edge states can only be excited at the interface of two 1D-PhC structures if they possess overlapping bandgaps and distinct Zak phase [13]. The photonic bandgap and Zak phase can be calculated using the reflection spectrum of the device [16].…”

Section: Resultsmentioning

confidence: 99%

“…These TES have been used in various applications because of their robustness against surrounding perturbations. They also offer improvement and manipulation of lightmatter interactions, thus exhibiting propagation of low scattered and topologically protected edge modes having potential applications in polarization filtering or sensing, optical waveguides, and quantum technologies [13][14][15]. However, most of the TES-based devices require a complex and extensive fabrication process, which limits their practical applications.…”

Section: Introductionsmentioning

confidence: 99%

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Design of graded topological resonator for sensitivity improvement

Goyal,

Dash,

Saini

et al. 2023

Optoelectronic Devices and Integration XII

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In this paper, a hyperbolic-graded topological nanophotonic resonator is proposed to excite topologically protected edge states (TES). The index grading is introduced to modify the dispersion characteristics and enhance the mode field confinement of TES. The optimized structure leads to the excitation of a TES at a 1521nm operating wavelength. Further, the structural capability of the refractive index sensor is demonstrated. The analytical results demonstrate a sensitivity of 1806 nm/RIU (with a refractive index range from 1.35 to 1.40). Thus, showing its potential to detect and sense various biochemical analytes accurately.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionsmentioning

confidence: 99%

Design of graded topological resonator for sensitivity improvement

Goyal,

Dash,

Saini

et al. 2023

Optoelectronic Devices and Integration XII

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Performance analysis of heterostructure-based topological nanophotonic sensor

Goyal,

Kumar,

Massoud

2023

Sci Rep

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In this manuscript, a heterostructure-based topological nanophotonic structure is proposed for improved sensing performance. The topological effect is realized by connecting two dissimilar one-dimensional photonic crystal structures having overlapped photonic bandgaps. The structural parameters are optimized to regulate and alter the dispersion characteristics, which results in the opposite Zak phases. This demonstrates a robust topologsical interface state excitation at a 1737 nm operating wavelength. Further, a topological cavity structure having resonance mode at 1659 nm is formed by replacing the interface layers with a defect layer. The mode excitation is confirmed by analyzing the electric field confinement at the interface. The sensing capability of the structure is analytically evaluated by infiltrating different analytes within the cavity. The analytical results demonstrate the device’s average sensitivity of around 774 nm/Refractive index unit (RIU) along with an average high Q-factor and figure of merit of around 5.2 × 104 and 2.6234 × 104 RIU−1, respectively. Because of the higher interface mode field confinement, the proposed structure exhibits a 92% higher sensitivity, 98% improved Quality factor, 206% improvement in figure of merit, and 86% higher interface field confinement than conventional Fabry–Perot resonator structures. Thus, the proposed topological cavity structure shows its broad sensing ability (Refractive Index: 1.3–1.6) along with a low-cost, simple fabrication and characterization process, promoting the development of highly sensitive planner nanophotonic devices.

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Topological Properties of Photonic Crystals

Cited by 2 publications

References 0 publications

Design of graded topological resonator for sensitivity improvement

Design of graded topological resonator for sensitivity improvement

Performance analysis of heterostructure-based topological nanophotonic sensor

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