Dual-Polarization Second-Order Photonic Topological Insulators

Abstract

Second-order photonic topological insulators that host highly localized corner states resilient to defects, are opening new routes towards developing fascinating photonic devices. However, the existing works on second-order photonic topological insulators have mainly focused on either transverse magnetic or transverse electric modes. In this paper, we propose a dual-polarization topological photonic crystal structure for both transverse magnetic and transverse electric modes through topology optimization. Simple tight-binding lattice models are constructed to reveal the topological features of the optimized photonic crystal structure in a transparent way. The optimized dual-polarization second-order photonic topological insulator hosts four groups of corner states with different profiles and eigenfrequencies for both the transverse magnetic and transverse electric modes. Moreover, the robustness of theses corner states against defects is explicitly demonstrated. Our results offer opportunities for developing polarization-independent topological photonic devices.

arXiv comment9 pages, 9 figures

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Cited by in corpus (8)

• A brief review of topological photonics in one, two, and three dimensions
• Topological metasurface: From passive toward active and beyond
• Higher-order topological states mediated by long-range coupling in $D_4$-symmetric lattices
• Topologically protected second-harmonic generation via doubly resonant high-order photonic modes
• Topological photonic crystal fibers based on second-order corner modes
• Spin-Polarized Fractional Corner Charges and Their Photonic Realization
• Observation of gapless corner modes in synthetic translation dimensions
• Polarization-independent second-order photonic topological corner states