研究目的
Investigating the realization and properties of novel corner states made out of visible light in three-dimensional photonic structures using femtosecond laser technology.
研究成果
The study successfully demonstrates the realization of kagome-based corner states in an optical waveguide set-up, showcasing a simple and stable implementation that enhances the prospects for photonic technological applications. The observed 'fractionalization' of light in triangular geometries is a novel feature, highlighting the flexibility and control achievable in this platform.
研究不足
The protection of higher-order topological phases depends on crystalline symmetries, making them less robust than ordinary topological states. The experimental realization is limited to specific geometries and requires precise control over waveguide spacing and light wavelength.
1：Experimental Design and Method Selection:
The study involves the creation of waveguide arrays forming two-dimensional breathing kagome lattices in various sample geometries using femtosecond laser technology. The propagation of light is governed by the paraxial equation, accurately modelled by a tight-binding Hamiltonian.
2：Sample Selection and Data Sources:
Waveguide arrays are inscribed in glass samples with specific lattice spacings (d1 = 12 μm and d2 = 7 μm) to form rhombic and triangular geometries.
3：List of Experimental Equipment and Materials:
A pulsed femtosecond laser (BlueCut from Menlo Systems) is used to inscribe waveguides in Corning EAGLE2000 alumino-borosilicate glass samples. A tunable laser (Cameleon Ultra II, Coherent) is used for light injection, and a CCD camera captures the output light.
4：Experimental Procedures and Operational Workflow:
Light is injected into the waveguide at specific corners, and the output is observed at different wavelengths to study localization and fractionalization of light.
5：Data Analysis Methods:
The observed light patterns are compared with theoretical predictions from the tight-binding model to confirm the presence of corner states.
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