Spatial dispersion control with Laue-geometry photonic crystals
We propose and experimentally demonstrate an integrated approach to suppress Kerr self-focusing by engineering the spatial dispersion of a medium using photonic crystals of Laue geometry (Laue-type PhC). The PhC, featuring longitudinally chirped and constant-period sections, was designed using a bea...
| Autores: | , , , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2025 |
| País: | España |
| Institución: | Universitat Politècnica de Catalunya (UPC) |
| Repositorio: | UPCommons. Portal del coneixement obert de la UPC |
| Idioma: | inglés |
| OAI Identifier: | oai:upcommons.upc.edu:2117/449203 |
| Acceso en línea: | https://hdl.handle.net/2117/449203 https://dx.doi.org/10.1364/OE.575375 |
| Access Level: | acceso abierto |
| Palabra clave: | Àrees temàtiques de la UPC::Ciències de la visió::Òptica física |
| Sumario: | We propose and experimentally demonstrate an integrated approach to suppress Kerr self-focusing by engineering the spatial dispersion of a medium using photonic crystals of Laue geometry (Laue-type PhC). The PhC, featuring longitudinally chirped and constant-period sections, was designed using a beam-propagation model and fabricated within a UV-fused silica substrate via femtosecond direct laser writing with a Bessel beam. We characterized the structure by performing nonlinear transmission measurements and analyzing the output beam profile evolution as a function of input pulse energy. Compared to a non-resonant reference structure and the bulk material, the dispersion-engineered PhC successfully counteracts self-focusing, resulting in a 12% increase in the nonlinear absorption threshold. This work presents the first practical demonstration of nonlinearity management through spatial dispersion control in a monolithic PhC, offering a new pathway to bypass the power-scaling limitations of nonlinear processes in solid-state materials. |
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