期刊
MICROMACHINES
卷 5, 期 4, 页码 825-838出版社
MDPI
DOI: 10.3390/mi5040825
关键词
silica; ultrafast processes in condensed matter; laser-induced chemistry; femtosecond phenomena
类别
资金
- Agence Nationale pour la Recherche [ANR-09-BLAN-0172-01]
- RTRA Triangle de la Physique (Reseau Thematique de Recherche Avancee) [2008-056T]
- FP7-PEOPLE-IRSES e-FLAG [247635]
- Australian Research Council (ARC) [ARC FT110100116, DP120104035]
Recently, we showed that femtosecond laser induced nanogratings consist of thin regions with a low refractive index (Delta n = -0.15), due to the formation of nanoporous silica surrounded by regions with a positive index change. In this paper, we investigate a wide range of laser parameters to achieve very high retardance within a single layer; as much as 350 nm lambda = 546 nm but also to minimize the competing losses. We show that the total retardance depends on the number of layers present and can be accumulated in the direction of laser propagation to values higher than 1600 nm. This opens the door to using these nanostructures as refined building blocks for novel optical elements based on strong retardance.
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