In the Heart of Femtosecond Laser Induced Nanogratings: From Porous Nanoplanes to Form Birefringence

• 作者: B. Poumellec F. Brisset M. Lancry R. Desmarchelier S. Mazerat
• 来源期刊: 纳米科学与工程(英文)
• 学科: 医学
• 关键词: SILICA GLASSES NANOPOROUS FEMTOSECOND Laser Processing BIREFRINGENCE Nanogratings
• 年，卷（期）: 2015,（4）
• 页码范围: 115-125
• 页数: 11页
• 分类号: R73

摘要

It is demonstrated that the form birefringence related to the so-called nanogratings is quantitatively correlated to the porosity-filling factor of these nanostructures. We reveal that matters surrounding the nanopores exhibit significant refractive index decrease which is likely due to the fictive temperature increase and/or the presence of a significant amount of interstitial O2. The control of the porosity was achieved by adjusting the laser pulse energy and the number of pulses/micron i.e. the overlapping rate. Applications can be numerous in fast material processing by the production of nanoporous matter, and photonics by changing the optical properties.