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Efficient nanostructuring of glass with elliptically polarized pulses

Efficient nanostructuring of glass with elliptically polarized pulses
a, Birefringence images of laser patterns written in silica glass with linearly and elliptically polarized pulses. b, Scanning electron microscope (SEM) images of corresponding nanopore structures. Credit: Yuhao Lei, Gholamreza Shayeganrad, Huijun Wang, Masaaki Sakakura, Yanhao Yu, Lei Wang, Dmitrii Kliukin, Linards Skuja, Yuri Svirko, and Peter G. Kazansky

Photoexcitation, and especially photoionization, is one of the most important manifestations of the light-matter interaction in nature, ranging from photosynthesis in plants and vision in biology to photography and laser processing of materials. It is generally accepted that the change in a substance is weaker the less light is absorbed. However, researchers found that this is not always the case.

In a new paper published in Light: Science & Applications, a team of scientists, led by Professor Peter G. Kazansky from Optoelectronics Research Center, University of Southampton, U.K., and co-workers have demonstrated efficient ultrafast laser nanostructuring with elliptical polarization in . Despite the nonlinear absorption being about 2.5 times weaker, elliptically polarized pulses result in about twice the birefringence of linearly polarized light. Anisotropic nanopores with a larger concentration are observed with elliptically polarized pulses. The phenomenon is interpreted in terms of enhanced interaction of circularly polarized light with a network of randomly oriented bonds and hole polarons in silica glass, as well as an efficient tunneling ionization of defects with low excitation potentials by circular polarization.

"It is commonly believed that the multiphoton ionization dominates in ultrafast laser writing in transparent materials, but we revealed that tunneling excitation of laser induced defects, such as self-trapped holes, is a key for nanostructuring in silica glass," the scientists added.

"In 5D , information can be recorded by elliptically polarized pulses with lower energy and higher writing speed. Moreover, our demonstration allows production of large area geometric phase optical elements and vector beam converters with ultrahigh transmittance for and UV lasers," they write.

More information: Yuhao Lei et al, Efficient ultrafast laser writing with elliptical polarization, Light: Science & Applications (2023). DOI: 10.1038/s41377-023-01098-2

Journal information: Light: Science & Applications

Citation: Efficient nanostructuring of glass with elliptically polarized pulses (2023, April 4) retrieved 20 July 2024 from https://phys.org/news/2023-04-efficient-nanostructuring-glass-elliptically-polarized.html
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