Deutsch

Researchers have discovered a new method to improve the resolution of laser processing

818
2024-03-28 13:52:54
Übersetzung anzeigen

Customized laser beams focused through transparent glass can generate a small dot inside the material. Researchers from Northeastern University have reported a method of using this small spot to improve laser material processing and increase processing resolution.


Their research results are published in the journal Optics Letters.

Laser processing, like drilling and cutting, is crucial in industries such as automobiles, semiconductors, and pharmaceuticals. The pulse width of an ultra short pulse laser source ranges from picoseconds to femtoseconds, and can be accurately processed in the range of micrometers to tens of micrometers. But recent progress requires smaller scales, below 100 nanometers, which is difficult to achieve with existing methods.

Researchers focus on laser beams with radial polarization, known as vector beams. The beam generates a longitudinal electric field at the focal point, resulting in a smaller spot than traditional beams.

Scientists have determined that this process has great potential in laser processing. However, one drawback is that due to the light refraction at the air material interface, the field weakens inside the material, thereby limiting its use.

"We overcame this by using oil immersion lenses to laser process glass substrates," exclaimed Yuichi Kozawa, Associate Professor at the Institute of Advanced Materials Multidisciplinary Research at Northeastern University and co-author of the paper. "Because the refractive indices of oil immersed and glass are almost the same, the light passing through them will not bend."

Further research on the behavior of radially polarized beams under circular focusing indicates that the longitudinal field is greatly enhanced. This enhancement is due to total reflection occurring at high convergence angles on the back between glass and air. By using a circularly polarized beam of light, Kozawa and his colleagues created a small focal point.

From there, they applied this method to processing glass surfaces with ultra short pulse laser beams. A single shot of the converted pulse on the back of the glass substrate will produce a hole with a diameter of 67 nanometers, approximately 1/16 of the wavelength of the laser beam.

"This breakthrough makes it possible to use enhanced longitudinal electric fields for direct material processing with higher accuracy," Kozawa added. "It provides a simple method to achieve processing scales below 100 nanometers and opens up new possibilities for laser nanoprocessing in various industries and scientific fields."

Source: Laser Net

Ähnliche Empfehlungen
  • Czech imaging company Tescan collaborates with FemtoInnovations to enter the laser field

    Tescan Group, a high-performance imaging company headquartered in the Czech Republic, has acquired the ultrafast laser specialist FemtoInnovations, in a deal that will also create a new dedicated Laser Technology Business Unit (LTBU) at the University of Connecticut (UConn) Tech Park.“The new unit expands Tescan’s correlative and multimodal portfolio for semiconductor, biomedical device manufactur...

    09-27
    Übersetzung anzeigen
  • Brother launches a series of color LED laser printers for homes and offices

    Brother is an innovative global company that proudly launches its latest series of color LED laser printers. The new printer series is colorful and seamlessly connected, designed specifically for home and small office environments.The company's latest product aims to improve productivity in home and small business environments, combining excellent printing quality with excellent printing speed. Ea...

    2024-03-20
    Übersetzung anzeigen
  • Xi'an Institute of Optics and Fine Mechanics has made new progress in the research of intelligent optical microscopy imaging

    Recently, the State Key Laboratory of Transient Optics and Photonics Technology of Xi'an Institute of Optics and Fine Mechanics has made new progress in the research of intelligent optical microscopic imaging, and the research results were published online in the international high-level academic journal Opto Electronic Advances (IF: 15.3). The first author of the paper is Tian Xuan, a 2024 doctor...

    2024-09-09
    Übersetzung anzeigen
  • Westlake University has made significant breakthroughs in the field of flexible stacked solar cells

    Recently, the team led by Wang Rui from the Future Industry Research Center and the School of Engineering at Xihu University has made significant breakthroughs in the field of flexible stacked solar cells. They have successfully stacked perovskite and copper indium gallium selenide materials together, resulting in a photoelectric conversion efficiency of 23.4%. The related research paper was recen...

    02-05
    Übersetzung anzeigen
  • Quantum droplets reveal a new field of macroscopic complexity

    Scientists have advanced this field by stabilizing exciton polaritons in semiconductor photonic gratings, achieving long-lived and optically configurable quantum fluids suitable for complex system simulations.Researchers from Leicester CNR Nanotec and the School of Physics at the University of Warsaw used a new generation of semiconductor photonic gratings to optically customize the composite of q...

    2024-03-28
    Übersetzung anzeigen