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Surface-relief gratings with high spatial frequency fabricated using direct glass imprinting process
1Konica Minolta Opto Inc, Hyogo, Japan.
High-frequency surface gratings were fabricated on phosphate glass using direct imprinting. This method achieved a 730 nm grating height and 500 nm period, demonstrating potential for optical applications.
Area of Science:
- Materials Science
- Optics
- Nanotechnology
Background:
- Surface-relief gratings are crucial optical components.
- Fabrication of high-frequency gratings on glass presents challenges.
Purpose of the Study:
- To develop a novel method for fabricating high-spatial-frequency surface gratings on phosphate glass.
- To characterize the fabricated gratings and their optical properties.
Main Methods:
- Direct imprinting process utilizing a glassy carbon mold.
- Softening temperature of phosphate glass was employed for imprinting.
- Constant pressure of 0.4 kN/cm² was applied during fabrication.
Main Results:
- Successfully fabricated surface-relief gratings with a 500 nm period and 730 nm maximum height.
- Observed a phase retardation of 0.1 lambda between TE and TM polarized light at 600 nm wavelength.
Conclusions:
- Direct imprinting at the softening temperature is an effective method for creating high-frequency gratings on phosphate glass.
- The fabricated gratings exhibit polarization-dependent optical properties, suitable for optical devices.
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