Two-spherical-wave ultraviolet interferometer for making an antireflective subwavelength periodic pattern on a curved
Akio Mizutani1, Shumpei Takahira, Hisao Kikuta
1Graduate School of Engineering, Osaka Prefecture University, 1-1, Gakuen-cho, Naka-ku, Sakai, Osaka 599-8531, Japan. mizutani@me.osakafu-u.ac.jp
Applied Optics
|November 12, 2010
Summary
A novel ultraviolet two-spherical-wave interferometer suppresses fringe period changes for subwavelength structuring on curved surfaces. This method significantly reduces pattern distortion compared to traditional interferometers.
Area of Science:
- Optics and Photonics
- Nanofabrication
- Surface Metrology
Background:
- Creating subwavelength structures on curved surfaces presents challenges due to fringe period variations.
- Conventional two-plane-wave interferometers exhibit significant fringe period changes on curved substrates.
Purpose of the Study:
- To develop and demonstrate an ultraviolet two-spherical-wave interferometer for precise subwavelength surface structuring on curved surfaces.
- To investigate methods for suppressing fringe period changes during the fabrication process.
Main Methods:
- Development of an ultraviolet two-spherical-wave interferometer.
- Optical setup design focused on minimizing fringe period variation.
- Numerical simulations to analyze the interferometer's performance.
- Experimental demonstration on a concave spherical surface.
Main Results:
- The two-spherical-wave interferometer significantly suppressed fringe period changes compared to a two-plane-wave setup.
- Numerical simulations confirmed the effectiveness of the proposed optical setup.
- Experimental results showed a reduction in photoresist pattern period change to 12 nm for a target period of 250 nm on a 11.1 mm radius concave surface.
Conclusions:
- The ultraviolet two-spherical-wave interferometer is effective for fabricating subwavelength structures on curved surfaces with high precision.
- The developed optical setup successfully minimizes fringe period distortion, enabling accurate nanofabrication.
- This technology offers a promising solution for advanced optical component manufacturing.
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