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High-efficiency blazed diffractive optical elements for the violet wavelength fabricated by electron-beam
Teruhiro Shiono1, Tetsuya Hamamoto, Koji Takahara
1Storage Media Systems Development Center, Matsushita Electric Industrial Company, Ltd, Moriguchi, Osaka, Japan. shiono@drl.mei.co.jp
Applied Optics
|May 15, 2002
Summary
Researchers optimized electron-beam lithography to create blazed diffractive optical elements (DOEs) for violet light. These blazed DOEs achieved high diffraction efficiency and low aberration, showing promise for next-generation optical disk storage.
Area of Science:
- Optics and Photonics
- Nanofabrication
- Materials Science
Background:
- Diffractive optical elements (DOEs) are crucial for manipulating light.
- Violet wavelength applications require highly efficient and precise optical components.
- Electron-beam lithography offers high resolution for micro/nanofabrication.
Purpose of the Study:
- To investigate and optimize blazed diffractive optical elements (DOEs) for violet wavelengths.
- To achieve high diffraction efficiency and low wave aberration in fabricated DOEs.
- To assess the potential of these DOEs for next-generation high-density optical disk pickups.
Main Methods:
- Fabrication of blazed DOEs using electron-beam lithography.
- Optimization of electron-beam writing parameters and electron-dose distributions.
- Experimental measurement of diffraction efficiency and wave aberration.
Main Results:
- Eight types of gratings with periods from 10 to 0.54 micrometers were fabricated with excellent blazed structures.
- Measured diffraction efficiencies closely matched theoretical predictions.
- A peak diffraction efficiency of 75.6% (TE) was experimentally confirmed for a 0.54 micrometer period grating.
- A wave aberration as low as approximately 0.01 lambda (rms) was achieved for the first-order diffracted wave.
Conclusions:
- Optimized electron-beam lithography enables the fabrication of high-performance blazed DOEs for violet wavelengths.
- The fabricated DOEs exhibit high diffraction efficiency and low wave aberration, meeting stringent optical requirements.
- These blazed DOEs are suitable for use as key components in advanced high-density optical disk pickup systems.