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Published on: July 18, 2015
Freestanding HfO2 grating fabricated by fast atom beam etching
Yongjin Wang1, Tong Wu, Yoshiaki Kanamori
1Institute of Communication Technology, Nanjing University of Posts and Telecommunications, Nanjing, Jiang-Su 210003, People's Republic of China. wyjjy@yahoo.com.
Nanoscale Research Letters
|June 30, 2011
Summary
Researchers fabricated freestanding hafnium dioxide (HfO2) gratings using a novel etching process. These gratings show potential as single-layer dielectric reflectors, with optical responses dependent on period and polarization.
Area of Science:
- Materials Science
- Nanotechnology
- Optics
Background:
- Dielectric reflectors are crucial optical components.
- Fabricating freestanding nanostructures presents unique challenges.
- Hafnium dioxide (HfO2) is a promising material for optical applications.
Purpose of the Study:
- To develop a method for fabricating freestanding HfO2 gratings.
- To investigate the optical properties of these gratings.
Main Methods:
- Deposition of HfO2 film on a silicon substrate using electron beam evaporation.
- Pattern definition via electron beam lithography.
- Transfer of patterns to HfO2 using fast atom beam (FAB) etching.
- Removal of the silicon substrate via dry etching to create freestanding structures.
Main Results:
- Successful fabrication of freestanding HfO2 gratings.
- Experimental characterization of period- and polarization-dependent optical responses.
- Demonstration of the gratings' performance in reflectance measurements.
Conclusions:
- The developed process is effective for creating freestanding HfO2 gratings.
- These gratings are suitable for use as single-layer dielectric reflectors.
