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Electrochemical Strategy for High-Resolution Nanostructures in Laser-Heat-Mode Resist Toward Next Generation
Zhengwei Wang1,2, Guodong Chen1,2, Ming Wen3
1Laboratory of Micro-Nano Optoelectronic Materials and Devices, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, 201800, China.
Small (Weinheim an Der Bergstrasse, Germany)
|March 23, 2022
Summary
This study introduces an eco-friendly electrochemical method using AgInSbTe-based laser heat-mode resist (AIST-LHR) to create high-resolution nanostructures for diffractive optical elements (DOEs). The process achieves fine features down to 41 nm, demonstrating potential for advanced optical applications.
Area of Science:
- Materials Science and Engineering
- Nanotechnology
- Optical Engineering
Background:
- Developing high-resolution nanostructures is crucial for next-generation diffractive optical elements (DOEs).
- Existing fabrication methods often involve complex or environmentally hazardous processes.
- There is a need for scalable, precise, and green nanofabrication techniques.
Purpose of the Study:
- To propose and develop an environmentally friendly electrochemical strategy for fabricating high-resolution nanostructures.
- To utilize the unique properties of AgInSbTe-based laser heat-mode resist (AIST-LHR) for nanostructure generation.
- To demonstrate the feasibility of transferring these nanostructures onto a silica substrate for DOE applications.
Main Methods:
- An electrochemical development strategy was employed using AgInSbTe-based laser heat-mode resist (AIST-LHR).
- Exploited the electrical resistivity difference between amorphous and crystalline phases of AIST-LHR.
- Achieved high etching selectivity (≈30:1) via Fe3+ oxidation and Cl- assisted pitting activation etching in an acidic medium, followed by plasma etching for substrate transfer.
Main Results:
- Successfully generated nanostructures with a minimum feature size of 41 nm.
- Fabricated various patterns including grating patterns, meta-surface optical structures, gears, and English characters.
- Transferred 80 nm line-space X-ray grating patterns onto a silica substrate, showcasing DOE potential.
Conclusions:
- The developed electrochemical method offers an efficient and environmentally friendly route for high-resolution nanostructure fabrication.
- AIST-LHR exhibits excellent etching selectivity, enabling precise pattern generation for advanced optical devices.
- The demonstrated transfer process highlights the technology's applicability in creating functional diffractive optical elements.
