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Related Experiment Video

Updated: Jun 3, 2025

Fabrication of Ultra-thin Color Films with Highly Absorbing Media Using Oblique Angle Deposition
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Novel Deposition Technique for Fabricating Films with Customized Thickness Profiles.

Chi-Yung Hsieh1, Yu-Chi Lin1, Xuan-Shan Huang1

  • 1Department of Mechanical Engineering, National Yang Ming Chiao Tung University, Hsinchu 30010, Taiwan.

Micromachines
|January 8, 2025
PubMed
Summary

This study presents a new thin film deposition method using a shaped shadow mask and rotating sample holder. This technique enables precise control over arbitrary film thickness profiles for efficient mass production.

Keywords:
film depositiongradient thicknesslinear variable filtershadow mask

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Area of Science:

  • Materials Science
  • Thin Film Deposition
  • Nanotechnology

Background:

  • Precise control over thin film thickness is crucial for advanced optical and electronic devices.
  • Existing deposition techniques often lack the flexibility to create arbitrary thickness profiles efficiently.

Purpose of the Study:

  • To develop a novel deposition technique for fabricating thin films with arbitrary thickness profiles.
  • To demonstrate the capability of the method for creating linear and sinusoidal thickness variations.
  • To design and fabricate a linear variable filter using this technique.

Main Methods:

  • Utilized a fixed shadow mask with a custom-designed opening curve.
  • Employed a rotating sample carrier plate positioned coaxially with the shadow mask.
  • Fabricated thin films with linear gradients (49.3 and 86.8 Å/mm) and sinusoidal profiles (40 mm period).
  • Designed a linear variable filter using a quarter-wavelength stack (Si3N4/SiO2) and a TiO2 cavity layer with varying thickness.

Main Results:

  • Successfully deposited thin films with designed linear and sinusoidal thickness profiles in a single step.
  • Demonstrated the fabrication of a linear variable filter with a linearly varying thickness profile.
  • Achieved consistent thickness profiles across multiple samples positioned at different circumferential locations on the carrier plate.

Conclusions:

  • The novel deposition technique offers precise control over arbitrary thin film thickness profiles.
  • The method is efficient, requiring no complex internal chamber devices and is suitable for mass production.
  • This technique opens possibilities for advanced optical components and tailored material properties.