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Structure and Optical Properties of Opal Films Made by an Out-of-Plane Electric Field-Assisted Capillary Deposition
Mulda Muldarisnur1, Frank Marlow2,3
1Department of Physics, Faculty of Mathematics and Natural Sciences, Universitas Andalas, Padang 25163, Indonesia.
ACS Omega
|March 14, 2022
Summary
Directed assembly using electric fields can improve the quality of self-assembled opals, which are photonic crystals. An intermediate electric field strength and a negatively charged substrate reduce defects in opal films.
Area of Science:
- Materials Science
- Nanotechnology
- Photonics
Background:
- Self-assembled opals are promising three-dimensional photonic crystals.
- Internal defects in opals limit their optical properties and applications.
- Directed assembly with external fields offers tunability in opal formation.
Purpose of the Study:
- To investigate the effect of an out-of-plane electric field on opal film formation and optical properties.
- To determine optimal electric field conditions for improving opal quality.
- To understand the role of substrate polarity in electric field-directed opal assembly.
Main Methods:
- Capillary deposition method for opal film fabrication.
- Application of an out-of-plane electric field during deposition.
- Varying electric field strength (20-30 V/cm) and substrate polarity.
Main Results:
- An intermediate electric field strength (20-30 V/cm) improves opal film quality.
- Opal quality is dependent on the bottom substrate's polarity.
- A negatively charged bottom substrate yields slightly better opal quality due to asymmetry and gravity interplay.
Conclusions:
- Electric fields can be used to tune opal formation and reduce defect content.
- Optimizing electric field parameters and substrate polarity enhances photonic crystal quality.
- This method holds potential for fabricating high-quality, defect-reduced opal films for photonic applications.
