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Updated: Jun 15, 2025
11:10
Atomic Layer Deposition of Vanadium Dioxide and a Temperature-dependent Optical Model
Published on: May 23, 2018
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Engineering of Active and Passive Loss in High-Quality-Factor Vanadium Dioxide-Based BIC Metasurfaces
Andreas Aigner1, Filip Ligmajer2,3, Katarína Rovenská2,3
1Chair in Hybrid Nanosystems, Nano-Institute Munich, Faculty of Physics, Ludwig-Maximilians-University Munich, Munich 80539, Germany.
Nano Letters
|August 27, 2024
Summary
This study introduces a novel active metasurface that precisely controls both near-field and far-field properties. It enables independent tuning of radiative and nonradiative losses for enhanced nanophotonic applications.
Area of Science:
- Nanophotonics
- Metasurface Technology
- Optical Engineering
Background:
- Active metasurfaces are crucial for nanophotonics, but current methods primarily tune far-field responses.
- Existing techniques offer limited control over essential near-field properties like local field enhancement and absorbance.
- Independent control of radiative and nonradiative losses remains a significant challenge in metasurface design.
Purpose of the Study:
- To develop an active metasurface capable of independently controlling radiative and nonradiative losses.
- To demonstrate precise adjustment of both far-field and near-field characteristics of metasurfaces.
- To achieve continuous tuning of metasurface properties for advanced optical applications.
Main Methods:
- Combining temperature-tunable losses in vanadium dioxide with symmetry-protected bound states in the continuum.
- Utilizing far-field coupling to tune bound states in the continuum.
- Experimentally demonstrating continuous tuning of coupling regimes (under-, critical-, and overcoupling).
Main Results:
- Achieved independent control over radiative and nonradiative losses.
- Demonstrated precise adjustment of far-field and near-field responses, including local field enhancement and absorbance.
- Experimentally realized quality factors of 200 and a relative switching contrast of 78%.
Conclusions:
- The developed active metasurface offers unprecedented control over both near- and far-field optical properties.
- This approach represents a significant advancement for highly tunable metasurfaces.
- Enables new possibilities for nanophotonic devices requiring precise control over light-matter interactions.
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