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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
Published on: June 7, 2019
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Ultrathin and multicolour optical cavities with embedded metasurfaces
Amr M Shaltout1,2, Jongbum Kim1,3, Alexandra Boltasseva1
1School of Electrical & Computer Engineering and Birck Nanotechnology Center, Purdue University, West Lafayette, Indiana, 47907, USA.
Nature Communications
|July 12, 2018
Summary
Photonic metasurfaces enable thinner optical systems by embedding them in nanocavities. This novel approach reduces cavity thickness below conventional limits, allowing for compact, high-performance optical devices.
Area of Science:
- Photonics and Nanotechnology
- Integrated Optics
- Optical Metasurfaces
Background:
- Photonic metasurfaces offer advanced light control.
- Integrated optical systems require miniaturization.
- Optical cavities are fundamental optical elements.
Purpose of the Study:
- To demonstrate metasurfaces for reducing integrated optical system dimensions.
- To embed metasurfaces within optical cavities to scale down thickness.
- To explore tunable multi-band resonances in metasurface-based nanocavities.
Main Methods:
- Modifying the Fabry-Pérot interferometric principle.
- Embedding nanostructured metasurfaces within 100-nm nanocavities.
- Experimental demonstration of colour filtering and spectral imaging.
Main Results:
- Metasurface-based nanocavity thickness reduced below the conventional λ/(2n) minimum.
- Independently tunable resonances at multiple bands achieved.
- High spatial resolution colour filtering and spectral imaging demonstrated.
Conclusions:
- The proposed approach enables drastic scaling-down of optical cavity thickness.
- Metasurface integration offers a pathway to compact, on-a-chip optical systems.
- Potential applications include VCSELs, spatial light modulators, imaging spectroscopy, and biosensors.
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