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Thermally reconfigurable metalens.

Anna Archetti¹, Ren-Jie Lin¹, Nathanaël Restori¹

¹Laboratory of Nanoscience for Energy Technologies (LNET), STI, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne 1015, Switzerland.

Nanophotonics (Berlin, Germany)

|September 5, 2022

Summary

This study presents a novel silicon metalens that can be thermally tuned. This reconfigurable metalens demonstrates continuous focal length modulation, offering potential for advanced optical systems.

Keywords:

dielectric nanoresonators metasurfaces thermo-optical effects tunable metalenses

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Area of Science:

Nanophotonics
Metasurfaces
Optical Engineering

Background:

Reconfigurable metalenses are compact optical components utilizing meta-atom arrays for advanced applications.
Thermo-optical effects in silicon nanoresonators offer a viable strategy for tunable meta-atoms.

Purpose of the Study:

To design and demonstrate a proof-of-concept thermo-optically reconfigurable silicon metalens.
To investigate the focal length modulation capabilities of the metalens using thermal control.

Main Methods:

Design of an ultrathin (300 nm) silicon metalens operating at 632 nm.
Utilizing thermo-optical effects in resonant silicon nanoresonators for meta-atom tuning.
Characterization of focal length modulation under varying temperatures (20 °C to 260 °C).

Main Results:

Demonstrated continuous, linear focal length modulation of up to 21% (165 μm to 135 μm).
Achieved an average conversion efficiency of 26% for right-circularly polarized light.
Metalens exhibited diffraction-limited performance.

Conclusions:

The developed silicon metalens is thermo-optically reconfigurable, showing significant focal length tunability.
The approach holds promise for future active metasurfaces and advanced optical systems, potentially enhanced by machine learning.
This work opens avenues in thermo-nanophotonics for novel optical component design.