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Electrically Tunable All-PCM Visible Plasmonics.

Kandammathe Valiyaveedu Sreekanth^1,2, Rohit Medwal³, Chandreyee M Das^4,5

¹Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371, Singapore.

|April 26, 2021

Summary

This summary is machine-generated.

Researchers achieved tunable plasmonic resonances in the visible spectrum using antimony telluride (Sb₂Te₃). This breakthrough enables electrically tunable nanophotonic devices, paving the way for active color filters.

Keywords:

Chalcogenide phase change material Electrical control of visible plasmonics Metasurfaces Microheaters Plasmonics

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Area of Science:

Nanophotonics
Materials Science
Optoelectronics

Background:

Electrically tunable plasmonic resonances are crucial for active nanophotonic devices, particularly in the ultraviolet (UV) to visible spectrum.
Existing plasmonic materials lack tunability in the UV-visible range, limiting device applications.

Purpose of the Study:

To experimentally demonstrate tunable plasmonic resonances at visible wavelengths.
To explore the use of antimony telluride (Sb₂Te₃) as a tunable plasmonic material.
To develop electrically tunable nanophotonic devices for applications like active color filters.

Main Methods:

Utilized antimony telluride (Sb₂Te₃), a chalcogenide semiconductor alloy, switching its structural phase from amorphous to crystalline.
Fabricated one- and two-dimensional periodic nanostructures in Sb₂Te₃ thin films.
Integrated a microheater with the Sb₂Te₃/Si device to demonstrate electrical tunability.

Main Results:

Demonstrated tunable plasmonic resonances at visible wavelengths by phase switching Sb₂Te₃.
Excited propagating surface plasmons with a high figure of merit in both amorphous and crystalline Sb₂Te₃.
Achieved polarization-dependent and -independent resonances using 1D and 2D nanostructures, respectively.
Showcased electrically tunable plasmonic resonances via a microheater integration.

Conclusions:

Antimony telluride (Sb₂Te₃) enables tunable plasmonic resonances in the visible spectrum through structural phase transitions.
The developed Sb₂Te₃-based devices offer electrically tunable plasmonic properties.
These findings open possibilities for active color filters and other advanced nanophotonic applications.