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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

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Ultrathin BIC Metasurfaces Based on Ultra-Low-Loss Sb₂Se₃ Phase-Change Material.

Zhaoyang Xie¹, Chi Li¹, Krishna Murali²

¹School of Physics and Astronomy, Faculty of Science, Monash University, Melbourne, Victoria 3800, Australia.

|December 19, 2024

Summary

This summary is machine-generated.

Ultrathin, low-loss phase-change materials enable tunable metasurfaces for advanced photonic applications. These novel materials offer high performance in the near-infrared region, paving the way for optical modulators and sensors.

Keywords:

bound states in the continuum phase-change metasurfaces photoluminescence modulation tunable metasurfaces

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Area of Science:

Photonics and Materials Science
Metasurface Engineering
Nanophotonics

Background:

Ultrathin, low-loss phase-change materials (PCMs) are crucial for reconfigurable photonic devices.
Conventional PCMs exhibit high near-infrared (NIR) losses, hindering high quality factor (Q-factor) resonant metasurface applications.
There is a need for advanced PCMs to overcome these limitations in NIR resonant metasurfaces.

Purpose of the Study:

To design and fabricate tunable bound states in the continuum (BIC) metasurfaces.
To utilize the ultra-low-loss PCM, antimony selenide (Sb2Se3), for enhanced metasurface performance.
To demonstrate the application of these metasurfaces in modulating photoluminescence.

Main Methods:

Design and fabrication of 25 nm thick BIC metasurfaces using Sb2Se3.
Characterization of metasurface modulation depth and resonance tuning in the NIR.
Experimental demonstration using rare earth-doped upconversion nanoparticles.

Main Results:

Achieved high modulation depth and broad resonance tuning in the NIR.
Obtained high Q-factors up to 130 with the ultrathin BIC metasurfaces.
Demonstrated reduced excitation power for multiphoton photoluminescence and enabled emission polarization manipulation.

Conclusions:

Developed a promising platform for active resonant metasurfaces using ultra-low-loss PCMs.
The fabricated BIC metasurfaces offer significant potential for optical modulation, ultrafast switches, color filtering, and optical sensing.
This work overcomes limitations of conventional PCMs in the NIR region for high-Q resonant applications.