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Design, Fabrication, and Experimental Characterization of Plasmonic Photoconductive Terahertz Emitters

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GST plasmonic gap structure investigation as a switch and sensor.

Arya Zareizadeh, Najmeh Nozhat

|September 14, 2023

Summary

This study introduces a novel plasmonic perfect absorber designed as a switch and sensor. It demonstrates high extinction ratios for switching and excellent sensitivity for detecting cancer cells and glucose solutions.

Area of Science:

Plasmonics
Nanophotonics
Metamaterials

Background:

Plasmonic perfect absorbers offer unique light-matter interaction properties.
Phase change materials enable tunable optical responses.
Developing efficient sensors and switches is crucial for various applications.

Purpose of the Study:

To investigate a plasmonic perfect absorber as a switch and sensor in the near-infrared (NIR) region.
To utilize the phase change material germanium-antimony-tellurium (GST) for switching capabilities.
To evaluate the sensing performance for biological and chemical analytes.

Main Methods:

Fabrication of a gold rectangular bar with three gaps.
Integration of germanium-antimony-tellurium (GST) into two gaps for switching.

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Characterization of optical properties and sensing performance in the NIR region.

Main Results:

Achieved a high extinction ratio of 18.49 dB for switching using GST.
Demonstrated high sensitivity of 1504 nm/RIU for PC12 cancer cell detection.
Obtained a figure of merit around 17 RIU⁻¹ for sensing applications.

Conclusions:

The proposed plasmonic perfect absorber functions effectively as a switch and sensor.
GST integration provides efficient switching with a significant extinction ratio.
The structure shows promise for sensitive detection of cancer cells and glucose solutions.