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

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

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Microdisk array based Weyl semimetal nanofilm terahertz detector.

Qi Song^1,2, Zhiwen Zhou¹, Gangyi Zhu³

¹College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, China.

Nanophotonics (Berlin, Germany)

|December 5, 2024

Summary

This summary is machine-generated.

Researchers developed advanced terahertz wave detectors using WTe2 nanofilms and microdisk arrays. These room-temperature detectors show enhanced sensitivity and performance for diverse applications.

Keywords:

Weyl semimetal microdisk array terahertz detector

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Area of Science:

Materials Science
Condensed Matter Physics
Optoelectronics

Background:

High-performance terahertz (THz) wave detectors operating at room temperature are crucial for applications like communications and sensing.
Existing THz detectors often suffer from low sensitivity, limited spectral range, complex designs, and high noise equivalent power (NEP).

Purpose of the Study:

To demonstrate a novel Weyl semimetal surface plasmon-enhanced THz detector.
To achieve high-performance THz detection at room temperature using WTe2 nanofilms and microdisk arrays.

Main Methods:

Epitaxial growth of WTe2 nanofilms on a GaN substrate.
Fabrication of a microdisk array structure integrated with the WTe2 nanofilm.
Utilizing surface plasmon polaritons generated at the WTe2-air interface to enhance THz wave absorption.

Main Results:

Achieved a high detectivity (D*) of 5.52 × 10^12 cm Hz^1/2 pW^-1 at 0.1 THz for a 40 μm diameter microdisk array at room temperature.
Obtained a responsivity (R_A) of 8.78 A W^-1.
Demonstrated significant improvement in detector performance due to surface plasmon enhancement.

Conclusions:

The developed WTe2-based microdisk array detectors offer a promising solution for high-performance room-temperature THz sensing.
These detectors exhibit potential for applications in high-capacity communications, security screening, biological diagnostics, spectroscopy, and remote sensing.