Microgrooves Array on Phase-Change Germanium-Antimony-Tellurium Alloys Nanofilm THz Detector

Instead of utilizing commercial detectors and a detection scheme based on 2-D layer semiconductors or surface plasmon enhancement effect, we have developed a novel terahertz (THz) detector consisting of an array of microgrooves. This device combines the exceptional performance of materials with the localized surface plasmon (LSP) effect in a sub-wavelength structure electromagnetic-induced well detector. At room temperature, our device achieves a detectivity (
${D}^{\ast }$
) of
${6.3} \times {10}^{{8}}$
cm Hz
$^{\text {1/2}}$
pW
$^{-{1}}$
and a responsivity (Rv) of
${3.31} \times {10}^{{5}}$
V
$\text{W}^{-{1}}$
at 0.1 THz, with a
$20 \mu \text{m}$
line spacing array. Furthermore, the effective detection area of our device is
$6.5\times2$
mm, making it much more suitable for practical applications. These high-performance THz wave photodetectors open up possibilities for the effective detection of THz waves, which have wide-ranging applications in areas such as high-capacity communications, THz radar, biological diagnosis, and THz detection.