Terahertz wave modulation enhanced by laser processed PVA film on Si substrate

Scientific Reports
Weimin LiuSheng-Jiang Chang

Abstract

An optically pumped ultrasensitive broadband terahertz (THz) wave modulator based on polyvinyl alcohol (PVA) film on Si wafer was demonstrated in this work. The THz time domain spectroscopy experiments confirm that the PVA/Si can drastically enhance the photo-induced THz wave modulation on the Si surface, especially when the PVA film is heated by a high-power laser. A modulation depth of 72% can be achieved only under 0.55 W/cm2 modulated laser power, which is superior significantly to the bare Si. The numerical simulations indicate that the laser processed PVA (LP-PVA) film increases the photo-generated carrier concentration on the Si surface in two orders of magnitude higher than that of bare Si. Moreover, the modulation mechanism and the dynamic process of laser heating on the PVA/Si have been discussed. This highly efficient THz modulation mechanism and its simple fabrication method have great application potentials in THz modulators.

References

Dec 1, 2006·Nature·Hou-Tong ChenRichard D Averitt
Mar 7, 2013·Nature Communications·Mostafa ShalabyRoberto Morandotti
Mar 22, 2014·Reports on Progress in Physics·J S Langer
Nov 2, 2014·Optics Letters·Bo ZhangLiang Qin
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Apr 4, 2015·Optics Express·Sai ChenShengjiang Chang
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May 4, 2016·Nanoscale·Xiaoyong HeWangzhou Shi
Aug 19, 2016·Applied Optics·Meng ChenShengjiang Chang
Nov 1, 2016·Nanotechnology·Xiaoyong HeWangzhou Shi
Feb 22, 2017·Advanced Materials·Shaoliang YuLimin Tong

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Citations

Nov 25, 2018·Optics Express·Myong-Seong SongJoong Wook Lee
Dec 5, 2019·Scientific Reports·I R HooperE Hendry

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Methods Mentioned

BETA
chip
profiler
PCA

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