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Surface plasmon enhanced THz emission with nanoporous gold supported CdTe
Optics Express
|July 16, 2021
Summary
Ultrafast terahertz (THz) emission is significantly boosted by plasmon resonance at semiconductor/metal interfaces. Using nanoporous gold (NPG) with cadmium telluride (CdTe) enhanced THz amplitude by tenfold, demonstrating NPG
Area of Science:
- Optoelectronics
- Materials Science
- Nanotechnology
Background:
- Terahertz (THz) emission from semiconductor/metal interfaces is enhanced by plasmon resonance.
- Nanoporous gold (NPG) offers unique plasmonic properties due to its 3D nanostructure.
Purpose of the Study:
- To investigate the impact of surface plasmons in NPG on ultrafast optoelectronic response for THz generation.
- To compare THz emission enhancement from cadmium telluride (CdTe) on NPG versus CdTe on silicon and gold film.
Main Methods:
- Fabrication of a semiconductor/metal compound using CdTe and 3D NPG.
- Excitation of the material with ultrafast laser pulses.
- Measurement and analysis of generated Terahertz (THz) emission.
Main Results:
- Observed an order of magnitude enhancement in THz amplitude from CdTe on NPG compared to CdTe on silicon.
- Demonstrated stronger plasmonic enhancement for THz emission from NPG than from a planar gold film.
Conclusions:
- The randomly nanoporous structure of NPG is highly effective for plasmonic enhancement of THz generation.
- NPG serves as a promising platform for efficient ultrafast optoelectronic devices operating in the THz range.
