Terahertz optoelectronics with surface plasmon polariton diode.

Area of Science:

• Plasmonics
• Optoelectronics
• Semiconductor physics

Background:

• Plasmonics offers new physical effects and applications.
• Surface plasmon polaritons (collective electron oscillations at metal/dielectric interfaces) are key for optoelectronic integration.
• A fast switching mechanism is crucial for bridging electronic and photonic devices.

Purpose of the Study:

• To demonstrate a novel surface plasmon-polariton diode (SPPD) for high-speed optoelectronic switching.
• To investigate the potential of SPPDs for signal modulation at THz frequencies.
• To assess the compatibility of SPPDs with semiconductor fabrication techniques.

Main Methods:

• Fabrication of a surface plasmon-polariton diode (SPPD) using a heavily doped p-n junction of GaAs.
• Utilizing surface plasmon polaritons propagating at the n-type/p-type GaAs interface.
• Employing external voltage for switching and modulation of the SPPD.

Main Results:

• Demonstrated an optoelectronic switch with transmission modulation exceeding 98%.
• Achieved switching rates up to 1 THz, dependent on doping and applied voltage.
• Confirmed compatibility with current semiconductor fabrication processes.

Conclusions:

• The developed SPPD functions as a high-performance optoelectronic switch.
• SPPDs offer a pathway to ultra-fast signal modulation for future nanoscale optoelectronics.
• The technology integrates plasmonic effects with semiconductor devices for advanced applications.