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Schottky-contact plasmonic dipole rectenna concept for biosensing.
Mohammad Alavirad1, Saba Siadat Mousavi, Langis Roy
1Department of Electronics, Carleton University, 1125 Colonel By Dr., Ottawa, ON, K1S 5B6, Canada.
Optics Express
|March 14, 2013
Summary
We developed nanoantennas for photodetection and biosensing. These metal nano-dipole antennas integrated with silicon photodetectors show high responsivity and sensitivity for infrared applications.
Area of Science:
- Nanophotonics
- Plasmonics
- Optoelectronics
Background:
- Nanoantennas are crucial for photodetection and biosensing.
- Surface plasmon polaritons (SPPs) enable light manipulation at the nanoscale.
Purpose of the Study:
- To present an array of metal nano-dipoles for enhanced photodetection and biosensing.
- To investigate the performance of nanoantennas integrated into silicon photodetectors.
Main Methods:
- Integration of metal nano-dipole antennas with silicon-based Schottky-contact photodetectors.
- Excitation of SPPs on gold nanowires and subsequent hot carrier generation.
- Application of a transmission line model to analyze antenna performance and sensitivities.
Main Results:
- Achieved high responsivities (100 mA/W) and low detectable powers (-12 dBm) at 1310 nm.
- Predicted bulk sensitivity of ~250 nm/RIU and surface sensitivity of ~8 nm/nm in water.
- Demonstrated that dipole antennas offer significantly higher sensitivities than monopoles due to enhanced electric fields in the gap.
Conclusions:
- The proposed nanoantenna-integrated photodetector is promising for infrared photodetection.
- The developed device shows potential for highly sensitive biosensing applications.
- Analytical formulas were derived to predict antenna sensitivities, aiding future device design.
