Abstract
In this work, we have studied the effect of AuGe alloy nanoparticles deposition on properties of molecular beam epitaxy grown heptalayer coupled InGaAs 5.25 mono-layer quantum-dots (QDs) samples. AuGe 12 nm film was deposited using electron beam evaporator on these samples which were later annealed at 300 °C to create AuGe nanoparticles. SEM measurement confirms formation of AuGe nanoparticles which support surface Plasmon modes. The PL spectra at 20K confirms maximum enhancement of 53% in intensity of peak at ∼1123 nm for 300 °C annealed sample in comparison to as-grown (without nanoparticle) sample. Single pixel detectors were fabricated from asgrown and 300°C annealed nanoparticle sample using two level lithography and wet etching process. We have observed two-order and one-order augmentation in responsivity and detectivity from device having nanoparticles compared to the as-grown respectively at 80K. Peak detectivity of 4.2×107cm.Hz 1/2/W at 80K was observed for device having nanoparticles. Around 30% increment in spectral response having peak around 5μm at-1V bias for device having AuGe nanoparticles compared to the as-grown device was observed. The observed enhancement is due to increase light trapping or light scattering into the device by nanoparticles. Demonstration of this plasmonic-based detector will move forward the development of high-performance infrared QDs detectors.
Original language | English (US) |
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Title of host publication | Plasmonics |
Subtitle of host publication | Design, Materials, Fabrication, Characterization, and Applications XIV |
Editors | Satoshi Kawata, Din Ping Tsai |
Publisher | SPIE |
Volume | 9921 |
ISBN (Electronic) | 9781510602335 |
DOIs | |
State | Published - Jan 1 2016 |
Event | 2016 SPIE Optics + Photonics Conference on Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIV - San Diego, United States Duration: Aug 28 2016 → Sep 1 2016 |
Other
Other | 2016 SPIE Optics + Photonics Conference on Plasmonics: Design, Materials, Fabrication, Characterization, and Applications XIV |
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Country | United States |
City | San Diego |
Period | 8/28/16 → 9/1/16 |
Keywords
- AuGe nanoparticles
- InGaAs QDs
- MBE
- PL
- QDIPs