Three Dimensional Nanopillar Optical Antenna Avalanche Detectors
Abstract
Avalanche photodetectors (APDs) operating at 1064 nm are an integral component of light detection and ranging (LiDAR) systems used in imaging technologies such as acquisition tracking and pointing (ATP) and airborne topographic mapping. Current state-of-the-art APDs utilize a separate absorption-multiplication (SAM) structure using an In0.53Ga0.47As absorber lattice-matched to an InP multiplication layer. When operated in Geiger mode, these detectors are limited by the dark count rate caused by generation current in the InGaAs, making low-temperature operation necessary. At low temperature, trap-assisted tunneling (TAT) in the InP limits the performance. Although in theory it is possible to reduce generation current in the InGaAs by reducing the indium fraction (while still effectively absorbing at 1064nm), in practice the reduction of bulk generation current is offset by the poor material quality resulting from lattice mismatched growth on InP.
Document Details
- Document Type
- Technical Report
- Publication Date
- Mar 02, 2017
- Accession Number
- AD1058678
Entities
People
- Alan C Farrell
- Diana L. Huffaker
- Pradeep N. Senanayake
Organizations
- University of California, Los Angeles