Efficient GHz Surface-Normal Modulators for SWIR ToF Imagers
Abstract
Create and test efficient modulators that can achieve over 1 GHz bandwidth for SWIR (short wave infrared) Time of Flight (ToF) imaging. The work consists of 5 tasks: TASK-1: Modulator Design and Modeling - model the optical absorption versus external electric field and wavelength and the electrical, thermal, and electro-optical properties of the device. TASK-2: Epitaxial Growth and Characterization. Wafers of GaInAsP/GaInAsSb/AlInAs/InP modulator structures will be epitaxially grown. The epitaxial layers will be evaluated using structural, optical, and electrical methods such as x-ray diffraction, secondary ion mass spectrometry (SIMS), Hall measurement, CV characterization, and photoluminescence. TASK-3: Modulator Processing and testing - fabricate and test high-speed modulators with concentration on developing low resistance contacts. Also develop transparent conductive layers to significantly enhance the lateral conductivity, and hence uniformity over large area devices at GHz, and to develop anti-reflection coatings with large field of view. TASK-4: Modulator Characterization - Measure key electrical, optical, electro-optical properties of the processed modulators. TASK-5: System Integration and Evaluation - design and implement SWIR optics, active illumination system, high-speed electronics, and modulator controller and evaluate the key performance parameter of the ToF, including the depth resolution and power consumption versus modulation frequency.
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Feb 06, 2017
- Source ID
- W911NF1610458
Entities
People
- Hooman Mohseni
Organizations
- Army Contracting Command
- Defense Advanced Research Projects Agency
- Northwestern University