Adaptive Optoelectronic Eye
Abstract
The objective of this multidisciplinary research program was to develop a versatile image sensor technology where advances in optical devices and merging of optoelectronic, micro-optic and micromechanical components would allow the feasibility of tightly coupled adaptive focal plan arrays. We adopted a layered architecture in which the essential elements were: The front-end optics consisting of a variable focus Fresnel lens, a microlens array and a microprism array for color dispersion and adaptation: photoreception and transmission array consisting of low-power and high-power phototransceiver arrays; and information processing with vertical fan-out via multiple-stacked SiGe/Si photoreceivers. A dual focus Fresnel lens and micromachined platform for steering optical elements were demonstrated. A color adaptation model was tested with micromachined platforms. We designed, fabricated and demonstrated novel microcavity LEDs and VCSELs with quantum well and quantum dot active regions. These devices have been used to realize ultra-low power phototransceivers (10 nW input power, 110 microwatt(s) power dissipation) with 18 dB gain. This is the first demonstration of an ultra-low power phototransceiver which can be used in dense arrays for imaging applications. We have also demonstrated multi-channel SiGe/Si photoreceiver arrays with greater than or equal to 1 GHz bandwidth for electronic processing of the optically imaged signals.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 23, 2003
- Accession Number
- ADA419124
Entities
People
- Pallab K. Bhattacharya
Organizations
- University of Michigan