Single Photon Sensitive HgCdTe Avalanche Photodiode Detector (APD)

Award Information
Agency:
National Aeronautics and Space Administration
Branch
n/a
Amount:
$599,984.00
Award Year:
2008
Program:
SBIR
Phase:
Phase II
Contract:
NNX08CA29C
Agency Tracking Number:
066861
Solicitation Year:
2006
Solicitation Topic Code:
S6.02
Solicitation Number:
n/a
Small Business Information
Voxtel, Inc.
12725 SW Millikan Way, Suite 230, Beaverton, OR, 97005-1687
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
124348652
Principal Investigator:
Andrew Huntington
Principal Investigator
(971) 223-5646
andrew@voxtel-inc.com
Business Contact:
George Williams
Business Official
(971) 223-5646
georgew@voxtel-inc.com
Research Institution:
n/a
Abstract
Leveraging Phase I SBIR successes, in Phase II, a single photon sensitive LIDAR receiver will be fabricated and delivered to NASA. In Phase I, high-gain, electron-initiated avalanche photodiodes (e-APDS) were designed, manufactured, and characterized over a range of temperatures. The e-APDs, sensitive from 1064 nm to 4300 nm, were fabricated in single-layer p-type HgCdTe films grown using liquid phase epitaxy on IR-transparent CdZnTe substrates. Variable-diameter e-APDs, large-area 250-micron diameter e-APDs, and segmented 1-mm x 1-mm e-APDS - each with sixteen 250-micron x 250-micron pixel elements - were mounted to ceramic submounts, tested, and characterized. Under receiver bias, the e-APDs exhibited exponentially increasing gain that exceeded 1250. The devices showed exponentially increasing gain as a function of cutoff wavelength, and with decreased temperature - in agreement with our models for HgCdTe e-APDs. In Phase II, we will optimize HgCdTe films for 1.5–3.6 micron response and fabricate 250-micron diameter e-APD elements, designed for operation with gains exceeding 1250, without excess noise. These e-APDs, when integrated with custom-designed <100 e- rms noise transimpedance amplifiers and optimized to match the e-APDs' capacitance, will realize single photon sensitive LIDAR receivers for NASA LIDAR applications.

* information listed above is at the time of submission.

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