Optical Limiting with Nanocrystalline Materials

Award Information
Agency:
Department of Defense
Branch
Army
Amount:
$729,999.00
Award Year:
2003
Program:
SBIR
Phase:
Phase II
Contract:
DAAE07-03-C-L050
Agency Tracking Number:
A012-1257
Solicitation Year:
n/a
Solicitation Topic Code:
n/a
Solicitation Number:
n/a
Small Business Information
EIC LABORATORIES, INC.
111 Downey Street, Norwood, MA, 02062
Hubzone Owned:
N
Socially and Economically Disadvantaged:
N
Woman Owned:
N
Duns:
076603836
Principal Investigator:
Steven Pullins
Senior Scientist
(781) 769-9450
pullins@eiclabs.com
Business Contact:
R. Rauh
President
(781) 769-9450
drauh@eiclabs.com
Research Institution:
n/a
Abstract
Broadband visible optical limiting filters will be an essential element for soldier protection in the future battlefield environment. New materials are required that provide protection for the eye for pulses >0.5 mJ. We propose to use suspensions ofunaggregated absorbing nanoparticles for optical limiting. Such nanoparticles can exhibit optical limiting by several mechanisims, including charge trapping inducing plasmon and donor/acceptor absorption, and local heating leading to formation of lightscattering microplasmas. In Phase I, using new synthetic methods for semiconductor nanoparticles we prepared a selection of broad band absorbing monodisperse (1-10 nm diameter) particles of several candidate semiconductors and evaluated their opticallimiting behavior in comparison to polydisperse C suspensions. A multiwavelength nanosecond characterization facility was established at EIC with capabilities of measuring between 225 nm to 1625 nm over six orders of input fluence. Several newnanocrystalline systems were identified that provide substantial advantages over prior art for broadband protection. Phase II will entail adding improved automation and imaging capabilities to the instrumentation, synthesizing an expanded group ofnanomaterials and size distributions, developing the concept of sensitized nanocrystals for wide dynamic range optical limiting, and developing solid matrices for creating filter elements with a low damage threshold.The new filters have government marketsfor eye protection of military personnel, including individual eyewear and inclusion in sights and periscopes, as well as for sensor protection in terrestrial and satellites imaging systems. Commercial markets include laser safety eyewear and as protectionfor cameras and optical instruments.

* information listed above is at the time of submission.

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