Three Pole Auston Switch Terahertz Ellipsometer

Award Information
Agency: Department of Defense
Branch: Army
Contract: W911NF-08-C-0112
Agency Tracking Number: A08A-013-0383
Amount: $100,000.00
Phase: Phase I
Program: STTR
Awards Year: 2008
Solicitation Year: 2008
Solicitation Topic Code: A08-T013
Solicitation Number: 2008.A
Small Business Information
GMATEK, INC.
3 Church Circle, Suite 266, Annapolis, MD, 21401
DUNS: 800545043
HUBZone Owned: N
Woman Owned: Y
Socially and Economically Disadvantaged: N
Principal Investigator
 R. Glenn Wright
 President
 (443) 306-3387
 glenn@gmatek.com
Business Contact
 Matthew Reiten
Title: Sr. Member of the Technical Staff
Phone: (443) 306-3387
Email: mreiten@gmatek.com
Research Institution
 JOHNS HOPKINS UNIV.
 N. P Armitage
 Dept. of Physics and Astronomy
3400 N. Charles St.
Baltimore, MD, 21218 2686
 (410) 516-0214
 Nonprofit college or university
Abstract
A new spectroscopic instrument – a time-domain terahertz ellipsometer (TDTE) – and the associated techniques for characterization of advanced materials in the terahertz (THz) spectral range will be developed. A novel three pole Auston-type switch will serve as the detector which is capable of simultaneously measuring two electric field polarizations. Standard THz time domain spectroscopy requires transmission of the beam through the test sample and will not work for opaque materials. Ellipsometry measurements with the TDTE will overcome this limitation by directly detecting the polarization change of the incident beam after reflection due to the material properties of the target surface. During Phase I, the design, fabrication, and testing of the three pole Auston switch will be implemented. The TDTE system will be designed around the three pole switch. Benchmark measurements will be performed on opaque target materials that had been previously impossible to characterize with standard transmission THz spectroscopy. In Phase II, a compact fiber coupled TDTE will be designed and constructed, suitable for laboratory and commercial environments. Advanced analysis and automation controls will enable the TDTE to perform previously impossible measurements rapidly and with high precision.

* information listed above is at the time of submission.

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