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Optically Transparent Near-Perfect Microwave Absorber

Award Information
Agency: Department of Defense
Branch: Army
Contract: W9113M-19-C-0060
Agency Tracking Number: A2-7227
Amount: $999,931.78
Phase: Phase II
Program: SBIR
Solicitation Topic Code: A17-093
Solicitation Number: 17.1
Solicitation Year: 2017
Award Year: 2019
Award Start Date (Proposal Award Date): 2018-12-21
Award End Date (Contract End Date): 2020-12-21
Small Business Information
410 Jan Davis Drive
Huntsville, AL 35806
United States
DUNS: 625694500
HUBZone Owned: No
Woman Owned: No
Socially and Economically Disadvantaged: No
Principal Investigator
 Neset Akozbek
 Senior Research Physicist
 (256) 922-0802
Business Contact
 Lindsey McMicken
Phone: (256) 922-0802
Research Institution

Protecting electro-optical/infrared (EO/IR) sensors from electromagnetic interference (EMI) is critical for many military operations. Typically, these sensors are shielded using metal mesh and/or thin film coatings that reflect microwave frequencies but transmit the sensor operational bands. However, for platforms that require stringent radar cross-section (RCS) control, EO/IR sensors need to be placed behind RCS-compliant optical windows. This RCS requirement precludes the use of reflective EMI shielding. Additionally, current microwave absorbers are opaque to visible and IR wavelengths. To overcome these limitations, we design, fabricate, and test an optically transparent microwave absorber based on single/multi-layer graphene and silver nanowires. Our approach includes both Salisbury screen and metamaterial designs that can be tailored to meet specific optical and microwave requirements. We will explore several material combinations in the design with the goal of improved environmental and mechanical stability. Additionally, we will work toward material architectures that are amenable to high-rate manufacturing processes and can be easily retrofitted on current EO/IR sensor apertures.

* Information listed above is at the time of submission. *

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