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Integration of Garnets and Magnets for Waveguide Isolators

Award Information

National Aeronautics and Space Administration
Award ID:
Program Year/Program:
2003 / STTR
Agency Tracking Number:
Solicitation Year:
Solicitation Topic Code:
Solicitation Number:
Small Business Information
Boston Applied Technologies, Inc.
6F Gill Street Woburn, MA 01801-1721
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Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Phase 1
Fiscal Year: 2003
Title: Integration of Garnets and Magnets for Waveguide Isolators
Agency: NASA
Contract: NAS5-03070
Award Amount: $99,984.00


This proposal will enable the most efficient integration of NASA?s semiconductor lasers into strategic optical systems. To protect laser lifetimes and increase performance, these lasers will require isolators to protect them from back-reflections, similar to the isolators in all fiber-optic networks. This work proposes to monolithically integrate magneto-optical isolators with semiconductor platforms in order to reduce the size and weight, as well as increase the performance, of NASA?s semiconductor laser systems. The important elements in an integrated isolator are 1) magneto-optical waveguides and 2) permanent magnet biasing films. Yttrium iron garnet (YIG), the strongest magneto-optical material, is very difficult to grow onto semiconductor platforms. This work will use a novel technique, metallorganic chemical liquid deposition (MOCLD) to achieve this feat. Preliminary results have demonstrated the feasibility, but not the optimization, of this technique. Permanent magnet films of SmCo have also demonstrated promise as biasing magnets in waveguide isolators. Here, SmCo films will be made using a novel in-situ nitriding technique during Sm and Co codeposition. Also proposed is the optimization of buffer layers, which buffer substrates during growth and act as optical claddings. Ridge and interferometer components will be modeled using the beam propagation method before prototype isolators are fabricated.

Principal Investigator:

Hu Jiang

Business Contact:

Hua Jiang
President and CEO
Small Business Information at Submission:

Boston Applied Technologies, Inc.
62 Kerry Dr. Mansfield, MA 02048

EIN/Tax ID: 510414999
Number of Employees:
Woman-Owned: No
Minority-Owned: No
HUBZone-Owned: No
Research Institution Information:
University of Minnesota
200 Oak Street S.E.
Minneapolis, MN 55455
Contact: Kevin McKoskey
Contact Phone: (612) 624-5599
RI Type: Nonprofit college or university