Optimization of Transparent Conducting Oxides for Liquid Crystal Based Optical Phased Arrays

John D. Perkins, Charles W. Teplin, Maikel F.A.M. Van Hest, Chollada Warmsingh, David S. Ginley, Scott R. Harris

Research output: Contribution to conferencePaperpeer-review

2 Scopus Citations


Transparent conducting oxides are used as a contacting layer to liquid crystal (LC) based single wavelength optical phased array (OPA) infrared beam steerers. To investigate TCO optimization for this application, a numerical model based on the Drude (heelectron) theory is used to calculate the optical absorption at 1550 nm for layers with a fixed sheet resistance, Rs, as a function of conducting electron concentration and carrier mobility. For fixed Rs, carrier mobility is found to be the critical parameter. In short, increased mobility allows for reduced carrier concentration and hence less absorption for a given sheet resistance. For Rs = 3000 QISq., as is used in current prototype LC-OPA devices, the use of high conductivity commercial IT0 would require using a very thin, - 1 nm thick, IT0 layer. However, the conventionally worse TCO Zn-Sn-0 has good mobility but with a much lower carrier concentration than IT0 which allows for a more robust layer thickness of 20 nm while still keeping the absorption minimal

Original languageAmerican English
Number of pages7
StatePublished - 2003
Event2003 IEEE Aerospace Conference - Big Sky, MT, United States
Duration: 8 Mar 200315 Mar 2003


Conference2003 IEEE Aerospace Conference
Country/TerritoryUnited States
CityBig Sky, MT

NREL Publication Number

  • NREL/CP-5200-60303


Dive into the research topics of 'Optimization of Transparent Conducting Oxides for Liquid Crystal Based Optical Phased Arrays'. Together they form a unique fingerprint.

Cite this