Thermal imaging of microwave power GaAs-FET with scanning thermal nanoprobe

Mojtaba Joodaki; Pawel Janus; Teodor Gotszalk; Guenter Kompa; Klaus Edinger; Ivo W. Rangelow

doi:10.1117/12.450989

4 November 2002 Thermal imaging of microwave power GaAs-FET with scanning thermal nanoprobe

Mojtaba Joodaki, Pawel Janus, Teodor Gotszalk, Guenter Kompa, Klaus Edinger, Ivo W. Rangelow

Proceedings Volume 4809, Nanoscale Optics and Applications; (2002) https://doi.org/10.1117/12.450989
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

Application of a new thermal nano-probe based on the changes of electrical resistivity of a nanometer-sized filament with temperature has been presented for the thermal imaging of microwave power active devices. The filament is integrated into an atomic force scanning probe piezoresistive type cantilever. The novel thermal probe has a spatial resolution better than 80 nm and a thermal resolution of the order of 10^-3 K. The measurements have been successfully performed on a 30 fingers GaAs-MESFET with a maximum power dissipation of 2.5 W. The microwave transistor has been implemented in a circuit in such a way to prevent the undesired microwave oscillations. In this case the power dissipation is equal to the dc power input. The near-field measurements have been compared with three-dimensional finite element simulations. A good agreement between simulations and measurements is achieved.

Citation Download Citation

Mojtaba Joodaki, Pawel Janus, Teodor Gotszalk, Guenter Kompa, Klaus Edinger, and Ivo W. Rangelow "Thermal imaging of microwave power GaAs-FET with scanning thermal nanoprobe", Proc. SPIE 4809, Nanoscale Optics and Applications, (4 November 2002); https://doi.org/10.1117/12.450989

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