Graphite thin film characterization using a simplified resonant near field scanning microwave microscope
G. López-Maldonado, N. Qureshi*, O. V. Kolokoltsev, H. Vargas-Hernández and C. L. Ordóñez-Romero
Centro de Ciencias Aplicadas y Desarrollo Tecnológico (CCADET), * e-mail: naser.qureshi@ccadet.unam.mx
Instituto de Física, Universidad Nacional Autónoma de México, Cd. Universitaria, México D.F., México.
]]>Received 19 February 2013.
Accepted 30 September 2013.
Abstract
We describe a highly simplified design for a coaxial resonant near field scanning microwave microscope operating at 7.4 GHz configured to measure surface resistance and obtain topographic images with micrometer resolution. This design for a resonant probe tip combined with a highly stable mechanical system developed to rapidly tune the resonant frequency enables a simplified and effective approach to implementing near field microwave microscopy. We present images and measurements performed on a non-uniform granular graphite film sample and the surface resistance results agree with data in the literature.
Keywords: Near field scanning microwave microscopy; surface resistance; topographic images; resonant probe; resonant frequency.
Resumen
Presentamos una descripción del diseño de un microscopio de microondas altamente simplificado de exploración por barrido con resonador coaxial que opera en el campo cercano a 7.4 GHz configurado para la medición de la resistencia superficial y la obtención de imágenes topográficas con resolución micrométrica. El diseño de una sonda altamente estable permite la sintonización rápida de la frecuencia de resonancia mediante un sistema mecánico, y esto hace posible una implementación eficiente de la microscopía de microondas de campo cercano. Las imágenes y mediciones presentadas corresponden a una película de grafito granular no uniforme cuya resistencia superficial medida concuerda con los datos reportados en la literatura.
]]> Descriptores: Microscopía de microondas de campo cercano; resistencia superficial; imágenes topográficas; sonda resonante; frecuencia resonante.
PACS: 78.70.Gq.
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Acknowledgement
This work was supported by PAPIIT UNAM, project IN104513. The authors are grateful to Agilent, Mexico, for their generous assistance with microwave measurements.
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