Scattering of microwaves in thin metallic films near the metal - non-metal transition |
|---|
| Jan Obrzut |
- Abstract:
- We present measurements demonstrating significant scattering of microwaves in thin metal films near the metal – non-metal percolation transition. Gold films 3 nm to 12 nm thick were characterized using patterned coplanar waveguides over a frequency range of 100 MHz to 20 GHz. Within the percolation coverage of gold nanoparticles when conductivity > 5 x 103 S/cm and the film properties transition from the dielectric to metallic, the microwave transmittance falls far more rapidly than the classical skin depth model would suggest. We observe a frequency-independent absorption peak of about 50 % in that range, which we believe results from an inhomogeneous localization of electromagnetic field, with no characteristic length scale. Our results demonstrate new techniques to study mechanisms of electromagnetic response of randomly structured metallic networks, and suggests the possibility of using surface-enhanced thin films for microwave applications.
- Keywords:
- microwave propagation; gold nanoparticles; metal-dielectric transition; percolation transition; coplanar waveguides
- Download:
- IMEKO-TC4-2014-442.pdf
- DOI:
- -
- Event details
- IMEKO TC:
- TC4
- Event name:
- TC4 Symposium 2014
- Title:
20th IMEKO TC4 Symposium on Measurements of Electrical Quantities (together with 18th TC4 International Workshop on ADC and DCA Modeling and Testing, IWADC)
"Research on Electrical and Electronic Measurement for the Economic Upturn"- Place:
- Benevento, ITALY
- Time:
- 15 September 2014 - 17 September 2014