Development of a dual-channel scanning microwave/optical microprobe

Aga Jr., Roberto S.; Brookman, Jason; Dizon, Jonathan; Wu, Judy Z.
March 2004
Applied Physics Letters;3/15/2004, Vol. 84 Issue 11, p1979
Academic Journal
A dual-channel scanning microprobe (dual probe) has been developed for simultaneous mapping of microwave and optical properties of a sample. It employs a tunable open-ended coaxial resonator with a tapered and metal-coated fiber optic tip, from which microwave and light can be emitted/collected simultaneously. The microwave channel of this probe, operating at 1.5 GHz, can detect changes in sheet resistance (R[sub x]) above 293 mΩ with a spatial resolution ranging from 5 to 10 μm. The optical channel, on the other hand, has a spatial resolution ∼1 μm. The poorer spatial resolution in the microwave channel was attributed to its lower sensitivity. Imaging of dielectric grid and high-T[sub c] superconducting microwave resonators was carried out at ambient temperature. © 2004 American Institute of Physics.


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