Near-field scanning microwave microscope having a transmission l

Details Near-field scanning microwave microscope having a transmission l Near-field scanning microwave microscope having a transmission l

1997-08-26

1999-05-04

Le, Que T.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250306, G01J 120

Patent

active

059006188

ABSTRACT:
The microscope includes a microwave generator connected to a mismatched transmission line which terminates in a probe with an exposed end. When a sample is brought into close proximity with the exposed end of the probe, the frequencies and quality factors of the standing wave resonances on the transmission line between the source and the probe are modified. The microwave signal reflected from the end of the probe varies as the capacitance between the probe and the sample changes and as the conductivity of the sample changes. Scanning the sample relative to the probe allows generation of an image from the variation of the reflected signal. Alternatively, to image a device with the microscope, a microwave signal is applied to the device, the probe is scanned over the device, and the signal that is picked up is recorded. In a second embodiment, a first lock-in amplifier is used to lock in the microscope at the resonant frequency, and a second lock-in amplifier is used to detect a curvature of the resonance.

REFERENCES:
patent: 5376790 (1994-12-01), Linker et al.
patent: 5397896 (1995-03-01), Weiss et al.
patent: 5489774 (1996-02-01), Akamine et al.
patent: 5559328 (1996-09-01), Weiss et al.
patent: 5619035 (1997-04-01), Weiss et al.
"A tunable microwave frequency alternating current scanning tunneling microscope", Stranick et al, Rev. Sci. Instrum., vol. 65, No. 4, Apr. 1994, pp. 918-921.
"A versatile microwave-frequency-compatible scanning tunneling microscope", Stranick et al, Rev. Sci. Instrum., vol. 64, No. 5, May 1993, pp. 1232-1234.

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