Distance control for a near-field scanning microwave microscope in liquid using a quartz tuning fork

Songhui Kim, Hyunjun Yoo, Kiejin Lee, Barry Friedman, Mariafrancis A. Gaspar, Rastislav Levicky

Research output: Contribution to journalArticlepeer-review

Abstract

We demonstrate a scanning near-field microwave microscope (NSMM) in the liquid environment using a tuning fork shear-force feedback method to control the distance between tip and sample. Only the probe tip for the NSMM is immersed in water. The dry part of the probe is attached to one prong of a quartz tuning fork and directly coupled to a high-quality dielectric resonator at an operating frequency f=4.5-5.5 GHz. This distance control method is independent of the local microwave characteristics. The amplitude of the tuning fork was used as a set point of the distance control parameter in the liquid. To demonstrate the distance regulation system, we present the NSMM images of a copper film in air and liquid without and with readjustment of the distance set point, as well as an image of a DNA film in buffer solution. Imaging under buffer environments is of particular interest for future studies of biomolecular association reactions on solid supports.

Original languageEnglish (US)
Article number153506
Pages (from-to)1-3
Number of pages3
JournalApplied Physics Letters
Volume86
Issue number15
DOIs
StatePublished - 2005

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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