Enhancement of shear-force sensitivity using asymmetric response of tuning forks for near-field scanning optical microscopy

Jang Hoon Yoo, Jae Hoon Lee, Sang Youp Yim, Seung Han Park, Myong Do Ro, Joo Ho Kim, In Sik Park, Kyuman Cho

Research output: Contribution to journalArticle

5 Citations (Scopus)


Resonance characteristics of a tuning fork are investigated to enhance the shear-force detection sensitivity for near-field scanning optical microscopy. In particular, we show that the asymmetric frequency response of a tuning fork can be utilized to increase quality factors and suppress the background feedback signal. The pinning down effect on one side of the main peak can readily elevate vertical sensitivity and stability. A simplified model based on a coupled harmonic oscillator is presented to describe the asymmetric resonance behavior of the tuning fork. We also show improved topographic images of a blue-ray disc and optical images of a chromium pattern on the quartz using the asymmetric resonance.

Original languageEnglish
Pages (from-to)4467-4475
Number of pages9
JournalOptics Express
Issue number19
Publication statusPublished - 2004 Sep


All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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