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Proceedings Paper

Theoretical analysis of two nodal-wedges method to enhance the vibration behavior of NSOM probe with its tip being immersed partially in liquid
Author(s): Wonjun Lee; Dae-Chan Kim; Beom-Hoan O; Se-Geun Park; El-Hang Lee; Seung Gol Lee
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Paper Abstract

In this study, a tuning fork-fiber probe system for a near-field scanning optical microscope (NSOM probe), whose fiber tip was partially dipped into liquid and vibration behavior was mechanically controlled with two nodal-wedges method, was modeled by bending vibration equations, and its resonant characteristics were numerically investigated by solving the system of equations. For the two nodal-wedges method, pin point and knife-edge balance point were newly introduced into a typical NSOM probe, and their contact positions were adjusted along the axis of the fiber probe in order to invoke versatile vibrational modes. From the numerical analysis, it was shown that the resonant frequency and the Q value of the NSOM probe were changed periodically with shifting the contact position of either the knife-edge balance point or the pin point, and that the Q value of the NSOM probe could be controlled by adjusting their contact positions as in air. Additionally, it was found that the Q value was gradually decreased with increasing the dipping depth of the fiber tip and that the Q value could be greatly enhanced at the optimal contact positions of two nodal points.

Paper Details

Date Published: 8 May 2012
PDF: 8 pages
Proc. SPIE 8427, Biophotonics: Photonic Solutions for Better Health Care III, 84272Z (8 May 2012); doi: 10.1117/12.922174
Show Author Affiliations
Wonjun Lee, Inha Univ. (Korea, Republic of)
Dae-Chan Kim, Inha Univ. (Korea, Republic of)
Beom-Hoan O, Inha Univ. (Korea, Republic of)
Se-Geun Park, Inha Univ. (Korea, Republic of)
El-Hang Lee, Inha Univ. (Korea, Republic of)
Seung Gol Lee, Inha Univ. (Korea, Republic of)

Published in SPIE Proceedings Vol. 8427:
Biophotonics: Photonic Solutions for Better Health Care III
Jürgen Popp; Wolfgang Drexler; Valery V. Tuchin; Dennis L. Matthews, Editor(s)

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