A new method of Q factor optimization by introducing two nodal wedges in a tuning-fork/fiber probe distance sensor

作者：Park Kyoung Duck^*; Kim Dae Chan; O Beom Hoan; Park Se Geun; Lee El Hang; Lee Seung Gol

来源：Review of Scientific Instruments, 2010, 81(9): 093702.

DOI：10.1063/1.3480557

• near-field scanning optical microscopy
• Q-factor
• vibrational modes
• vibrations

We report on a new method of achieving and optimizing a high Q factor in a near-field scanning optical microscope (NSOM) by introducing two nodal wedges to a tuning-fork/fiber probe distance sensor and by selecting a vibrational mode of the dithering sensor. The effect of the nodal wedges on the dynamical properties of the sensor is theoretically analyzed and experimentally confirmed. The optimization achieved by the proposed method is understood from the vibration isolation and the subsequent formation of a local vibration cavity. The optimal condition is found to be less susceptible to the variation of the fiber tip length. This method allows effective NSOM measurement of samples placed even in aqueous solution.

• 出版日期2010-9