Vibration sensitivity of the scanning near-field optical microscope with a tapered optical fiber probe

In this paper the Rayleigh–Ritz method was used to study the scanning near-field optical microscope (SNOM) with a tapered optical fiber probeʹs flexural and axial sensitivity to vibration. Not only the contact stiffness but also the geometric parameters of the probe can influence the flexural and axial sensitivity to vibration. According to the analysis, the lateral and axial contact stiffness had a significant effect on the sensitivity of vibration of the SNOMʹs probe, each mode had a different level of sensitivity and in the first mode the tapered optical fiber probe was the most acceptive to higher levels of flexural and axial vibration. Generally, when the contact stiffness was lower, the tapered probe was more sensitive to higher levels of both axial and flexural vibration than the uniform probe. However, the situation was reversed when the contact stiffness was larger. Furthermore, the effect that the probeʹs length and its tapered angle had on the SNOMʹs probe axial and flexural vibration were significant and these two conditions should be incorporated into the design of new SNOM probes.