Abstract
Cooling the vibration amplitude of a microcantilever as low as possible is important to improve the sensitivity and resolutions of various types of scanning type microscopes and sensors making use of it. When the vibration amplitude is controlled to be smaller using a feed back control system, it is known that the obtainable minimum amplitude of the vibration is limited by the floor noise level of the detection system. In this study, we demonstrated that the amplitude of the thermal vibration of a microcantilever was suppressed to be about 0.15 pmHz−1/2, which is the same value with the floor noise level, without the assistance of external cryogenic cooling. We think that one of the reason why we could reach the smaller amplitude at room temperature is due to stiffer spring constant of the lever, which leads to higher natural frequency and consequently lower floor noise level. The other reason is considered to be due to the increase in the laser power for the diagnostics, which lead to the decrease in the signal to noise ratio determined by the optical shot noise.
Highlights
Cooling the vibration amplitude of a microcantilever as low as possible is important to improve the sensitivity and resolutions of various types of scanning type microscopes and sensors making use of it
The study in this paper belongs to the latter regime. we demonstrated that the amplitude of the power spectrum density of the thermal vibration of a microcantilever was suppressed to be about 0.02 pm2/Hz, which is the same value with the floor noise level, without the assistance of external cryogenic cooling
The power spectral density for the vibration amplitude is about 0.02 pm[2] Hz−1, which is two orders of magnitude smaller than that of the previous work[15], even though this experiment was performed at room temperature and the previous work was done at 4.2 K
Summary
Cooling the vibration amplitude of a microcantilever as low as possible is important to improve the sensitivity and resolutions of various types of scanning type microscopes and sensors making use of it. The other is the regime represented by a “microcantilever” with relatively low natural frequencies (several kHz–several tens of kHz) and classical methods of detection, such as an optical interferometry[11,12,13,14,15,16,17,18,19,20,21] In this case, the minimum for the quantum number obtained was large at 2.1 × 104, which was achieved aided by cryogenic cooling of the resonator to several Kelvins[15]. The minimum for the quantum number obtained was large at 2.1 × 104, which was achieved aided by cryogenic cooling of the resonator to several Kelvins[15] The objective of the former regime was mainly the physical demonstration of the existence of the quantum zero-energy point and its application in studies on basic physical phenomena. The concern was mainly the applications of the silicon micro-cantilever to the more sensor detecting technologies[18,19,20,21]
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