Publication

Ultra stable tuning fork sensor for low-temperature near-field spectroscopy

Benoît Marie Joseph Deveaud, Jean-Louis Staehli, Andrea Crottini
2002
Journal Articles

Abstract

We report on a distance control system for low-temperature scanning near-field optical microscopy, based on quartz tuning fork as shear force sensor. By means of a particular tuning fork optical fiber configuration, the sensor is electrically dithered by an applied alternate voltage, without any supplementary driving piezo, as done so far. The sensitivity in the approach direction is 0.2 nm, and quality factors up to 2850 have been reached. No electronic components are needed close to the sensor, allowing to employ it in a liquid He environment. The system is extremely compact and allows for several hours of stability at 5 K. (C) 2002 Elsevier Science B.V. All rights reserved.

Official source

https://infoscience.epfl.ch/entities/publication/74e664d9-015d-4cc7-b75d-52433e7d6077

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Benoît Marie Joseph Deveaud, Jean-Louis Staehli, Andrea Crottini
2002
Journal Articles

Abstract

Official source

https://infoscience.epfl.ch/entities/publication/74e664d9-015d-4cc7-b75d-52433e7d6077

About this result

Related concepts (28)

Quartz clock

Quartz clocks and quartz watches are timepieces that use an electronic oscillator regulated by a quartz crystal to keep time. This crystal oscillator creates a signal with very precise frequency, so that quartz clocks and watches are at least an order of magnitude more accurate than mechanical clocks. Generally, some form of digital logic counts the cycles of this signal and provides a numerical time display, usually in units of hours, minutes, and seconds.

Raman spectroscopy

Raman spectroscopy (ˈrɑːmən) (named after Indian physicist C. V. Raman) is a spectroscopic technique typically used to determine vibrational modes of molecules, although rotational and other low-frequency modes of systems may also be observed. Raman spectroscopy is commonly used in chemistry to provide a structural fingerprint by which molecules can be identified. Raman spectroscopy relies upon inelastic scattering of photons, known as Raman scattering.

Tuning fork

A tuning fork is an acoustic resonator in the form of a two-pronged fork with the prongs (tines) formed from a U-shaped bar of elastic metal (usually steel). It resonates at a specific constant pitch when set vibrating by striking it against a surface or with an object, and emits a pure musical tone once the high overtones fade out. A tuning fork's pitch depends on the length and mass of the two prongs. They are traditional sources of standard pitch for tuning musical instruments.

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Ultra stable tuning fork sensor for low-temperature near-field spectroscopy

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