Temperature and non-linear response of cantilever-type mechanical oscillators used in atomic force microscopes with interferometric detection
- Institut für Angewandte Physik, Universität Hamburg, Jungiusstrasse 11, 20355 Hamburg (Germany)
- I. Institut für Theoretische Physik, Universität Hamburg, Jungiusstrae 9, 20355 Hamburg (Germany)
The sensitivity of atomic force microscopes is fundamentally limited by the cantilever temperature, which can be, in principle, determined by measuring its thermal spectrum and applying the equipartition theorem. However, the mechanical response can be affected by the light field inside the cavity of a Fabry-Perot interferometer due to light absorption, radiation pressure, photothermal forces, and laser noise. By evaluating the optomechanical Hamiltonian, we are able to explain the peculiar distance dependence of the mechanical quality factor as well as the appearance of thermal spectra with symmetrical Lorentzian as well as asymmetrical Fano line shapes. Our results can be applied to any type of mechanical oscillator in an interferometer-based detection system.
- OSTI ID:
- 22398780
- Journal Information:
- Applied Physics Letters, Vol. 106, Issue 12; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); ISSN 0003-6951
- Country of Publication:
- United States
- Language:
- English
Similar Records
Controlling the opto-mechanics of a cantilever in an interferometer via cavity loss
Topography imaging with a heated atomic force microscope cantilever in tapping mode