Direct observation of the thermal noise spectrum of a silicon flexure membrane
| Autor: | D. P. Kapasi, T. T-H. Nguyen, R. L. Ward, J. Eichholz, M. H. Iqbal, T. G. McRae, P. A. Altin, D. E. McClelland, B. J. J. Slagmolen |
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| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | Applied Physics Letters. 122:022202 |
| ISSN: | 1077-3118 0003-6951 |
| DOI: | 10.1063/5.0131984 |
| Popis: | We present a direct measurement of the displacement noise spectrum of a macroscopic silicon flexure at room temperature. A cantilever attached to the 100 μm thick flexure holds a mirror which forms part of an optical cavity to enhance the displacement sensitivity to thermal noise. We predict the displacement noise spectrum using a simple model that assumes the dominant source of frequency-dependent loss is thermo-elastic damping and find good agreement with the experimental data. The measurement is consistent with a frequency-independent loss of [Formula: see text] combined with frequency-dependent thermo-elastic damping as the dominant losses. A crossover between the two that occurs well above the flexure resonant frequency allows a broadband measurement of the thermal noise of the silicon flexure. The flexure material, geometry, and measurement band are similar to those of planned future gravitational wave detectors. |
| Databáze: | OpenAIRE |
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