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Abstract
Optomechanical crystal cavities (OMC) have rich perspectives for detecting and indirectly analysing biological particles, such as proteins, bacteria and viruses. In this work we demonstrate the working principle of OMCs operating under ambient conditions as a sensor of submicrometer particles by optically monitoring the frequency shift of thermally activated mechanical modes. The resonator has been specifically designed so that the cavity region supports a particular family of low modal-volume mechanical modes, commonly known as -pinch modes-. These involve the oscillation of only a couple of adjacent cavity cells that are relatively insensitive to perturbations in other parts of the resonator. The eigenfrequency of these modes decreases as the deformation is localized closer to the centre of the resonator. Thus, by identifying specific modes that undergo a frequency shift that amply exceeds the mechanical linewidth, it is possible to infer if there are particles deposited on the resonator, how many are there and their approximate position within the cavity region. OMCs have rich perspectives for detecting and indirectly analysing biological particles, such as proteins, viruses and bacteria.
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Details
1 Universitat de Barcelona, MIND-IN2UB, Departament d’Enginyeria Electrònica i Biomèdica, Facultat de Física, Barcelona, Spain (GRID:grid.5841.8) (ISNI:0000 0004 1937 0247); Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Barcelona, Spain (GRID:grid.424584.b)
2 Max Planck Institute for Polymer Research, Mainz, Germany (GRID:grid.419547.a) (ISNI:0000 0001 1010 1663)
3 Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Barcelona, Spain (GRID:grid.424584.b)
4 Max Planck Institute for Polymer Research, Mainz, Germany (GRID:grid.419547.a) (ISNI:0000 0001 1010 1663); Adam Mickiewicz University, Faculty of Physics, Poznan, Poland (GRID:grid.5633.3) (ISNI:0000 0001 2097 3545)
5 Universidad de La Laguna, Depto. Física, San Cristóbal de La Laguna, Spain (GRID:grid.10041.34) (ISNI:0000000121060879); Universidad de La Laguna, Instituto Universitario de Materiales y Nanotecnología, Santa Cruz de Tenerife, Spain (GRID:grid.10041.34) (ISNI:0000000121060879)
6 Catalan Institute of Nanoscience and Nanotechnology (ICN2), CSIC and BIST, Barcelona, Spain (GRID:grid.424584.b); Catalan Institute for Research and Advances Studies ICREA, Barcelona, Spain (GRID:grid.425902.8) (ISNI:0000 0000 9601 989X)