122 citations · 741 across the 23 of their papers we have counts for
6 papers · 1 filter
Exceptional point enhances sensitivity of optomechanical mass sensors
P. Djorwé, Y. Pennec, B. Djafari-Rouhani
We propose an efficient optomechanical mass sensor operating at exceptional points (EPs), non-hermitian degeneracies where eigenvalues of a system and their corresponding eigenvect…
Low-power phonon lasing through position-modulated Kerr-type nonlinearity
P. Djorwe, Y. Pennec, B. Djafari-Rouhani
We demonstrate low-power amplification process in cavity optomechanics (COM). This operation is based on the nonlinear position-modulated self-Kerr interaction. Owing to this nonli…
Frequency locking and controllable chaos through exceptional point in optomechanics
P. Djorwe, Y. Pennec, B. Djafari-Rouhani
We engineer mechanical gain (loss) in system formed by two optomechanical cavities (OMCs), that are mechanically coupled. The gain (loss) is controlled by driving the resonator wit…
Spatio-Temporal Imaging of the Acoustic Field Emitted by a Single Copper Nanowire Copper Nanowires Fabrication
Cyril Jean, Laurent Belliard, Thomas W. Cornelius +5
The monochromatic and geometrically anisotropic acoustic field generated by 400 nm and 120 nm diameter copper nanowires simply dropped on a 10 m silicon membrane is investigated…
Phonons in Slow Motion: Dispersion Relations in Ultra-Thin Si Membranes
John Cuffe, Emigdio Chavez, Andrey Shchepetov +11
We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as \sim 8 nm. We observe a reduction of the phase and group…
Real-Time Imaging of K atoms on Graphite: Interactions and Diffusion
J. Renard, M. B. Lundeberg, J. A. Folk +1
Scanning tunneling microscopy (STM) at liquid helium temperature is used to image potassium adsorbed on graphite at low coverage (~0.02 monolayer). Single atoms appear as protrusio…