Mohammad J. Bereyhi
École Polytechnique Fédérale de Lausanne
PhysicsNanomechanicsDissipationBeam (structure)TransistorFlexural strengthQ factorMaterials sciencePresentationSilicon nitrideQuality (physics)OptomechanicsOptoelectronicsSiliconCrystalMechanicsStrain engineeringClampingQuantumStress (mechanics)Resonator
14Publications
4H-index
191Citations
Publications 17
Newest
Last. Nils J. EngelsenH-Index: 10
view all 7 authors...
Systems with low mechanical dissipation are extensively used in precision measurements such as gravitational wave detection, atomic force microscopy and quantum control of mechanical oscillators via opto- and electromechanics. The mechanical quality factor (Q of these systems determines the thermomechanical force noise and the thermal decoherence rate of mechanical quantum states. While the dissipation rate is typically set by the bulk acoustic properties of the material, by exploiting dissip...
#1Mohammad J. Bereyhi (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 4
#2Tobias J. Kippenberg (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 94
Sharing the step-by-step procedures necessary to fabricate nanostructures could optimize efforts to achieve reproducible devices.
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In strained mechanical resonators, the concurrence of tensile stress and geometric nonlinearity dramatically reduces dissipation. This phenomenon, dissipation dilution, is employed in mirror suspensions of gravitational wave interferometers and at the nanoscale, where soft-clamping and strain engineering have allowed extremely high quality factors. However, these techniques have so far only been applied in amorphous materials, specifically silicon nitride. Crystalline materials exhibit significa...
2 Citations
#1Mohammad J. Bereyhi (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 4
#2Amirali Arabmoheghi (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 1
Last. Tobias J. Kippenberg (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 94
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#1Mohammad J. Bereyhi (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 4
#2Amirali Arabmoheghi (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 1
Last. Tobias J. Kippenberg (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 94
view all 0 authors...
We report the design fabrication and characterization of a monolithic nano-optomechanical transducer comprised of high stress silicon nitride (Si3N4). Our system features a one dimensional Fabry-Perot photonic crystal cavity (Q ≈ 105) integrated with a high-Q (Q ≈106) nanobeam resonator with optomechanical cooperativity of C0 = 23.
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Structural hierarchy is found in myriad biological systems and has improved man-made structures ranging from the Eiffel tower to optical cavities. Hierarchical metamaterials utilize structure at multiple size scales to realize new and highly desirable properties which can be strikingly different from those of the constituent materials. In mechanical resonators whose rigidity is provided by static tension, structural hierarchy can reduce the dissipation of the fundamental mode to ultralow levels ...
7 Citations
#1Dalziel J. WilsonH-Index: 18
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#1Nils J. EngelsenH-Index: 10
#2Amir H. GhadimiH-Index: 9
Last. Tobias J. KippenbergH-Index: 94
view all 7 authors...
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#1Sergey A. FedorovH-Index: 7
#2Nils J. EngelsenH-Index: 10
Last. Tobias J. KippenbergH-Index: 94
view all 7 authors...
Mechanical resonators with high quality factors are of relevance in precision experiments, ranging from gravitational wave detection and force sensing to quantum optomechanics. Beams and membranes are well known to exhibit flexural modes with enhanced quality factors when subjected to tensile stress. The mechanism for this enhancement has been a subject of debate, but is typically attributed to elastic energy being "diluted" by a lossless potential. Here we clarify the origin of the lossless pot...
24 CitationsSource
#1Mohammad J. Bereyhi (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 4
#2Alberto Beccari (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 4
Last. Tobias J. Kippenberg (EPFL: École Polytechnique Fédérale de Lausanne)H-Index: 94
view all 8 authors...
Stressed nanomechanical resonators are known to have exceptionally high quality factors (Q) due to the dilution of intrinsic dissipation by stress. Typically, the amount of dissipation dilution and thus the resonator Q is limited by the high mode curvature region near the clamps. Here we study the effect of clamp geometry on the Q of nanobeams made of high-stress Si3N4. We find that tapering the beam near the clamps, thus locally increasing the stress, leads to an increased Q of MHz-frequency lo...
16 CitationsSource