Publications de Amirali Arabmoheghi

Motional Sideband Asymmetry of a Solid-State Mechanical Resonator at Room Temperature

Tobias Kippenberg, Nils Johan Engelsen, Alberto Beccari, Amirali Arabmoheghi, Guanhao Huang

The motional sideband asymmetry of a mechanical oscillator interacting with a laser field can be observed when approaching the quantum ground state, where the zero-point energy of the mechanical oscillator becomes a sizable contribution to its motion. In t ...

2025

Fiber-Coupled Absorption-based Quantum Sensing with Nitrogen Vacancy Ensembles in a Suspended Diamond Photonic Cavity

Christophe Marcel Georges Galland, Amirali Arabmoheghi

Low photon extraction efficiency limits the optical spin readout fidelity in emerging quantum sensing technologies in diamond. Here, we propose and fabricate integrated diamond nanoprobes based on cavity-enhanced IR absorption of embedded Nitrogen Vacancy ...

IEEE Computer Society2024

Ultralow Dissipation Mechanical Resonators for Cavity-Free Quantum Control

Tobias Kippenberg, Nils Johan Engelsen, Alberto Beccari, Amirali Arabmoheghi, Guanhao Huang

We fabricate nanomechanical resonators with Q > 109 at room temperature and show efficient optical readout of their motion. With an improved interferometer, these devices can be cooled close to the ground state without a cavity. ...

Optical Society of America2023

Hierarchical tensile structures with ultralow mechanical dissipation

Tobias Kippenberg, Sergey Fedorov, Nils Johan Engelsen, Alberto Beccari, Amirali Arabmoheghi

Structural hierarchy is found in myriad biological systems and has improved man-made structures ranging from the Eiffel tower to optical cavities. In mechanical resonators whose rigidity is provided by static tension, structural hierarchy can reduce the di ...

Nature Portfolio2022

Perimeter Modes of Nanomechanical Resonators Exhibit Quality Factors Exceeding 10(9) at Room Temperature

Tobias Kippenberg, Sergey Fedorov, Nils Johan Engelsen, Alberto Beccari, Amirali Arabmoheghi, Guanhao Huang

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 optomechanics and electromechanics. The mechanical quali ...

American Physical Society2022

A High Cooperativity Silicon Nitride Optomechanical Transducer

Tobias Kippenberg, Nils Johan Engelsen, Amirali Arabmoheghi

IEEE2021

A high-cooperativity, nano-optomechanical system comprised of high stress Si3N4

Tobias Kippenberg, Nils Johan Engelsen, Amirali Arabmoheghi

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 approximate to 10(5)) integr ...

IEEE2021

Thermal intermodulation noise in cavity-based measurements

Tobias Kippenberg, Dalziel Joseph Wilson, Sergey Fedorov, Alberto Beccari, Amirali Arabmoheghi

Thermal frequency fluctuations in optical cavities limit the sensitivity of precision experiments ranging from gravitational wave observatories to optical atomic clocks. Conventional modeling of these noises assumes a linear response of the optical field t ...

2020