Publications by Sergey Fedorov

Hierarchical tensile structures with ultralow mechanical dissipation

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

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

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

Strained crystalline nanomechanical resonators with quality factors above 10 billion

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

In strained mechanical resonators, the concurrence of tensile stress and geometric nonlinearity dramatically reduces dissipation. This phenomenon, called dissipation dilution, is employed in mirror suspensions of gravitational-wave interferometers and at t ...

NATURE PORTFOLIO2022

Mechanical resonators with high dissipation dilution in precision and quantum measurements

Sergey Fedorov

Position measurements of mechanical oscillators underpin experiments spanning from applied nanoscale sensing to endeavors aiming to resolve open fundamental problems of modern physics. Sufficiently precise position measurements are also used for engineerin ...

EPFL2021

Fractal-like Mechanical Resonators with a Soft-Clamped Fundamental Mode

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

Self-similar structures occur naturally and have been employed to engineer exotic physical properties. We show that acoustic modes of a fractal-like system of tensioned strings can display increased mechanical quality factors due to the enhancement of diss ...

AMER PHYSICAL SOC2020

Thermal intermodulation noise in cavity-based measurements

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

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

Generalized dissipation dilution in strained mechanical resonators

Tobias Kippenberg, Dalziel Joseph Wilson, Nils Johan Engelsen, Sergey Fedorov, Ryan Daniel Schilling, Amir Hossein Ghadimi

Mechanical resonators with high quality factors are widely used 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 quali ...

AMER PHYSICAL SOC2019

Quantum-Limited Measurements Using an Optical Cavity with Modulated Intrinsic Loss

Alexander Tagantsev, Sergey Fedorov

We analyze a cavity optomechanical setup, in which the position of an oscillator modulates the internal optical loss. We show that, in contrast to systems with a fixed internal loss, in such a setup, quantum-limited position measurements can be performed a ...

AMER PHYSICAL SOC2019

ULTRASTABLE LASER SYSTEM FOR SPECTROSCOPY OF THE 1.14 mu m INNER-SHELL CLOCK TRANSITION IN Tm AND ITS ABSOLUTE FREQUENCY MEASUREMENT

Sergey Fedorov

We characterize a 1.14 mu m ultrastable semiconductor laser system for precision spectroscopy of Tm inner-shell clock transition using a frequency comb. We stabilize both the repetition and the carrier-envelope offset frequencies of a commercial Ti : sapph ...

SPRINGER2019

Ultralow Dissipation Mechanical Resonators for Quantum Optomechanics

Tobias Kippenberg, Alberto Beccari, Dalziel Joseph Wilson, Sergey Fedorov, Nils Johan Engelsen, Ryan Daniel Schilling, Amir Hossein Ghadimi

We demonstrate dissipation dilution engineering techniques for ultralow dissipation mechanical resonators. The Si3N4 nanobeams show quality factors (Q) as high as 800 million and Q x f exceeding 10(15) Hz-both records at room temperature. (C) 2019 The Auth ...

IEEE2019