Publications by Nils Johan Engelsen

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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 ...

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 ...

Extreme stresses can be produced in nanoscale structures, a feature which has been used to realize enhanced materials properties, such as the high mobility of silicon in modern transistors. Here we show how nanoscale stress can be used to realize exception ...

The generation of dissipative Kerr solitons in optical microresonators has provided a route to compact frequency combs of high repetition rate, which have already been employed for optical frequency synthesizers, ultrafast ranging, coherent telecommunicati ...

The generation of dissipative Kerr solitons in optical microresonators allow compact high repetition rate frequency combs. A particularly promising platform is photonic integrated Si3N4 microresonators. Yet to date, soliton formation in Si3N4 microresonato ...

Thermodynamic noise places a fundamental limit on the frequency stability of dielectric optical resonators. Here, we present the characterization of thermorefractive noise in photonic-chip-based silicon-nitride (Si3N4) microresonators and show that thermor ...

We develop a framework of using photonic integrated circuits for free-electron quantum optics applications. We formulate the interaction using a three-dimensional QED quantization procedure, and discuss a few fundamental limitations and specific applicatio ...

At room temperature, mechanical motion driven by the quantum backaction of light has been observed only in pioneering experiments in which an optical restoring force controls the oscillator stiffness1,2. For solid-state mechanical resonators in which oscil ...

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. ...

Nils Johan Engelsen

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Generalized dissipation dilution in strained mechanical resonators

Clamp-Tapering Increases the Quality Factor of Stressed Nanobeams

Elastic strain engineering for ultralow mechanical dissipation

Ultralow-power chip-based soliton microcombs for photonic integration

Ultralow-Power Photonic Chip-Based Soliton Frequency Combs

Thermorefractive noise in silicon-nitride microresonators

Framework of Free-Electron Quantum Optics Using Photonic Integrated Circuits

Room-temperature quantum optomechanics using an ultralow noise cavity

Ultralow Dissipation Mechanical Resonators for Cavity-Free Quantum Control