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Capturing the Genesis of an Active Fischer–Tropsch Synthesis Catalyst with Operando X‐ray Nanospectroscopy

MEMS Nanoreactors, Publications / By

A state‐of‐the‐art operando spectroscopic technique is applied to Co/TiO2 catalysts, which account for nearly half of the world’s transportation fuels produced by Fischer–Tropsch catalysis. This allows determination of, at a spatial resolution of approximately 50 nm, the interdependence of formed hydrocarbon species in the inorganic catalyst. Observed trends show intra‐ and interparticular heterogeneities previously believed not to …

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Probing quantum gravity effects with quantum mechanical oscillator

MEMS Optomechanical Oscillators, Publications / By

We present a new MEMS nanoreactor fully integrated on a single die. It enables atomic-scale imaging of nanostructured materials under the high pressures and temperatures that are typical for many industrial applications (14 bar and 660°C). The reactor can therefore be used to study the behavior of e.g. catalysts in a transmission electron microscope (TEM). …

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Quantum motion of a squeezed mechanical oscillator attained via an optomechanical experiment

MEMS Optomechanical Oscillators, Publications / By

We experimentally investigate a mechanical squeezed state realized in a parametrically modulated membrane resonator embedded in an optical cavity. We demonstrate that a quantum characteristic of the squeezed dynamics can be revealed and quantified even in a moderately warm oscillator, through the analysis of motional sidebands. We provide a theoretical framework for quantitatively interpreting the …

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Visualization of oscillatory behaviour of Pt nanoparticles catalysing CO oxidation

MEMS Nanoreactors, Publications / By

Many catalytic reactions under fixed conditions exhibit oscillatory behaviour. The oscillations are often attributed to dynamic changes in the catalyst surface. So far, however, such relationships were difficult to determine for catalysts consisting of supported nanoparticles. Here, we employ a nanoreactor to study the oscillatory CO oxidation catalysed by Pt nanoparticles using time-resolved high-resolution transmission …

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Quantum Signature of a Squeezed Mechanical Oscillator

MEMS Optomechanical Oscillators, Publications / By

Recent optomechanical experiments have observed nonclassical properties in macroscopic mechanical oscillators. A key indicator of such properties is the asymmetry in the strength of the motional sidebands produced in the probe electromagnetic field, which is originated by the noncommutativity between the oscillator ladder operators. Here we extend the analysis to a squeezed state of an …

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An all-in-one nanoreactor for high-resolution microscopy on nanomaterials at high pressures

MEMS Nanoreactors, Publications / By

We present a new MEMS nanoreactor fully integrated on a single die. It enables atomic-scale imaging of nanostructured materials under the high pressures and temperatures that are typical for many industrial applications (14 bar and 660°C). The reactor can therefore be used to study the behavior of e.g. catalysts in a transmission electron microscope (TEM). …

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Silicon Nitride MOMS Oscillator for Room Temperature Quantum Optomechanics

MEMS Optomechanical Oscillators, Publications / By

Optomechanical SiN nano-oscillators in high-finesse Fabry-Perot cavities can be used to investigate the interaction between mechanical and optical degree of freedom for ultra-sensitive metrology and fundamental quantum mechanical studies. In this paper, we present a nano-oscillator made of a high-stress round-shaped SiN membrane with an integrated on-chip 3-D acoustic shield properly designed to reduce mechanical …

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Calibrated quantum thermometry in cavity optomechanics

MEMS Optomechanical Oscillators, Publications / By

Cavity optomechanics has achieved the major breakthrough of the preparation and observation of macroscopic mechanical oscillators in non-classical states. The development of reliable indicators of the oscillator properties in these conditions is important also for applications to quantum technologies. We compare two procedures to infer the oscillator occupation number, minimizing the necessity of system calibrations. …

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Imaging correlations in heterodyne spectra for quantum displacement sensing

MEMS Optomechanical Oscillators, Publications / By

The extraordinary sensitivity of the output field of an optical cavity to small quantum-scale displacements has led to breakthroughs such as the first detection of gravitational waves and of the motions of quantum ground-state cooled mechanical oscillators. While heterodyne detection of the output optical field of an optomechanical system exhibits asymmetries which provide a key …

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Quantum nondemolition measurement of optical field fluctuations by optomechanical interaction

MEMS Optomechanical Oscillators / By

According to quantum mechanics, if we keep observing a continuous variable we generally disturb its evolution. For a class of observables, however, it is possible to implement a so-called quantum nondemolition measurement: by confining the perturbation to the conjugate variable, the observable is estimated with arbitrary accuracy, or prepared in a well-known state. For instance, …

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