David Grass
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View article: Noninvasive identification of carbon-based black pigments with pump-probe microscopy
Noninvasive identification of carbon-based black pigments with pump-probe microscopy Open
Carbon-based black pigments, a widely used class of pigments, are difficult to differentiate with the noninvasive techniques currently used in cultural heritage science. We use pump-probe microscopy, coupled with a support vector machine, …
View article: Non-destructive three-dimensional imaging of artificially degraded CdS paints by pump-probe microscopy
Non-destructive three-dimensional imaging of artificially degraded CdS paints by pump-probe microscopy Open
Cadmium sulfide (CdS) pigments have degraded in several well-known artworks, but the influence of pigment properties and environmental conditions on the degradation process have yet to be fully understood. Traditional non-destructive analy…
View article: Noninvasive identification of carbon-based black pigments with pump-probe microscopy
Noninvasive identification of carbon-based black pigments with pump-probe microscopy Open
Carbon-based black pigments, a widely used class of pigments, are difficult to differentiate with the noninvasive techniques currently used in cultural heritage science. We utilize pump-probe microscopy to distinguish four common carbon-ba…
View article: Non-destructive Three-dimensional Imaging of Artificially Degraded CdS Paints by Pump-probe Microscopy
Non-destructive Three-dimensional Imaging of Artificially Degraded CdS Paints by Pump-probe Microscopy Open
Cadmium sulfide (CdS) pigments have degraded in several well-known paintings, but the mechanisms of degradation have yet to be fully understood. Traditional non-destructive analysis techniques primarily focus on macroscopic degradation, wh…
View article: Contrast mechanisms in pump-probe microscopy of melanin
Contrast mechanisms in pump-probe microscopy of melanin Open
Pump-probe microscopy of melanin in tumors has been proposed to improve diagnosis of malignant melanoma, based on the hypothesis that aggressive cancers disaggregate melanin structure. However, measured signals of melanin are complex super…
View article: Nonequilibrium Control of Thermal and Mechanical Changes in a Levitated System
Nonequilibrium Control of Thermal and Mechanical Changes in a Levitated System Open
Fluctuation theorems are fundamental extensions of the second law of thermodynamics for small nonequilibrium systems. While work and heat are equally important forms of energy exchange, fluctuation relations have not been experimentally as…
View article: Beyond intensity modulation: new approaches to pump-probe microscopy
Beyond intensity modulation: new approaches to pump-probe microscopy Open
Pump-probe microscopy is an emerging nonlinear imaging technique based on high repetition rate lasers and fast intensity modulation. Here, we present new methods for pump-probe microscopy that keep the beam intensity constant and instead m…
View article: Low-cost measurement of face mask efficacy for filtering expelled droplets during speech
Low-cost measurement of face mask efficacy for filtering expelled droplets during speech Open
A simple method was developed for evaluating the efficacy of face masks to reduce respiratory droplet emission during speaking.
View article: Video data from: Low-cost measurement of facemask efficacy for filtering expelled droplets during speech
Video data from: Low-cost measurement of facemask efficacy for filtering expelled droplets during speech Open
Mandates for mask use in public during the recent COVID-19 pandemic, worsened by global shortage of commercial supplies, have led to widespread use of homemade masks and mask alternatives. It is assumed that wearing such masks reduces the …
View article: Low-cost measurement of facemask efficacy for filtering expelled droplets during speech
Low-cost measurement of facemask efficacy for filtering expelled droplets during speech Open
Mandates for mask use in public during the recent COVID-19 pandemic, worsened by global shortage of commercial supplies, have led to widespread use of homemade masks and mask alternatives. It is assumed that wearing such masks reduces the …
View article: Video data from: Low-cost measurement of facemask efficacy for filtering expelled droplets during speech
Video data from: Low-cost measurement of facemask efficacy for filtering expelled droplets during speech Open
Mandates for mask use in public during the recent COVID-19 pandemic, worsened by global shortage of commercial supplies, have led to widespread use of homemade masks and mask alternatives. It is assumed that wearing such masks reduces the …
View article: Cooling of a levitated nanoparticle to the motional quantum ground state
Cooling of a levitated nanoparticle to the motional quantum ground state Open
A nanoparticle trapped and cooled Cooling massive particles to the quantum ground state allows fundamental tests of quantum mechanics to be made; it would provide an experimental probe of the boundary between the classical and quantum worl…
View article: Motional Quantum Ground State of a Levitated Nanoparticle from Room Temperature
Motional Quantum Ground State of a Levitated Nanoparticle from Room Temperature Open
We report quantum ground state cooling of a levitated nanoparticle in a room temperature environment. Using coherent scattering into an optical cavity we cool the center of mass motion of a $143$ nm diameter silica particle by more than $7…
View article: Cavity Cooling of a Levitated Nanosphere by Coherent Scattering
Cavity Cooling of a Levitated Nanosphere by Coherent Scattering Open
We report three-dimensional (3D) cooling of a levitated nanoparticle inside an optical cavity. The cooling mechanism is provided by cavity-enhanced coherent scattering off an optical tweezer. The observed 3D dynamics and cooling rates are …
View article: Nanophotonic near-field levitated optomechanics
Nanophotonic near-field levitated optomechanics Open
Optical control of trapped dielectric objects provides a remarkably simple, yet versatile platform for studying a plethora of intriguing problems in single molecule biophysics, thermodynamics, sensing or fundamental physics. Realizing full…
View article: Of mice and <scp>CRISPR</scp>
Of mice and <span>CRISPR</span> Open
The usefulness of a specific technology often hits a ceiling based on technical limitations. Then, a single advance, frequently orthogonal to the core methodology, dramatically expands the utility of this technology. The effectiveness of e…
View article: Optical trapping and control of nanoparticles inside evacuated hollow core photonic crystal fibers
Optical trapping and control of nanoparticles inside evacuated hollow core photonic crystal fibers Open
We demonstrate an optical conveyor belt for levitated nano-particles over several centimeters inside both air-filled and evacuated hollow-core photonic crystal fibers (HCPCF). Detection of the transmitted light field allows three-dimension…