George Winstone
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View article: Simulating the Galactic population of axion clouds around stellar-origin black holes: Gravitational wave signals in the 10-100 kHz band
Simulating the Galactic population of axion clouds around stellar-origin black holes: Gravitational wave signals in the 10-100 kHz band Open
Ultralight scalar fields can experience runaway `superradiant' amplification near spinning black holes, resulting in a macroscopic `axion cloud' which slowly dissipates via continuous monochromatic gravitational waves. For a particular ran…
View article: Optimal displacement detection of arbitrarily-shaped levitated dielectric objects using optical radiation
Optimal displacement detection of arbitrarily-shaped levitated dielectric objects using optical radiation Open
Optically-levitated dielectric objects are promising for precision force, acceleration, torque, and rotation sensing due to their extreme environmental decoupling. While many levitated opto-mechanics experiments employ spherical objects, f…
View article: Optomechanics of optically-levitated particles: A tutorial and perspective
Optomechanics of optically-levitated particles: A tutorial and perspective Open
Optomechanics, the study of the mechanical interaction of light with matter, has proven to be a fruitful area of research that has yielded many notable achievements, including the direct detection of gravitational waves in kilometer-scale …
View article: An apparatus for in-vacuum loading of nanoparticles into an optical trap
An apparatus for in-vacuum loading of nanoparticles into an optical trap Open
We describe the design, construction, and operation of an apparatus utilizing a piezoelectric transducer for in-vacuum loading of nanoparticles into an optical trap for use in levitated optomechanics experiments. In contrast to commonly us…
View article: Optical Trapping of High-Aspect-Ratio NaYF Hexagonal Prisms for kHz-MHz Gravitational Wave Detectors
Optical Trapping of High-Aspect-Ratio NaYF Hexagonal Prisms for kHz-MHz Gravitational Wave Detectors Open
We present experimental results on optical trapping of Yb-doped $β-$NaYF sub-wavelength-thickness high-aspect-ratio hexagonal prisms with a micron-scale radius. The prisms are trapped in vacuum using an optical standing wave, oriented with…
View article: Searching for new physics with a levitated-sensor-based gravitational-wave detector
Searching for new physics with a levitated-sensor-based gravitational-wave detector Open
The Levitated Sensor Detector (LSD) is a compact resonant gravitational-wave (GW) detector based on optically trapped dielectric particles that is under construction. The LSD sensitivity has more favorable frequency scaling at high frequen…
View article: Static force characterization with Fano anti-resonance in levitated optomechanics
Static force characterization with Fano anti-resonance in levitated optomechanics Open
We demonstrate a classical analogy to the Fano anti-resonance in levitated optomechanics by applying a DC electric field. Specifically, we experimentally tune the Fano parameter by applying a DC voltage from 0 kV to 10 kV on a nearby charg…
View article: Direct measurement of the electrostatic image force of a levitated charged nanoparticle close to a surface
Direct measurement of the electrostatic image force of a levitated charged nanoparticle close to a surface Open
We report on optical levitation experiments to probe the interaction of a nanoparticle with a surface in vacuum. The observed interaction-induced effect is a controllable anharmonicity of the particle trapping potential. We reconstruct the…
View article: Experimental demonstration of Fano anti-resonance in levitated optomechanics
Experimental demonstration of Fano anti-resonance in levitated optomechanics Open
We demonstrate a classical analogy to the Fano anti-resonance in levitated optomechanics by applying a DC electric field. Specifically, we experimentally tune the Fano parameter by applying a DC voltage from 0~kV to 10~kV on a nearby charg…