146 citations · 390 across the 11 of their papers we have counts for
11 papers
Optomechanical vector sensing of new forces at 6 micron separation
Gautam Venugopalan, Clarke A. Hardy, Kenneth Kohn +10
The search for new gravity-like interactions at the sub-millimeter scale is a compelling area of research, with important implications for the understanding of classical gravity an…
Librational Feedback Cooling
Charles P. Blakemore, Denzal Martin, Alexander Fieguth +4
Librational motion, whereby a rigid body undergoes angular oscillation around a preferred direction, can be observed in optically trapped, silica microspheres. We demonstrate the c…
A background-free optically levitated charge sensor
Nadav Priel, Alexander Fieguth, Charles P. Blakemore +5
Optically levitated macroscopic objects are a powerful tool in the field of force sensing, owing to high sensitivity, absolute force calibration, environmental isolation and the ad…
Search for non-Newtonian interactions at micrometer scale with a levitated test mass
Charles P. Blakemore, Alexander Fieguth, Akio Kawasaki +5
We report on a search for non-Newtonian forces that couple to mass, with a characteristic scale of m, using an optically levitated microsphere as a precision force sens…
High sensitivity, levitated microsphere apparatus for short-distance force measurements
Akio Kawasaki, Alexander Fieguth, Nadav Priel +3
A high sensitivity force sensor based on dielectric microspheres in vacuum, optically trapped by a single, upward-propagating laser beam, is described. Off-axis parabolic mirrors a…
Absolute pressure and gas species identification with an optically levitated rotor
Charles P. Blakemore, Denzal Martin, Alexander Fieguth +4
The authors describe a novel variety of spinning-rotor vacuum gauge in which the rotor is a m-diameter silica microsphere, optically levitated. A rotating elec…
Precision Mass and Density Measurement of Individual Optically Levitated Microspheres
Charles P. Blakemore, Alexander D. Rider, Sandip Roy +4
We report an mass measurement of approximately-m-diameter, optically levitated microspheres with an electrostatic co-levitation technique. The mas…
Electrically Driven, Optically Levitated Microscopic Rotors
Alexander D. Rider, Charles P. Blakemore, Akio Kawasaki +3
We report on the electrically driven rotation of m-radius, optically levitated dielectric microspheres. Electric fields are used to apply torques to a microsphere's permanen…
Three-dimensional force-field microscopy with optically levitated microspheres
Charles P. Blakemore, Alexander D. Rider, Sandip Roy +3
We report on the use of 4.7-m-diameter, optically levitated, charged microspheres to image the three-dimensional force field produced by charge distributions on an Au-coated, mi…
Single-beam dielectric-microsphere trapping with optical heterodyne detection
Alexander D. Rider, Charles P. Blakemore, Giorgio Gratta +1
A technique to levitate and measure the three-dimensional position of micrometer-sized dielectric spheres with heterodyne detection is presented. The two radial degrees of freedom…
Search for Screened Interactions Associated with Dark Energy Below the 100 Length Scale
Alexander D. Rider, David C. Moore, Charles P. Blakemore +3
We present the results of a search for unknown interactions that couple to mass between an optically levitated microsphere and a gold-coated silicon cantilever. The scale and geome…