Results 21 to 30 of about 68,056 (314)
Frontiers in Molecular Biosciences, 2021 We previously introduced the use of DNA molecules for calibration of biophysical force and displacement measurements with optical tweezers. Force and length scale factors can be determined from measurements of DNA stretching.
Youbin Mo +3 more
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Rydberg-Dressed Magneto-optical Trap [PDF]
Physical Review Letters, 2018 We propose and demonstrate the laser cooling and trapping of Rydberg-dressed Sr atoms. By off-resonantly coupling the excited state of a narrow (7 kHz) cooling transition to a high-lying Rydberg state, we transfer Rydberg properties such as enhanced electric polarizability to a stable magneto-optical trap operating at $< 1 K$.
Bounds, A. D. +6 more
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Optical Trapping at Gigapascal Pressures [PDF]
Physical Review Letters, 2013 Diamond anvil cells allow the behavior of materials to be studied at pressures up to hundreds of gigapascals in a small and convenient instrument. However, physical access to the sample is impossible once it is pressurized. We show that optical tweezers can be used to hold and manipulate particles in such a cell, confining micron-sized transparent ...
Bowman, R.W. +4 more
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Blue-Detuned Magneto-Optical Trap [PDF]
Physical Review Letters, 2018 We present the properties and advantages of a new magneto-optical trap (MOT) where blue-detuned light drives `type-II' transitions that have dark ground states. Using $^{87}$Rb, we reach a radiation-pressure-limited density exceeding $10^{11}$cm$^{-3}$ and a temperature below 30$ $K.
Jarvis, KN +4 more
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Molecules, 2021 Continuous rotation of a cholesteric droplet under the heat gradient was observed by Lehmann in 1900. This phenomenon, the so-called Lehmann effect, consists of unidirectional rotation around the heat flux axis.
Jarinee Kiang-ia +5 more
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Orbital Rotation of Trapped Particle in a Transversely Misaligned Dual-Fiber Optical Trap
IEEE Photonics Journal, 2016 We propose and demonstrate a novel optical orbital rotation technique for trapped particle in a transversely misaligned dual-fiber optical trap. The orbital rotation frequency can be controlled by varying the power of two counterpropagating beams.
Guangzong Xiao +4 more
doaj +1 more source
Ramsey Imaging of Optical Traps [PDF]
Physical Review Applied, 2021 Mapping the potential landscape with high spatial resolution is crucial for quantum technologies based on ultracold atoms. Yet, imaging optical dipole traps is challenging because purely optical methods, commonly used to profile laser beams in free space, are not applicable in vacuum.
Gautam Ramola +6 more
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Positioning Accuracy in Holographic Optical Traps
Micromachines, 2021 Spatial light modulators (SLMs) have been widely used to achieve dynamic control of optical traps. Often, holographic optical tweezers have been presumed to provide nanometer or sub-nanometer positioning accuracy.
Frederic Català-Castro +1 more
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Detection Optimization of an Optically Trapped Microparticle in Vacuum with Kalman Filter
Photonics, 2022 The optical trapping of micro-nano particles in a high vacuum has become a popular research platform in various frontier fields of physics because of its excellent isolation from the environment.
Shidong Xu +5 more
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Optimized holographic optical traps
Optics Express, 2005 Holographic optical traps use the forces exerted by computer-generated holograms to trap, move and otherwise transform mesoscopically textured materials. This article introduces methods for optimizing holographic optical traps' efficiency and accuracy, and an optimal statistical approach for characterizing their performance.
Polin, Marco +4 more
openaire +3 more sources