The Experts below are selected from a list of 2394 Experts worldwide ranked by ideXlab platform
David G Grier - One of the best experts on this subject based on the ideXlab platform.
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colloidal transport through Optical Tweezer arrays
2007Co-Authors: Yael Roichman, Victor Wong, David G GrierAbstract:Viscously damped particles driven past an evenly spaced array of potential energy wells or barriers may become kinetically locked in to the array, or else may escape from the array. The transition between locked-in and free-running states has been predicted to depend sensitively on the ratio between the particles' size and the separation between wells. This prediction is confirmed by measurements on monodisperse colloidal spheres driven through arrays of holographic Optical traps.
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modulated Optical vortices
2003Co-Authors: Jennifer E Curtis, David G GrierAbstract:Single-beam Optical gradient force traps created by focusing helical modes of light are known as Optical vortices. Modulating the helical pitch of such a mode's wave front yields a new class of Optical traps whose dynamically reconfigurable intensity distributions provide new opportunities for controlling motion in mesoscopic systems. An implementation of modulated Optical vortices based on the dynamic holographic Optical Tweezer technique is described.
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nanofabrication with holographic Optical Tweezers
2002Co-Authors: Pamela T Korda, Eric R. Dufresne, Gabriel C Spalding, David G GrierAbstract:We describe Optical trapping techniques based on holographic Optical Tweezer arrays useful for assembling colloidal particles into arbitrary arrangements for photonics, optoelectronic, and sensor applications.
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computer generated holographic Optical Tweezer arrays
2000Co-Authors: Eric R. Dufresne, Gabriel C Spalding, Matthew T Dearing, S A Sheets, David G GrierAbstract:Holographic techniques significantly extend the capabilities of laser tweezing, making possible extended trapping patterns for manipulating large numbers of particles and volumes of soft matter. We describe practical methods for creating arbitrary configurations of Optical Tweezers using computer-generated diffractive Optical elements. While the discussion focuses on ways to create planar arrays of identical Tweezers, the approach can be generalized to three-dimensional arrangements of heterogeneous Tweezers and extended trapping patterns.
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Optical Tweezer arrays and Optical substrates created with diffractive optics
1998Co-Authors: Eric R. Dufresne, David G GrierAbstract:We describe a simple method for creating multiple Optical Tweezers from a single laser beam using diffractive Optical elements. As a demonstration of this technique, we have implemented a 434 square array of Optical Tweezers—the hexadeca Tweezer. Not only will diffractively generated Optical Tweezers facilitate many new experiments in pure and applied physics, but they also will be useful for fabricating nanocomposite materials and devices, including photonic bandgap materials and Optical circuit elements
Kenneth Wang - One of the best experts on this subject based on the ideXlab platform.
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assembly of a rovibrational ground state molecule in an Optical Tweezer
2021Co-Authors: J Zhang, William Cairncross, Kenneth Wang, Lewis R B PicardAbstract:We demonstrate the coherent creation of a single NaCs molecule in its rotational, vibrational, and electronic (rovibronic) ground state in an Optical Tweezer. Starting with a weakly bound Feshbach molecule, we locate a two-photon transition via the |c^{3}Σ_{1},v^{'}=26⟩ excited state and drive coherent Rabi oscillations between the Feshbach state and a single hyperfine level of the NaCs rovibronic ground state |X^{1}Σ,v^{''}=0,N^{''}=0⟩ with a binding energy of D_{0}=h×147044.63(11) GHz. We measure a lifetime of 3.4±1.6 s for the rovibronic ground state molecule, which possesses a large molecule-frame dipole moment of 4.6D and occupies predominantly the motional ground state. These long-lived, fully quantum-state-controlled individual dipolar molecules provide a key resource for molecule-based quantum simulation and information processing.
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reduction of laser intensity noise over 1 mhz band for single atom trapping
2020Co-Authors: Yu Wang, Kenneth Wang, Yenwei Lin, Eliot F Fenton, J D HoodAbstract:We reduce the intensity noise of laser light by using an electro-optic modulator and acousto-optic modulator in series. The electro-optic modulator reduces noise at high frequency (10 kHz to 1 MHz), while the acousto-optic modulator sets the average power of the light and reduces noise at low frequency (up to 10 kHz). The light is then used to trap single sodium atoms in an Optical Tweezer, where the lifetime of the atoms is limited by parametric heating due to laser noise at twice the trapping frequency. With our noise eater, the noise is reduced by up to 15 dB at these frequencies and the lifetime of the atom in the Optical Tweezer is increased by an order of magnitude to around 6 seconds. Our technique is general and acts directly on the laser beam, expanding laser options for sensitive Optical trapping applications.
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forming a single molecule by magnetoassociation in an Optical Tweezer
2020Co-Authors: J Zhang, William Cairncross, Kenneth Wang, Lewis R B Picard, J D HoodAbstract:We demonstrate the formation of a single NaCs molecule in an Optical Tweezer by magnetoassociation through an s-wave Feshbach resonance at 864.11(5) G. Starting from single atoms cooled to their motional ground states, we achieve conversion efficiencies of 47(1)%, and measure a molecular lifetime of 4.7(7) ms. By construction, the single molecules are predominantly [77(5)%] in the center-of-mass motional ground state of the Tweezer. Furthermore, we produce a single p-wave molecule near 807 G by first preparing one of the atoms with one quantum of motional excitation. Our creation of a single weakly bound molecule in a designated internal state in the motional ground state of an Optical Tweezer is a crucial step towards coherent control of single molecules in Optical Tweezer arrays.
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multichannel interactions of two atoms in an Optical Tweezer
2020Co-Authors: J Zhang, Kenneth Wang, J D Hood, Yenwei Lin, Lee R LiuAbstract:The authors present a new technique for characterizing the scattering and Feshbach resonances of two different species atoms. A single ultracold Na and Cs atom are trapped in the same Optical Tweezer and cooled to the ground state. The interactions of the two atoms modify their motional trapping frequencies, which are measured spectroscopically and used to characterize the scattering properties.
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multichannel interactions of two atoms in an Optical Tweezer
2019Co-Authors: J Zhang, Kenneth Wang, J D Hood, Yenwei Lin, Lee R LiuAbstract:The multichannel Na-Cs interactions are characterized by a series of measurements using two atoms in an Optical Tweezer, along with a multichannel quantum defect theory (MQDT). The triplet and singlet scattering lengths are measured by performing Raman spectroscopy of the Na-Cs motional states and least-bound molecular state in the Tweezer. Magnetic Feshbach resonances are observed for only two atoms at fields which agree well with the MQDT. Our methodology, which promotes the idea of an effective theory of interaction, can be a key step towards the understanding and the description of more complex interactions. The Tweezer-based measurements in particular will be an important tool for atom-molecule and molecule-molecule interactions, where high densities are experimentally challenging and where the interactions can be dominated by intra-species processes.
Chuanwei Zhang - One of the best experts on this subject based on the ideXlab platform.
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supersymmetry assisted high fidelity ground state preparation of a single neutral atom in an Optical Tweezer
2021Co-Authors: X Luo, Mark G. Raizen, Chuanwei ZhangAbstract:Arrays of neutral-atom qubits in Optical Tweezers are a promising platform for quantum computation. Despite experimental progress, a major roadblock for realizing neutral-atom quantum computation is the qubit initialization. Here we propose that supersymmetry, a theoretical framework developed in particle physics, can be used for ultrahigh-fidelity initialization of neutral-atom qubits. We show that a single atom can be deterministically prepared in the vibrational ground state of an Optical Tweezer by adiabatically extracting all excited atoms to a supersymmetric auxiliary Tweezer. The scheme works for both bosonic and fermionic atom qubits trapped in realistic Gaussian Optical Tweezers and may pave the way for realizing large-scale quantum computation, simulation, and information processing with neutral atoms.
William Cairncross - One of the best experts on this subject based on the ideXlab platform.
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assembly of a rovibrational ground state molecule in an Optical Tweezer
2021Co-Authors: J Zhang, William Cairncross, Kenneth Wang, Lewis R B PicardAbstract:We demonstrate the coherent creation of a single NaCs molecule in its rotational, vibrational, and electronic (rovibronic) ground state in an Optical Tweezer. Starting with a weakly bound Feshbach molecule, we locate a two-photon transition via the |c^{3}Σ_{1},v^{'}=26⟩ excited state and drive coherent Rabi oscillations between the Feshbach state and a single hyperfine level of the NaCs rovibronic ground state |X^{1}Σ,v^{''}=0,N^{''}=0⟩ with a binding energy of D_{0}=h×147044.63(11) GHz. We measure a lifetime of 3.4±1.6 s for the rovibronic ground state molecule, which possesses a large molecule-frame dipole moment of 4.6D and occupies predominantly the motional ground state. These long-lived, fully quantum-state-controlled individual dipolar molecules provide a key resource for molecule-based quantum simulation and information processing.
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forming a single molecule by magnetoassociation in an Optical Tweezer
2020Co-Authors: J Zhang, William Cairncross, Kenneth Wang, Lewis R B Picard, J D HoodAbstract:We demonstrate the formation of a single NaCs molecule in an Optical Tweezer by magnetoassociation through an s-wave Feshbach resonance at 864.11(5) G. Starting from single atoms cooled to their motional ground states, we achieve conversion efficiencies of 47(1)%, and measure a molecular lifetime of 4.7(7) ms. By construction, the single molecules are predominantly [77(5)%] in the center-of-mass motional ground state of the Tweezer. Furthermore, we produce a single p-wave molecule near 807 G by first preparing one of the atoms with one quantum of motional excitation. Our creation of a single weakly bound molecule in a designated internal state in the motional ground state of an Optical Tweezer is a crucial step towards coherent control of single molecules in Optical Tweezer arrays.
J Zhang - One of the best experts on this subject based on the ideXlab platform.
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assembly of a rovibrational ground state molecule in an Optical Tweezer
2021Co-Authors: J Zhang, William Cairncross, Kenneth Wang, Lewis R B PicardAbstract:We demonstrate the coherent creation of a single NaCs molecule in its rotational, vibrational, and electronic (rovibronic) ground state in an Optical Tweezer. Starting with a weakly bound Feshbach molecule, we locate a two-photon transition via the |c^{3}Σ_{1},v^{'}=26⟩ excited state and drive coherent Rabi oscillations between the Feshbach state and a single hyperfine level of the NaCs rovibronic ground state |X^{1}Σ,v^{''}=0,N^{''}=0⟩ with a binding energy of D_{0}=h×147044.63(11) GHz. We measure a lifetime of 3.4±1.6 s for the rovibronic ground state molecule, which possesses a large molecule-frame dipole moment of 4.6D and occupies predominantly the motional ground state. These long-lived, fully quantum-state-controlled individual dipolar molecules provide a key resource for molecule-based quantum simulation and information processing.
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forming a single molecule by magnetoassociation in an Optical Tweezer
2020Co-Authors: J Zhang, William Cairncross, Kenneth Wang, Lewis R B Picard, J D HoodAbstract:We demonstrate the formation of a single NaCs molecule in an Optical Tweezer by magnetoassociation through an s-wave Feshbach resonance at 864.11(5) G. Starting from single atoms cooled to their motional ground states, we achieve conversion efficiencies of 47(1)%, and measure a molecular lifetime of 4.7(7) ms. By construction, the single molecules are predominantly [77(5)%] in the center-of-mass motional ground state of the Tweezer. Furthermore, we produce a single p-wave molecule near 807 G by first preparing one of the atoms with one quantum of motional excitation. Our creation of a single weakly bound molecule in a designated internal state in the motional ground state of an Optical Tweezer is a crucial step towards coherent control of single molecules in Optical Tweezer arrays.
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multichannel interactions of two atoms in an Optical Tweezer
2020Co-Authors: J Zhang, Kenneth Wang, J D Hood, Yenwei Lin, Lee R LiuAbstract:The authors present a new technique for characterizing the scattering and Feshbach resonances of two different species atoms. A single ultracold Na and Cs atom are trapped in the same Optical Tweezer and cooled to the ground state. The interactions of the two atoms modify their motional trapping frequencies, which are measured spectroscopically and used to characterize the scattering properties.
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multichannel interactions of two atoms in an Optical Tweezer
2019Co-Authors: J Zhang, Kenneth Wang, J D Hood, Yenwei Lin, Lee R LiuAbstract:The multichannel Na-Cs interactions are characterized by a series of measurements using two atoms in an Optical Tweezer, along with a multichannel quantum defect theory (MQDT). The triplet and singlet scattering lengths are measured by performing Raman spectroscopy of the Na-Cs motional states and least-bound molecular state in the Tweezer. Magnetic Feshbach resonances are observed for only two atoms at fields which agree well with the MQDT. Our methodology, which promotes the idea of an effective theory of interaction, can be a key step towards the understanding and the description of more complex interactions. The Tweezer-based measurements in particular will be an important tool for atom-molecule and molecule-molecule interactions, where high densities are experimentally challenging and where the interactions can be dominated by intra-species processes.