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Laser Trapping of Circular Rydberg Atoms
摘要： Rydberg atoms are remarkable tools for quantum simulation and computation. They are the focus of an intense experimental activity, mainly based on low-angular-momentum Rydberg states. Unfortunately, atomic motion and levels lifetime limit the experimental timescale to about 100 μs. Here, we demonstrate two-dimensional laser trapping of long-lived circular Rydberg states for up to 10 ms. Our method is very general and opens many opportunities for quantum technologies with Rydberg atoms. The 10 ms trapping time corresponds to thousands of interaction cycles in a circular-state-based quantum simulator. It is also promising for quantum metrology and quantum information with Rydberg atoms, by bringing atom-field interaction times into unprecedented regimes.
关键词： circular Rydberg states,quantum computation,Rydberg atoms,quantum simulation,laser trapping
更新于2025-09-23 15:19:57
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In situ reflection imaging and microspectroscopic study on three-dimensional crystal growth of L-phenylalanine under laser trapping
摘要： We investigate growth behavior of an L-phenylalanine crystal formed by laser trapping with the use of reflection imaging and microspectroscopy. Optical reflection micrographs show colored images of the crystal due to constructive interference of incident white light. The color distribution on the crystal is dynamically changed under laser trapping, which is in addition to enlargement of the crystal plane area. The temporal change in the crystal thickness is examined by measuring reflection spectra of the crystal. We discuss the three-dimensional crystal growth under laser trapping by comprehensively considering the changes in crystal thickness and crystal plane area.
关键词： reflection imaging,laser trapping,L-phenylalanine,crystal growth,microspectroscopy
更新于2025-09-11 14:15:04
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Chemo-treated 4T1 breast cancer cells radiation response measured by single and multiple cell ionization using infrared laser trap
摘要： We present a study that uses a laser trapping technique for measurement of radiation sensitivity of untreated and chemo-treated cancer cells. We used a human mammary tumor cell line (4T1) treated by an antitumor compound, 2-Dodecyl-6-methoxycyclohexa-2, 5-diene-1,4-dione (DMDD), which was extracted from the root of Averrhoa carambola L. The untreated control group, and both 2-hour and 24-hour treated groups of 4T1 cells were used in this study. The absorbed threshold ionization energy (TIE) and the threshold radiation dose (TRD) were determined using a high-power infrared laser (at 1064 nm) trap by single and multiple cells trapping and ionization. The results were analyzed using descriptive and t-statistics. The relation of the TIE and TRD to the mass of the individual cells were also analyzed for different hours of treatment in comparison with the control group. Both TIE and TRD decrease with increasing treatment periods. However, the TRD decreases with mass regardless of the treatment. Analyses of the TRD for single vs multiple cells ionizations within each group have also consistently showed this same behavior regardless of the treatment. The underlying factors for these observed relations are explained in terms of radiation, hyperthermia, and chemo effects.
关键词： threshold ionization energy,chemo-treated cancer cells,threshold radiation dose,4T1 breast cancer cells,laser trapping technique,DMDD,radiation sensitivity
更新于2025-09-11 14:15:04
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Spontaneous continuous orbital motion of nanoparticles levitated in air
摘要： We report on the discovery of a unidirectional continuous orbital motion of nanoparticles which occurs spontaneously in room-temperature air and can be manipulated by light. Trapped nanoparticles exhibit a transition between Brownian particles in two separate lattice sites and orbiting particles in a single lattice site. The orbital motion is sensitive to air pressure and is vanishing at low pressure, suggesting that the orbital motion is supported by air. Our results pave the way for manipulating nanoscale objects on the basis of their cooperative dynamics.
关键词： Brownian motion,nanoparticles,laser trapping,orbital motion,optomechanics
更新于2025-09-09 09:28:46