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N = 19 rubidium atoms are loaded with holographic optical tweezers in a zig-zag chain and entangled through collective Rabi oscillation to Rydberg state. Resulting coherent dynamics manifests quantum simulation of 1D quantum-Ising model with controlled frustrations.
We report a new method to load N=20 single-atoms near-deterministically (90% for 3-by-3 square and 80% for N=19 ring lattice) in 2D lattices, using dynamic holographic optical tweezers implemented with a 2D liquid-crystal spatial-light modulator.
We demonstrate trapping and dynamic reconfiguration of rubidium single-atom arrays in 3D holographic potential traps formed by a phase-only spatial light modulator (SLM). Atom loss caused by the limited response time of SLM liquid crystals is resolved by a simple, alternative way of phase-patterning.
In this paper, we report the first observation of terahertz (THz) frequency lattice vibrations in naturally occurring seraphinite gemstones. Seraphinite is a particular form of clinochlore minerals in the chlorite group, and the THz frequency response of any chlorite minerals has been unknown. Here, we show, based on our THz time-domain spectroscopic measurements, that there are three absorption modes...
Complete population inversion of two-level atoms in a magneto-optical trap is demonstrated by off-resonant two laser pulses shaped from a single ultrafast laser pulse. The observed phenomenon is explained in the context of femto-second laser version of Stark-chirped rapid adiabatic passage.
The natural seraphinite has the optical phonon modes in the frequency range from 0.1 to 2 THz. The observed absorption modes at 0.8, 1.2, and 0.96 THz are understood as infrared active phonon modes of Au(z) and Bu(x, y) symmetries, respectively. The 0.96 THz mode is, in particular, strong and narrow comparable to the reported 0.53 THz mode in a-lactose monohydrate. Experiments carried out by THz time-domain...
We show that the 24 energy levels involved in the D1 transition of atomic Rb85 are reduced to independent 12 two-level systems of a single Rabi frequency by Morris-Shore transformation. Experiment performed with ultrafast laser interacting with cold atoms in a MOT confirms the prediction.
We develop a spectral encoding image technique in the terahertz range using a space-frequency converting metasurface. From our developed technique, 2-dimensional images are successfully reconstructed using only 1-dimensional data acquisition processes.
Spectro-spatial coherent control methods are reported demonstrating optimized resonant two-photon transitions of rubidium atomic vapor by counter-propagating ultrashort pulse pairs. By properly programming the spectral sign changes across resonance frequencies, unlike non-resonant two-photon transitions, the resonant two-photon transitions probabilities could be enhanced, experiment finds.
Using terahertz time-domain spectroscopy (THz-TDS), we measured optical constants of nine different types of common natural stones: slate, gneiss, marble, mudstone, sandstone, dolomite, granite, tuff, and diorite. The result shows that most natural stones are fairly transparent in THz frequency range, and dolomite, in particular, exhibits a nearly uniform refractive index of 2.7 over frequency range...
This work presents tailored index in terahertz broadband frequency by a subwavelength silicon honeycomb structures. The structure is fabricated by deep reactive ion etching process and their indices are tailored depending on size of structures.
Terahertz polarization shaping technique is developed. We have used the combination of wedge-type diffractive optical components in conjunction with a circular InAs pattern to produce various THz waves with temporally-evolving polarization states.
We demonstrate π phase-gate control of cold rubidium atoms in a magneto-optical trap. For this, we utilize ultrafast pulse-shaping technique, and the quantum interference of two-photon ionization is tested as a function of the phase-gate position.
Terahertz pulse generation from circular InAs apertures of sub-wavelength diameter is studied. Temporal advancement occurs for the pulses generated from sub-wavelength excitation InAs apertures. This behavior is explained by the dependency of excitation intensity and size, and can be applied to recognition of sub-wavelength-size patterns.
We demonstrate coherent control of multiphoton absorption in a dynamically shifted energy level structure. In a three-level model system of atomic sodium, we controlled the quantum interference of sequential 2+1 photons and direct three-photon transitions.
We demonstrate quantum control of two-photon inter-excited states transitions in a V-type atomic system. By varying linear and quadratic chirps, we project the transitions to coherent transient phenomena in a two-level system.
We propose and demonstrate single-pixel coherent diffraction imaging with ultrafast THz waves, whereby all the spatial frequency components processed by a spatial phase retarder are simultaneously measured by a fixed-location single-pixel detector.
This work presents a plasmon-enhanced photo-conductive antenna for high power THz emission using the localized surface plasmon resonance of hierarchically patterned silver nanoislands. The silver nanoislands on a photoconductive region enhance the electrical amplitude of pump laser beam and the scattering of the pump beam so that the optical power transmitted toward the substrate is amplified. As...
We devised and demonstrated terahertz emission from an optical fiber tip coated with InAs thin film illuminated by guided laser field and achieved λ/20 sub-wavelength imaging in an InAs-based transmissive near-field laser emission THz microscope.
We devised and demonstrated coherent optical computing for single-point terahertz imagery, the physics of which is based on one-to-one mapping of spatial frequency components of an object to broadband terahertz spectrum.
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