I present results of a search for new physics performed by measuring isotope shifts (IS) in Yb+ at the Vuletić group at MIT and discuss plans to perform IS spectroscopy of Ca+ with Jonathan Home's group at ETH. Isotope shifts, when measured on at least two atomic transitions can be displayed in a King plot. The presence of nonlinearities in such a plot indicates the existence of effects beyond the expected first-order standard model (SM) contributions to the IS's. We measured IS's on three narrow transitions in five isotopes of Yb+ and observe King nonlinearity with more than 40 sigma confidence. Further, we find 4-sigma evidence that there are at least two distinct physical effects contributing to the observed nonlinearity. We identify the largest effect as originating from isotope-dependent differences in the 4th-order nuclear charge moment. We discuss possible sources of the second nonlinearity and find that it likely cannot be explained by the expected next-largest SM contribution.
We demonstrated the optical microscope (OM) combined with nanopipette-based quartz tuning fork - atomic force microscope (QTF-AFM) for nanolithography. The nanoparticle (Au, 5 nm), nanowire, PDMS solutions are ejected onto the substrate through the nano/microaperture of the pulled pipette, and the nano/microscale objects were in-situ formed on the surface with the proposed patterning system, while the position is defined by monitoring the phenomena on the substrate with a home-made OM. After forming of capillary condensation between apex of the pipette tip and the surface, the electric field is applied to extract out the inside liquid to the substrate and the nano/microscale objects are fabricated. The nanoscale patterning size can be controlled by the aperture diameters of the pulled pipette.
KEYWORDS: Near field scanning optical microscopy, Acoustics, Quartz, Resonators, Near field optics, Crystals, Atomic force microscopy, Sensors, Signal detection, Spatial resolution
We suggest two methods attaching tip to the quartz crystal resonator to be applied to a near-field optical scanning microscope probe. High-speed near-field scanning optical microscopy images obtained with the quartz crystal resonator probe are presented. We have achieved fast scanning imaging at the scanning speed of 1.3 mm/s without any compromise of spatial lateral resolution. Applying a concept of the acoustic wave, the topographic image of soft sample with the quartz crystal resonator probe is interpreted.
We propose tow new methods to stabilize both the frequency and power of a two-longitudinal-mode He-Ne laser by using the frequency dependence of beat-noise power spectral density of the two-mode laser. The frequency and power stability of two methods are analyzed and compared briefly. Our study shows that the theoretical frequency and power stability could be achieved to 4.8 X (10-10 - 10-11) and 1.3 X (10-3 - 10-4), respectively.
We study the cavity QED effects (modified decay rates and energy level shift) of an atom inside a cylindrical hollow fiber and outside a solid fiber using linear-response formalism. Next, we suggest the Sisyphus cooling process occurring inside the hollow fiber with blue-detuned evanescent wave and as a preliminary example, we show a Monte-Carlo simulation of the atoms in the conical hollow system. We also propose that the similar cooling process is expected in the dark hollow beam (doughnut beam) obtained from the hollow fiber of step index, which is more desirable than the case when atoms are inside the fiber since there is no attracting Van der Waals force.
We present a novel and simple atom trap in a pyramidal and a conical hollow mirror cavity and its application to atom optics. Using a conical axicon mirror trap, we also have produced a pulsed cold atomic beam extracted from the trapped atoms. We point out several novel features of our cold atomic beams.
We report the recent progress of the experiments on guiding atoms by evanescent waves in micron-sized hollow optical fibers. The lateral manipulation accuracy is enhanced up to 1 micron with a large increase of more than 50 times on the guided atom flux. Moreover, the frequency tuning enables the fine control of the guided flux with a numerical accuracy of 10 atom/s. The atom-guidance scheme is applied to in-line isotope separation on rubidium atoms and measurement of the cavity quantum electrodynamic effect in a cylindrical dielectric. In addition, the feasibility of fabricating micron-sized structures with nanometric depth is discussed including the manipulation of a small number of laser-cooled atoms.
We have built a compact extended cavity diode laser system having microwave sidebands. Using the laser system, we could separate two stable isotopes of rubidium simultaneously trapped in a magneto-optical trap. We also have realized a very simple atom trap in a pyramid-shaped hollw mirror system and a conical hollow mirror using a single beam.
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