Bulletin of the American Physical Society
Fall 2015 Joint Meeting of the Texas Section of the AAPT, Texas Section of the APS and Zone 13 of the Society of Physics Students
Volume 60, Number 15
Thursday–Saturday, October 29–31, 2015; Waco, Texas
Session F2: Surface/Plasmon Physics |
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Chair: Zhenrong Zhang, Baylor University Room: A.108 |
Friday, October 30, 2015 1:30PM - 1:42PM |
F2.00001: Plasmon-Induced O$_{\mathrm{2}}$ Dissociation on Ag(111) Blake Birmingham, Zachary Liege, Dmitri Voronine, Kenneth Park, Zhenrong Zhang, Marlan Scully Dissociation of O$_{\mathrm{2}}$ molecules is the rate limiting process in many catalytic reactions on metal catalysts. Ordinarily the O$_{\mathrm{2}}$ dissociation process requires a large input of thermal energy and is therefore conducted at high temperatures. We have studied this reaction by exploitation of localized plasmon resonances at conducting nanoparticles at relatively low temperatures. Nanostructures were prepared on Ag(111) by roughening the surface via Ar$^{\mathrm{+}}$ sputtering. Localized plasmonic resonances were excited with an incident 532nm laser. Excitation of the O$_{\mathrm{2}}$ by the enhanced electric fields near nanostructures can lead to dissociation of the molecule into its constituent components. This dissociation is evidenced by adsorbate oxygen atoms on surface of Ag(111) in proximity to nanostructures, observable by Scanning Tunneling Microscope. [Preview Abstract] |
Friday, October 30, 2015 1:42PM - 1:54PM |
F2.00002: Controllable Goos-Hanchen shift in Graphene ribbons array. Xiaodong Zeng, M. Al-Amri, M. Suhail Zubairy The Goos- Hanchen (GH) shift of light beam incident on Graphene ribbons array is investigated. Due to the resonance effects of leaky surface plasmons on the ribbons, the zeroth-order reflection field shows both large positive and negative GH shifts even for single layer ribbons. Taking advantage of the strong electro-optical tunability of Graphene plasmons, we can control the shift conveniently. This effect paves a promising way to manipulate terahertz and mid-infrared light beam via Graphene. [Preview Abstract] |
Friday, October 30, 2015 1:54PM - 2:06PM |
F2.00003: Topological phase transitions in superradiance lattices Han Cai Topological phases of matter are of fundamental interest and have promising applications. Fascinating topological properties of light have been unveiled in classical optical materials. However, the manifestation of topological physics in quantum optics has not been discovered. Here we study the topological phases in a two-dimensional momentum-space superradiance lattice composed of timed Dicke states (TDSs) in electromagnetically induced transparency (EIT). By periodically modulating the three EIT coupling fields, we can create a Haldane model with in situ tunable topological properties, which manifest themselves in the contrast between diffraction signals emitted by superradiant TDSs. The topological superradiance lattices provide a controllable platform for simulating exotic phenomena in condensed matter physics and offer a basis of topological quantum optics and novel photonic devices. [Preview Abstract] |
Friday, October 30, 2015 2:06PM - 2:18PM |
F2.00004: Single-photon Superradiance Dawei Wang Timed Dicke states (TDS), the phase-correlated single-photon superradiant states, have versatile interesting phenomena such as directional emission , cooperative Lamb shift, and collective Rabi oscillation which inspired quantum amplification by superradiant emission of radiation (QASER). It also has promising applications in Heisenberg limit metrology and X-ray reflection. Recently, we found that the TDS can simulate interesting condensed matter physics in easily controllable quantum optical systems. The TDS of a collection of three-level atoms can form a tight-binding lattice in momentum space, the superradiance lattice (SL). The quantum behavior of electrons in lattices, such as Wannier-Stark ladders and Bloch band collapsing can be simulated in the SL. The SL can be extended to two, three and higher dimensions where no real-space lattices exist and fascinating physics beckons. [Preview Abstract] |
Friday, October 30, 2015 2:18PM - 2:30PM |
F2.00005: Chemical Mapping of CuPc on MoS$_{2}$ using Tip-Enhanced Raman Scattering Zhe He, Dmitri Voronine, Alexander Sinyukov, Zachary Liege, Blake Birmingham, Khoby Moore, Ken Park, Zhenrong Zhang, Alexei Sokolov, Aleksey Akimov, Marlan Scully Enhanced Raman spectroscopies have been widely used for chemical analysis. In surface enhanced Raman scattering (SERS) and tip enhanced Raman scattering (TERS) noble metals such as gold and silver are usually the best substrates with largest Raman enhancement due to strong electromagnetic mechanisms. On the other hand, semiconductor substrates give Raman enhancement based on the chemical mechanism. Here both SERS and TERS are applied to copper phthalocyanine (CuPc) molecules on bulk MoS$_{2}$ substrate. We observe shift of the hot spots as a response of the sample to the TERS tip. The combination of SERS and TERS on MoS$_{2}$ may be applied in chemical analysis of 2D materials and bio-sensing. [Preview Abstract] |
Friday, October 30, 2015 2:30PM - 2:42PM |
F2.00006: \textbf{Locking a laser beam in the vibrational motion of the dipoles on a dielectric surface} Cristian Bahrim, Wei-Tai Hsu, Azam Nurul Coupling two lasers of different intensities and wavelengths inside bulk matter, also known as EIT, has applications in slowing down light. EIT essentially transforms an opaque material to a given radiation into a transparent one, and can be applied in new optoelectronic devices, including quantum circuits, and in quantum computing. The main challenge in using this procedure comes from the difficulty in the coherent retrieval of the light signal squeezed inside the bulk matter after the EIT process ceases. We propose an alternative to the EIT mechanism in which we use the interaction between a weak probe laser beam reflected near the Brewster angle and a stronger coupling laser beam directed at normal incidence toward the same dielectric surface. As opposed to a classical EIT-type phenomenon, in our case (1) the dielectric is \textit{transparent} to both incident lasers, and (2) the coupling between the two beams is realized \textit{on }the dielectric surface, within one dipole layer in thickness. The signature of the coupling between the two lasers is indicated by (1) a shift in the value of the Brewster angle measured in the direction of the reflected probe beam toward a value associated to the electric permittivity of the dielectric in interaction with the stronger laser alone, and (2) an interference pattern near Brewster angle with several minima, which can be interpreted similarly as for light diffraction patterns. This result indicates that we can lock a laser beam on a dielectric surface. [Preview Abstract] |
Friday, October 30, 2015 2:42PM - 2:54PM |
F2.00007: Single Photon Transport through an Atomic Chain Coupled to a One-dimensional Nanophotonic Waveguide Zeyang Liao, Xiaodong Zeng, Shi-Yao Zhu, M. Suhail Zubairy We study the dynamics of a single photon pulse travels through a linear atomic chain coupled to a one-dimensional (1D) single mode photonic waveguide. We derive a time-dependent dynamical theory for this collective many-body system which allows us to study the real time evolution of the photon transport and the atomic excitations. Our analytical result is consistent with previous numerical calculations when there is only one atom. For an atomic chain, the collective interaction between the atoms mediated by the waveguide mode can significantly change the dynamics of the system. The reflectivity of a single photon pulse with finite bandwidth can even approach 100{\%}. The spectrum of the reflected and transmitted photon can also be significantly different from the single atom case. Many interesting physical phenomena can occur in this system such as the photonic bandgap effects, quantum entanglement generation, Fano-like interference, and superradiant effects. For engineering, this system may serve as a single photon frequency filter, single photon modulation and may find important applications in quantum information. [Preview Abstract] |
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