Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session V02: Strong Light-matter Coupling and Enhanced Spectroscopy: Enhanced Spectroscopy and DynamicsFocus Session
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Sponsoring Units: DCP DAMOP Chair: James Coe, The Ohio State University Room: LACC 150B |
Thursday, March 8, 2018 2:30PM - 3:06PM |
V02.00001: Abstract Withdrawn Invited Speaker:
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Thursday, March 8, 2018 3:06PM - 3:18PM |
V02.00002: Signatures of Plexcitonic States in Molecular Electroluminescence Justin Bergfield, Joshua Hendrickson We investigate the electroluminescence (EL) of molecules confined between metallic electrodes and coupled to quantum plasmonic modes using a multi-particle quantum master equation (QME) approach. Within our general state-based framework, we describe electronic tunneling, vibrational damping, environmental dephasing, and the quantum coherent dynamics of coupled quantum electromagnetic field modes. As an example, we calculate the STM-induced spontaneous emission of a tetraphenylporphyrin (TPP) molecule coupled to a nanocavity plasmon. In the weak molecular exciton-plasmon coupling regime we find excellent agreement with experiments, including above-threshold hot luminescence, an effect not described by previous semiclassical calculations. In the strong coupling regime, we analyze the spectral features indicative of the formation of plexcitonic states, and the time-dependent quantum statistics of the emitted light. |
Thursday, March 8, 2018 3:18PM - 3:30PM |
V02.00003: Graphene-Plasmon-Assisted Fluorescence and Resonance Energy Transfer Liang-Yan Hsu Fluorescence and resonance energy transfer between two chromophores in the presence of nanostructures such as 2D materials is a fundamental subject in chemical physics. To explore the effects of doped graphene on the two phenomena, first, we model graphene plasmon as surface currents with conductivity calculated from the random phase approximation. Furthermore, based on macroscopic quantum electrodynamics, we can depict the chromophore-photon interactions around doped graphene and establish a theory which is general for fluorescence and resonance energy transfer in inhomogeneous, dispersive, and absorbing media. Besides, the theory allows us to develop a concept called "generalized spectral overlap" for understanding the frequency dependence of resonance energy transfer and a role played by graphene plasmon polariton in resonance energy transfer. We hope that this work can motivate further studies on fluorescence and resonance energy transfer in a variety of plasmonic nanostructures, with possible applications in spectroscopy, photonics, and energy devices. |
Thursday, March 8, 2018 3:30PM - 4:06PM |
V02.00004: Strong Coupling between Surface Phonon-Polaritons and Surface Plasmon-Polaritons Invited Speaker: Christian Huck Resonantly excited plasmonic nanostructures confine electromagnetic radiation on the nanoscale and therefore enhance the light-matter interaction, which can be used to increase the signature of excitations in the infrared. Here we discuss the coupling between surface phonon-polaritons and localized surface plasmon-polaritons. We perform IR spectroscopy of metal nanoantennas placed on SiO2 layers of different thickness. Due to strong coupling between the plasmonic excitation of the antennas and the surface phonon-polaritons of the thin SiO2 layers a splitting of the plasmonic resonance is found. Although the phonon-polaritons themselves are dark excitations under normal illumination, they strongly interact with plasmon-polaritons as we detail for a planar SiO2 layer beneath the nanostructures. The observed splitting can result in a transparency window, corresponding to suppression of antenna scattering, respectively “cloaking” of the antenna. Furthermore, we investigate the coupling of localized surface plasmon-polaritons to localized surface phonon polaritons of SiO2 ultra-fine dust particles. Our studies demonstrate the potential of plasmonic nanostructures for specific identification of ultra-fine dust particles and guide the way toward dust sensing devices based on SEIRA. |
Thursday, March 8, 2018 4:06PM - 4:18PM |
V02.00005: Near-field chemical mapping of gold nanostructures using a functionalized scanning probe. Chahinez Dab, Chawki Awada, Alexandre Merlen, Andreas Ruediger
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Thursday, March 8, 2018 4:18PM - 4:54PM |
V02.00006: Nonlinear optical molecular spectroscopy with quantum light and in microcavities Invited Speaker: Shaul Mukamel Nonlinear optical signals induced by quantized light fields and entangled photon pairs are predicted. Conventional nonlinear spectroscopy uses classical light to detect matter properties through the variation of its response with frequencies or time delays. Quantum light opens up new avenues for spectroscopy by utilizing parameters of the quantum state of light as novel control knobs and through the variation of photon statistics by coupling to matter. Novel signals are expressed using time-ordered multipoint correlation functions of superoperators in the joint field plus matter phase space. These are distinct from Glauber’s photon counting formalism which uses normally ordered products of ordinary operators in the field space. Entangled-photon pairs are not subjected to the classical Fourier limitations on their joint temporal and spectral resolution. |
Thursday, March 8, 2018 4:54PM - 5:06PM |
V02.00007: Optically induced tip-sample forces Brian O'Callahan, Jun Yan, Fabian Menges, Eric Muller, Markus Raschke Control of optical forces allows nanoparticle manipulation, atom trapping, and fundamental studies of light-matter interactions. Recent studies have claimed localization and detection of these weak forces between a tip and sample surface via infrared vibrational resonances providing for a potentially novel nano-imaging technique. However, the magnitude and spectral lineshape of the optically induced force disagree with recent theory. Through spectral and spatial force measurements, we show that the tip-sample force interaction is dominated by thermal expansion instead of optical gradient forces. Force spectra obtained on PMMA are symmetric, and match the absorption spectrum in contrast to dispersive s-SNOM and optical gradient force behavior. Thickness dependence shows increase in force signal beyond the thickness where the optical dipole force would saturate. Approach curves show that the force signal is confined to regions of physical contact between tip and sample. This strongly suggests that the force is dominated by thermal expansion. |
Thursday, March 8, 2018 5:06PM - 5:18PM |
V02.00008: Tip-induced Strong Coupling in a Single Quantum Dot Jiarong Wang, Kyoung-Duck Park, Haixu Leng, Jaron Kropp, Theodosia Gougousi, Matthew Pelton, Markus Raschke Light-matter interaction in the strong coupling regime has long been reported using, e.g., quantum dots (QDs), dye molecules, or J-aggregates with metallic nano-photonic structures. However, most of the experiments were performed with multiple emitters and with devices of no or limited tunability or complicated control. Here we induce, image, and control strong coupling with single QDs at room temperature in a tunable plasmonic nano-resonator formed by an optical antenna nano-tip and a planar Au surface. From spatial and spectral variations of the splitting of the tip-enhanced photoluminescence (TEPL) signal, we induce and quantify the strong coupling between excitons and gap plasmons. Through variation of tip-sample distance and thickness of a dielectric capping layer we control the confinement of the gap plasmon and hence the coupling strength. Similarly, lateral variation of tip position allows for nanometer scale imaging of the spatial dependence of the plasmon-exciton coupling strength. This antenna-tip-controlled strong coupling approach opens forms of single emitter coherently controlled devices. |
Thursday, March 8, 2018 5:18PM - 5:30PM |
V02.00009: Imaging Nanoscale Electric Fields at Au(111) Step Edges by Tip-Enhanced Raman Scattering Wayne Hess, Ashish Bhattarai, alan joly, patrick El-Khoury Tip-enhanced Raman scattering (TERS) can be used to image plasmon-enhanced local electric fields on the nanoscale. Our observed two-dimensional TERS images map electric fields localized at Au(111) step edges using silver atomic force microscope tips coated with 4-mercaptobenzonitrile molecules. We establish that such measurements are not only sensitive to spatial variations in the enhanced electric fields but also to their vector components. We also experimentally demonstrate that single nanometer precision is attainable in TERS nanoscopy using tips with radii on the order of 100-200 nm. Our results underscore the importance of considering molecular orientation and the tensorial nature of Raman scattering in interpreting TERS imaging measurements. To the best of our knowledge, these are the first TERS measurements of the vector components of plasmon-enhanced local electric fields. We anticipate that ensuing correlated electric field mapping and chemical imaging measurements, using TERS, will lead to a better understanding and broader applicability of this powerful technique. Overall, we illustrate the concept of electric field imaging via TERS and establish the connections between our observations and conventional TERS chemical imaging measurements. |
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