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Plasmonics and nanophotonics II

14:00 Invited talk : Large Spontaneous Emission Rate Enhancement using Slot-Antenna Coupled WSe2 Monolayers

Michael Eggleston, Sujay Desai, Kevin Messer, Surabhi Madvapathy, Jun Xiao, Seth Fortuna, Xiang Zhang, Eli Yablonovitch, Ali Javey, Ming Wu

University of California (USA)

In this talk I will explore the use of slot-antennas to efficiently enhance spontaneous emission rates in 2D semiconductors. Experimental results will be presented showing a 340x rate increase for WSe2 monolayers coupled to a cavity-backed slot-antenna with ~1ps carrier lifetimes.
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14:20 : Photon-Spin Drag on a Metasurface

Xiang Zhang, Xingjie Ni

University of California (USA)

Strong spin-orbit interaction can be induced by strong light bending effect on a metasurface - an optically thin layer of plasmonic elements which have unique property of locally tailoring the field amplitude and phase at the nanoscale accompanied by dramatic light confinement. We show that the photon spin angular momentum can be directly transferred to collective motion of electrons on a conductive metasurface with this interaction, revealing as a photon-spin drag effect.
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14:35 : Bowtie Nanocavities for Single Plasmon Lasing Devices

Claire Deeb (1),Ankun Yang (2),Yi Hua (2),Teri Odom (2)

(1)Laboratoire de Photonique et de Nanostructures LPN-CNRS (France) , (2)Northwestern University (USA)

We demonstrate a three-dimensional (3D) active bowtie nano-resonator that has directional emission, high radiative efficiency, effective cavity feedback, ultrafast response, and room-temperature operation. The 3D bowtie structure consists of a dimer of Au nanoparticles with a gap size of tens of nanometers, arranged in a pattern with tunable periodicity and embedded in dye solution.
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14:50 : Resonant Enhancement of Near UV Fluorescence by Aluminum Nanoantenna Arrays

Neciah Dorh, J. Stokes, A. Sarua, M. J. Cryan

University of Bristol (United Kingdom)

This paper demonstrates up to 23-fold increase in fluorescence emission in the near UV from aluminum nanoantenna arrays. A series of aluminum nanorod arrays were fabricated using Focused Ion Beam (FIB) milling and subsequently spin-coated with Exalite 392E dye. Scanning photoluminescence measurements revealed a significant increase in the peak emission over the nanoantennas compared to the surrounding un-patterned aluminum or glass.
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15:05 : Studying ultrafast dynamics of advanced optical nanoantennas by photoemission electron microscopy

Matthias Falkner (1),Thomas Kaiser (1),Jing Qi (1),Michael Steinert (1),Christoph Menzel (1),Carsten Rockstuhl (2),Thomas Pertsch (1)

(1)Friedrich Schiller Universitat (Germany) , (2)Karlsruhe Institute of Technology (Germany)

We theoretically and experimentally investigate the ultrafast dynamics of circular plasmonic disc nanoantennas with the help of photoemission electron microscopy. The investigations show detailed insights into the spatio-temporal properties of the plasmonic resonance mechanism without the need for any disturbing interacting probe.
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15:20 : Active plasmon and Wood's anomaly sensor for carbon dioxide gas

Kenzo Yamaguchi (1),Masamitsu Fujii (2)

(1)Kagawa University (Japan) , (2)Toba National College of Maritime Technology (Japan)

We have achieved electrically tuned the surface plasmon resonance wavelength at visible range with controlling grating gaps structure by the numerical simulation. In the infrared range, we have also observed unusual diffraction due to Wood's anomaly and showed that the resonance wavelength can be shifted using the structure. Moreover, we decided the relationship between these resonances and structural conditions. Finally, we demonstrated for carbon dioxide gas sensing applications using the Wood's anomaly resonance.
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15:35 : Optical Properties of Surface Phonon Polaritons in Asymmetric Silicon Carbide Nanopillars

J. G. Tischler (1),Chase Ellis (1),O. J. Glembocki (1),D. N. Chigrin (2),F. J. Bezares (3),R. Kasica (4),L. Shirey (1),J. C. Owrutsky (1),J. D. Caldwell (1)

(1)U.S. Naval Research Laboratory (USA) , (2)RWTH Aachen University (Germany) , (3)ICFO-The Institute of Photonic Sciences (Spain) , (4)Center for Nanoscale Technology (USA)

Interactions between infrared light and polar dielectrics yield fundamental collective oscillations of lattice charges (surface phonon polaritons) that give rise to plasmonic-like effects with low optical losses. We explore such excitations through polarized, mid-infrared spectroscopy performed on asymmetric, rectangular silicon-carbide nanopillar arrays. Spectra reveal over 8 resonances that strongly depend upon the nanopillar geometry and incident polarization. Measurements are in excellent agreement with finite element simulations, which provide insights into the nature of the surface phonon polariton modes.
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15:50 : Fine tune of pulley-type ring resonators

Chii-Chang Chen, Dong-Po Cai, Chien-Chieh Lee

National Central University (Taiwan)

We show the theoretical and experimental results of the pulley-type microring in which we propose to enlarge the propagation constant difference between the bus waveguide and the ring waveguide to enhance the Q-factor. The experimental result shows that the Q-factor can be over 170,000 by tuning the bus waveguide width.
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16:05 : Fano resonance induced by magnetic toroidal moment in hybrid plasmonic-dielectric nanostructures

Jun-Jun Xiao (1),Qiang Zhang (1),Dezhuan Han (2),L. Gao (3)

(1)Harbin Institute of Technology (China) , (2)Chongqing University (China) , (3)Soochow University (China)

Fano resonance is ubiquitous in plasmonic structures, resulting from interference between a bright mode and a dark mode. Toroidal dipole resonances, which are in general of high-Q, represent an important response in toroidal metamaterials. We study the Fano resonance effect arising from the toroidal resonances in various plasmonic-dielectric nanostructures. It is shown showed that extinction, transmission, and photoluminescence can feature the Fano interaction which is important for the macroscopic properties, enabling efficient design of unique photonic nanostructures and metamaterials.
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