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Tassin, Philippe; Koschny, Thomas; Kafesaki, Maria; Soukoulis, Costas M. |
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A comparison of graphene, superconductors and metals as conductors for metamaterials and plasmonics |
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2012 |
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Nature Photonics |
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Nat. Photon. |
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6 |
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4 |
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259-264 |
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fromIPMRAS |
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Recent advancements in metamaterials and plasmonics have promised a number of exciting applications, in particular at terahertz and optical frequencies. Unfortunately, the noble metals used in these photonic structures are not particularly good conductors at high frequencies, resulting in significant dissipative loss. Here, we address the question of what is a good conductor for metamaterials and plasmonics. For resonant metamaterials, we develop a figure-of-merit for conductors that allows for a straightforward classification of conducting materials according to the resulting dissipative loss in the metamaterial. Application of our method predicts that graphene and high-Tc superconductors are not viable alternatives for metals in metamaterials. We also provide an overview of a number of transition metals, alkali metals and transparent conducting oxides. For plasmonic systems, we predict that graphene and high-Tc superconductors cannot outperform gold as a platform for surface plasmon polaritons, because graphene has a smaller propagation length-to-wavelength ratio. |
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RPLAB @ gujma @ |
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790 |
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Mariantoni, Matteo; Wang, H.; Bialczak, Radoslaw C.; Lenander, M.; Lucero, Erik; Neeley, M.; O'Connell, A. D.; Sank, D.; Weides, M.; Wenner, J.; Yamamoto, T.; Yin, Y.; Zhao, J.; Martinis, John M.; Cleland, A. N. |
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Title |
Photon shell game in three-resonator circuit quantum electrodynamics |
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Journal Article |
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2011 |
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Nature Physics |
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Nat. Phys. |
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7 |
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4 |
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287-293 |
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fromIPMRAS |
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The generation and control of quantum states of light constitute fundamental tasks in cavity quantum electrodynamics (QED). The superconducting realization of cavity QED, circuit QED (refs 11, 12, 13, 14), enables on-chip microwave photonics, where superconducting qubits control and measure individual photon states. A long-standing issue in cavity QED is the coherent transfer of photons between two or more resonators. Here, we use circuit QED to implement a three-resonator architecture on a single chip, where the resonators are interconnected by two superconducting phase qubits. We use this circuit to shuffle one- and two-photon Fock states between the three resonators, and demonstrate qubit-mediated vacuum Rabi swaps between two resonators. By shuffling superposition states we are also able to demonstrate the high-fidelity phase coherence of the transfer. Our results illustrate the potential for using multi-resonator circuits as photon quantum registers and for creating multipartite entanglement between delocalized bosonic modes. |
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RPLAB @ gujma @ |
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838 |
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Kosako, Terukazu; Kadoya, Yutaka; Hofmann, Holger F. |
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Title |
Directional control of light by a nano-optical Yagi–Uda antenna |
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2010 |
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Nature Photonics |
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Nat. Photon. |
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4 |
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312 - 315 |
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optical antennas |
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The plasmon resonance of metal nanoparticles can direct light from optical emitters in much the same way that radiofrequency antennas direct the emission from electrical circuits. Recently, rapid progress has been made in the realization of single-element antennas for optical waves. Because most of these devices are designed to optimize the local near-field coupling between the antenna and an emitter, the possibility of modifying the spatial radiation pattern has not yet received as much attention. In the radiofrequency regime, a typical antenna design for high directivity is the Yagi–Uda antenna, which essentially consists of a one-dimensional array of antenna elements driven by a single feed element. By fabricating a corresponding array of nanoparticles, similar radiation patterns can be obtained in the optical regime. Here, we present the experimental demonstration of directional control of radiation from a nano-optical Yagi–Uda antenna composed of appropriately tuned gold nanorods. |
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RPLAB @ gujma @ |
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747 |
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Fazal, Furqan M.; Block, Steven M. |
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Title |
Optical tweezers study life under tension |
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Year |
2011 |
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Nature Photonics |
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Nat. Photon. |
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5 |
Issue |
6 |
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318-321 |
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fromIPMRAS |
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Optical tweezers have become one of the primary weapons in the arsenal of biophysicists, and have revolutionized the new field of single-molecule biophysics. Today's techniques allow high-resolution experiments on biological macromolecules that were mere pipe dreams only a decade ago. |
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RPLAB @ gujma @ |
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776 |
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Wu, Ming C. |
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Title |
Optoelectronic tweezers |
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2011 |
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Nature Photonics |
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Nature Photon |
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5 |
Issue |
6 |
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322-324 |
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Using projected light patterns to form virtual electrodes on a photosensitive substrate, optoelectronic tweezers are able to grab and move micro- and nanoscale objects at will, facilitating applications far beyond biology and colloidal science. |
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775 |
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