Plasmonics and nanophotonics V
14:00 : SHG in Non-Centrosymmetric Nanostructured Metamaterials
W. Luis Mochan (1),Bernardo S. Mendoza (2),Guillermo Ortiz (3)
(1)Universidad Nacional Autonoma de Mexico (Mexico) , (2)Centro de Investigaciones en Optica (Mexico) , (3)Universidad Nacional del Nordeste (Argentina) The surface of the nanoparticles in a composite metamaterial may be a source of strong SH radiation, but only if their geometry is itself non- centrosymmetric. We present an efficient scheme for its calculation.
14:15 : Plasmonic Couplers in Refractory Metals as Heat Generators for High Temperature Applications
Sara Nunez Sanchez, Hugo Andrade, C. Harwood, Ian Bickerton, Neil Fox, Martin Cryan
University of Bristol (United Kingdom) Plasmonic gratings have been fabricated using laser scribing in a refractory metal (molybdenum) for high temperature applications. The molybdenum micro-structures have been designed to generate heat from plasmon excitation in the mid-infrared (10.6um). Real time temperature measurements have been done achieving an increase of temperature of more than 150 percent when compared to flat molybdenum. The heat generation from light absorption will be analyzed in detail as a function of the plasmon excitation efficiency and temperature.
14:30 : Strong Light-Matter Interactions in Dielectric-Metallic Hybrid Nanostructures
Huanjun Chen, Zhang-Kai Zhou, Hao Wang
Sun Yat-sen University (China) By coating the Au nanospheres with dielectric shells, Fano resonances can be induced without symmetry breaking. Dimer structures composed of Au and silicon nanospheres can exhibit interesting unidirectional light scattering behaviors in the visible range. On the other hand, exotic avalanche multiphoton emission properties can be observed from the hybrid dielectric and plasmonic nanostructures based on anodic aluminum oxide (AAO). Such hybrid structures can further be used for tailoring the light emission spectra of the quantum dots.
14:45 : Tuning and Enhancement of the Magneto-Dielectric Behavior of Semiconductor Nanoparticles
Braulio Garcia-Camara, J. F. Algorri, V. Urruchi, J. M. Sanchez-Pena, R. Vergaz
Carlos III University of Madrid (Spain) Magneto-dielectric response of semiconductor nanoparticles has been recently shown as a useful phenomenon for several applications, e.g. sensors. The enhancement and spectral tuning of this behavior is a keynote aspect for some of these approaches. In this work, we show that the Mie resonances of nanoparticles composed of AlxGa1-xAs can be enhanced and tuning in a fine way by controlling the relation between the particle size and the concentration of Al atoms (x).
15:00 : Control of near-field focused photoemission by plasmonic nanohole arrays in gold thin films
Yu Gong, Alan G. Joly, Patrick Z. El-Khoury, Wayne P. Hess
Pacific Northwest National Laboratory (USA) Plasmonic nanohole arrays are unique constructs. Under laser excitation, the incident electric fields can be strongly amplified and spatially guided when resonantly coupled to array plasmon modes. Nanohole arrays can be exploited to manipulate highly localized electric fields on the nanoscale, which has applications in development of plasmonic-assisted photovoltaic devices, optical devices and integrated nano-circuits.
15:15 : Active mid-IR plasmonic metadevices
Xinghui Yin (1),Andreas Tittl (1),Martin Schaferling (1),Ann-Katrin Michel (2),Matthias Wuttig (2),Frank Neubrech (1),Thomas Taubner (2),Harald Giessen (1)
(1)University of Stuttgart (Germany) , (2)RWTH Aachen University (Germany) We present experimental realizations of two active mid-IR plasmonic metadevices that are based on the integration of the phase change material Ge3Sb2Te6: a wavelength tunable, plasmonic perfect absorber with multispectral thermal imaging capability and a wavelength-tunable and handedness-switchable chiral metamaterial.
15:30 : Fano Coil-type Resonances: a Plasmonic Route Towards Magnetic Field Enhancement
Simone Panaro, Adnan Nazir, Remo Proietti Zaccaria, Carlo Liberale, Francesco De Angelis, Andrea Toma
Istituto Italiano di Tecnologia (Italy) The possibility to develop nano-architectures with appreciable magnetic response at optical frequencies has been matter of intense study in the last few years. Here we introduce matrices of nanodisk trimers as a viable platform for the generation of extremely intense and localized magnetic hot-spots. Exploiting the Fano resonance condition, the optical magnetic fields can be squeezed in strongly sub-wavelength regions, opening promising scenarios for spin-wave engineering.
15:45 : SPASER as a complex system: femtosecond dynamics traced by ab-initio simulations
Juan S. Totero Gongora (1),Andrey E. Miroshnichenko (2),Yuri S. Kivshar (2),Andrea Fratalocchi (1)
(1)King Abdullah University of Science and Technology (Saudi Arabia) , (2)Australian National University (Australia) We study the temporal and spatial dynamics of the spaser emission by means of ab-initio simulations at the femtosecond scale. We reveal that the spaser's dynamics demonstrates different operating regimes which range from multipolar pulsed emission to coherent emission with rotational dynamics. These complex dynamics are explained by exploiting a novel quantum-mechanical approach which describes the spaser emission in terms of a dynamically-disordered magnetic system.
16:00 : Engineering the band gap and the indirect-direct gap transition in type I nanostructure superlattice for near infrared detection
Driss Barkissy, Abdelhakim Nafidi, Abderrazak Boutramine, Hicham Charifi, Abdellatif Elanique, Ali Khalal
LCMP Nano Re-University Ibn Zohr (Morocco) We report here electronic bands of GaAs(d1)/AlAs(d2) superlattice near infrared detector performed in the envelope function formalism as a function of the thickness d1, d1/d2, the temperature T and the offset. The transition indirect to direct band gap, of (GaAs)m/(AlAs)4, takes place at m=5. When the offset increases, Eg increases to a maximum and decreases. For each d1, Eg increases with d2/d1. When T and d1 increases, the direct Eg (m=9) of the GaAs(2.52nm)/AlAs(1.16nm) decreases in agreement with literature.
16:15 : Remote Control of Perfect Absorption in Plasmonic Metamaterial with Entangled Photons
C. Altuzarra (1),S. Vezzoli (1),J. Valente (2),W. Gao (1),C. Soci (1),D. Faccio (3),C. Couteau (1),N. Zheludev (1)
(1)Nanyang Technological University (Singapore) , (2)University of Southampton (UK) , (3)Heriot-Watt University (UK) We provide the first experimental demonstration of coherent perfect absorption that can be controlled nonlocally. Recently, we demonstrated coherent absorption of single photons in a deeply subwavelength plasmonic absorber. We showed that while the absorption of photons from a travelling wave is probabilistic, standing wave absorption can be observed deterministically, with nearly unitary probability of coupling a photon into the plasmonic resonant mode of the metamaterial.