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Nonlinear frequency conversion in optical nanoantennas and metasurfaces:materials evolution and fabrication

Opto-Electronic Advances 2018年第10期1卷 1-12页

作者： Mohsen Rahmani Giuseppe Leo Igal Brener Anatoly V. Zayats Stefan A. Maier Costantino De Angelis Hoe Tan Valerio Flavio Gili Fouad Karouta Rupert Oulton Kaushal Vora Mykhaylo Lysevych Isabelle Staude Lei Xu Andrey E. Miroshnichenko Chennupati Jagadish Dragomir N. Neshev Research School of Physics and Engineering The Australian National University Canberra ACT 2601 Australia Matériaux et Phénomènes Quantiques Université Paris Diderot-Sorbonne Paris Cité 10 rue A. Domon et L. Duquet 75013 Paris France Center for Integrated Nanotechnologies Sandia National Laboratories Albuquerque New Mexico 87185 United States Department of Physics King’s College London Strand London WC2R 2LS United Kingdom The Blackett Laboratory Department of Physics Imperial College London London SW7 2AZ United Kingdom Chair in Hybrid Nanosystems Nano Institute Munich Fakultat für Physik Ludwig-Maximilians-Universitat München München Germany Deptartment of Information Engineering Universitàdegli Studi di Brescia and INO-CNR Via Branze 38 25123 Brescia Italy Institute of Applied Physics Abbe Center of Photonics Friedrich Schiller University Jena 07745 Jena Germany School of Engineering and Information Technology University of New South Wales Canberra ACT 2600 Australia

Nonlinear frequency conversion is one of the most fundamental processes in nonlinear *** has a wide range of applications in our daily lives,including novel light sources,sensing,and information *** is usually assumed that nonlinear frequency conversion requires large crystals that gradually accumulate a strong ***,the large size of nonlinear crystals is not compatible with the miniaturisation of modern photonic and optoelectronic ***,shrinking the nonlinear structures down to the nanoscale,while keeping favourable conversion efficiencies,is of great importance for future photonics *** the last decade,researchers have studied the strategies for enhancing the nonlinear efficiencies at the nanoscale,*** employing different nonlinear materials,resonant couplings and hybridization *** this paper,we provide a compact review of the nanomaterials-based efforts,ranging from metal to dielectric and semiconductor nanostructures,including their relevant nanofabrication techniques.

关键词： nonlinear nanophotonics metallic nanoantennas dielectric nanoantennas III-V semiconductor nanoantenna nanofabrication

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Second harmonic generation spectroscopy on hybrid plasmonic/dielectric nanoantennas

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Light(Science & Applications) 2016年第1期5卷 803-809页

作者： Heiko Linnenbank Yevgen Grynko Jens Förstner Stefan Linden Physikalisches Institut Rheinische Friedrich-Wilhelms Universität BonnBonn 53115Germany Department of Electrical Engineering Universität PaderbornPaderborn 33102Germany

Plasmonic nanoantennas provide unprecedented opportunities to concentrate light fields in subwavelength-sized *** placing a nonlinear dielectric nanoparticle in such a hot spot,one can hope to take advantage of both the field enhancement provided by nanoantennas and the large,nonlinear optical susceptibility of dielectric *** test this concept,we combine gold gap nanoantennas with second-order,nonlinear zinc sulfide nanoparticles,and performsecond harmonic generation(SHG)spectroscopy on the combined hybrid dielectric/plasmonic nanoantennas as well as on the individual *** find that SHG from the bare gold nanoantennas,even though it should be forbidden due tosymmetry reasons,is several orders ofmagnitude larger than that of the bare zinc sulfide *** stronger second harmonic signals are generated by the hybrid dielectric/plasmonic *** experiments with nanoantennas containing linear lanthanumfluoride nanoparticles reveal;however,that the increasedSHG efficiency of the hybrid dielectric/plasmonic nanoantennas does not depend on the nonlinear optical susceptibility of the dielectric nanoparticles but is an effect of the modification of the dielectric *** combination of a hybrid dielectric/plasmonic nanoantenna,which is only resonant for the incoming pump light field,with a second nanoantenna,which is resonant for the generated second harmonic light,allows for a further increase in the efficiency of *** the second nanoantenna mediates the coupling of the second harmonic light to the far field,this double-resonant approach also provides us with control over the polarization of the generated light.

关键词： nanoantennas plasmonics second harmonic generation

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Electric Field Enhancement of Nano Gap of Silver Prisms

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Chinese Physics Letters 2007年第10期24卷 2934-2937页

作者： KENZO Yamaguchi TOMOHIRO Inoue MASAMITSU Fujii MASANOBU Haraguchi TOSHIHIRO Okamoto MASUO Fukui SHU Seki SEIICHI Tagawa Department of Optical Science and Engineering Faculty and School of Engineering The University of Tokushima 2-1 Minamijosanjima-cho Tokushima-city Tokushima 770-8506 Japan Department of Electronics and Mechanics Toba National College of Maritime Technology 1-1 Ikegami-cho Toba-city Mie 517-8501 Japan Institute of Scientific and Industrial Research Osaka University 8-1 Mihogaoka Ibaraki Osaka 567-0047 Japan

Using numerical calculation, we examine the effects of gap distance of a pair of nano gap silver prisms with rounded corners on the local light intensity enhancement. Two peaks due to localized surface plasmon （LSP） excitation are observed in a wavelength range from 900nm to 300nm. The results demonstrate that peaks at a longer and a shorter wavelength corresponded to dipole-like and quadrupole-like LSP resonances, respectively. It is found that a gap distance up to 20 nm provides larger light intensity enhancement than that of a single silver nano prism with rounded corners. Furthermore, nano gap silver prisms are fabricated by direct focused ion beam processing, and we measure the scattering light spectrum of a pair of nano prisms by a confocal optical system. However, the two LSP peaks are not observed in visible range because the sizes of the nano gap and prisms are too large.

关键词： SURFACE-PLASMON RESONANCE AG NANOPARTICLES NEAR-FIELD nanoantennas SCATTERING

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Long-lived electron emission reveals localized plasmon modes in disordered nanosponge antennas

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Light(Science & Applications) 2017年第1期6卷 458-465页

作者： Germann Hergert Jan Vogelsang Felix Schwarz Dong Wang Heiko Kollmann Petra Groß Christoph Lienau Erich Runge Peter Schaaf Carl von Ossietzky Universität Institut für PhysikCenter of Interface ScienceD-26129 OldenburgNiedersachsenGermany Technische Universität Ilmenau Institut für Physik and Institut für Mikro-und Nanotechnologien MacroNano®D-98693 IlmenauThüringenGermany Technische Universität Ilmenau Institut für Mikro-und Nanotechnologien MacroNano®and Institut für WerkstofftechnikFachgebiet Werkstoffe der ElektrotechnikD-98693 IlmenauThüringenGermany Forschungszentrum Neurosensorik Carl von Ossietzky UniversitätD-26111 OldenburgNiedersachsenGermany

We report long-lived,highly spatially localized plasmon states on the surface of nanoporous gold nanoparticles—nanosponges—with high excitation *** is well known that disorder on the nanometer scale,particularly in two-dimensional systems,can lead to plasmon localization and large field enhancements,which can,in turn,be used to enhance nonlinear optical effects and to study and exploit quantum optical ***,we introduce promising,three-dimensional model systems for light capture and plasmon localization as gold nanosponges that are formed by the dewetting of gold/silver bilayers and *** study light-induced electron emission from single nanosponges,a nonlinear process with exponents of n≈5...7,using ultrashort laser pulse excitation to achieve femtosecond time *** long-lived electron emission process proves,in combination with optical extinction measurements and finite-difference time-domain calculations,the existence of localized modes with lifetimes of more than 20 *** electrons couple efficiently to the dipole antenna mode of each individual nanosponge,which in turn couples to the ***,individual gold nanosponges are cheap and robust disordered nanoantennas with strong local resonances,and an ensemble of nanosponges constitutes a meta material with a strong polarization independent,nonlinear response over a wide frequency range.

关键词： disorder-induced plasmon localization nanoantennas nanoporous gold nanoparticles ultrafast photoemission spectroscopy

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Nanoplasmonic mid-infrared biosensor for in vitro protein secondary structure detection

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Light(Science & Applications) 2017年第1期6卷 656-665页

作者： Dordaneh Etezadi John B Warner IV Francesco S Ruggeri Giovanni Dietler Hilal A Lashuel Hatice Altug Bionanophotonic Systems Laboratory École Polytechnique Fédérale de Lausanne(EPFL)Lausanne CH-1015Switzerland Laboratory of Molecular Neurobiology and Neuroproteomics EPFLLausanne CH-1015Switzerland Institute of Physics Laboratory of the Physics of Living MatterEPFLLausanne CH-1015Switzerland Department of Chemistry Lensfield roadUniversity of CambridgeCambridge CB21EWUK

Plasmonic nanoantennas offer new applications in mid-infrared(mid-IR)absorption spectroscopy with ultrasensitive detection of structural signatures of biomolecules,such as proteins,due to their strong resonant *** amide I fingerprint of a protein contains conformational information that is greatly important for understanding its function in health and ***,we introduce a non-invasive,label-free mid-IR nanoantenna-array sensor for secondary structure identification of nanometer-thin protein layers in aqueous solution by resolving the content of plasmonically enhanced amide I *** successfully detect random coil to crossβ-sheet conformational changes associated withα-synuclein protein aggregation,a detrimental process in many neurodegenerative ***,our experimental results demonstrate high conformational sensitivity by differentiating subtle secondary-structural variations in a nativeβ-sheet protein monolayer from those of crossβ-sheets,which are characteristic of pathological *** nanoplasmonic biosensor is a highly promising and versatile tool for in vitro structural analysis of thin protein layers.

关键词： label-free biosensing nanoantennas plasmonics protein secondary structure surface-enhanced infrared absorption spectroscopy

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Tailoring magnetic and electric resonances with dielectric nanocubes for broadband and high-efficiency unidirectional scattering

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Chinese Optics Letters 2016年第1期14卷 80-83页

作者：王勇曾翔昊杨二婵鲁拥华张斗国王沛 Department of Optics and Optical Engineering Anhui Key Laboratory of Optoelectronic Science and TechnologyUniversity of Science and Technology of China

The interference of optically induced electric and magnetic resonances in high-refractive-index dielectric nanoparticles provides a new approach to control and shape the scattering patterns of light in the field of nanophotonics. In this Letter, we spectrally tune the electric and magnetic resonances by varying the geometry of a single isolated lead telluride （PbTe） dielectric nanocube. Then, we overlap the electric dipole resonance and magnetic dipole resonance to suppress backward scattering and enhance forward scattering in the resonance region. Furthermore, a broadband unidirectional scattering is achieved by structuring the dielectric nanocuboids as a trimer antenna.

关键词： Magnetic resonance Magnetism nanoantennas Nanomagnetics Refractive index Resonance

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Electromagnetic Analysis of Graphene Nanoparticles Operating in the TeraHertz Band

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Advances in Nanoparticles 2014年第3期3卷 72-76页

作者： Renato Iovine Richard Tarparelli Lucio Vegni Department of Engineering University of Roma Tre Rome Italy

In this work electromagnetic properties of a new type of graphene nanoparticles are investigated. The particles consist of graphene circular and square rings, embedded in a dielectric environment. The electromagnetic behavior in terms of resonant frequency position, magnitude and amplitude width for the absorption cross-section and the near electric field distribution are evaluated. Moreover, the influence of the geometrical parameters is also evaluated. The electromagnetic analysis is derived through proper full-wave numerical simulations. Numerical results show that the nanoparticles can be successfully used for the development of future graphene-based antennas operating in the TeraHertz Band.

关键词： Graphene Nanoparticles nanoantennas Nano-Communications

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