Search query: Nanoantenna

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abstract: High index dielectric and semiconductor nanoparticles supporting strong electric and magnetic resonances have drawn significant attention in recent years. However, until now, there have been no experimental reports of lasing action from such nanostructures. Here, we demonstrate directional lasing, with a low threshold and high quality factor, in active dielectric nanoantenna arrays achieved through a leaky resonance excited in coupled gallium arsenide (GaAs) nanopillars. The leaky resonance is formed by partially breaking a bound state in the continuum generated by the collective, vertical electric dipole resonances excited in the nanopillars for subdiffractive arrays. We control the directionality of the emitted light while maintaining a high quality factor (Q 2,750) The lasing directivity and wavelength can be tuned via the nanoantenna array geometry and by modifying the gain spectrum of GaAs with temperature. The obtained results provide guidelines for achieving surface emitting laser devices based on active dielectric nanoantennas that are compact and highly transparent.Active dielectric nanoantenna arrays exhibit low threshold and high quality factor directional lasing achieved via a leaky resonance excited in coupled gallium arsenide (GaAs) nanopillars.
author_names: Son Tung Ha

Yuan Hsing Fu

Naresh Kumar Emani

Zhenying Pan

Reuben M Bakker

Ramon Paniagua-Dominguez

Arseniy I Kuznetsov
title: Directional lasing in resonant semiconductor nanoantenna arrays
venue: Nature Nanotechnology
year: 2018

abstract: Optical nanoantennas have shown a great capacity for efficient extraction of photons from the near to the far field, enabling directional emission from nanoscale single photon sources. However, their potential for the generation and extraction of multi photon quantum states remains unexplored. Here we experimentally demonstrate the nanoscale generation of two photon quantum states at telecommunication wavelengths based on spontaneous parametric down conversion in an optical nanoantenna. The antenna is a crystalline AlGaAs nanocylinder, possessing Mie type resonances at both the pump and the bi photon wavelengths, and when excited by a pump beam it generates photon pairs with a rate of 35 Hz. Normalized to the pump energy stored by the nanoantenna, this rate corresponds to 1.4 GHz/Wm, being 1 order of magnitude higher than conventional on chip or bulk photon pair sources. Our experiments open the way for multiplexing several antennas for coherent generation of multi photon quantum states with complex spatial mode entanglement and applications in free space quantum communications and sensing.
author_names: Giuseppe Marino

Alexander S Solntsev

Lei Xu

Valerio Flavio Gili

Luca Carletti

Alexander N Poddubny

Mohsen Rahmani

Daria A Smirnova

Haitao Chen

Aristide Lemaitre

Guoquan Zhang

Anatoly V Zayats

Costantino De Angelis

Giuseppe Leo

Andrey A Sukhorukov

Dragomir N Neshev
title: Spontaneous photon pair generation from a dielectric nanoantenna
venue: Optica
year: 2019

abstract: Dielectric photonics platform provides unique possibilities to control light scattering via utilizing high index dielectric nanoantennas with peculiar optical signatures. Despite the intensively growing field of all dielectric nanophotonics, it is still unclear how surrounding media affect scattering properties of a nanoantenna with complex multipole response. Here, we report on light scattering by a silicon cubic nanoparticle embedded in lossless media, supporting optical resonant response. We show that significant changes in the scattering process are governed by the electro magnetic multipole resonances, which experience spectral red shift and broadening over the whole visible and near infrared spectra as the indices of media increase. Most interestingly, the considered nanoantenna exhibits the broadband forward scattering in the visible and near infrared spectral ranges due to the Kerker effect in high index media. The revealed effect of broadband forward scattering is essential for highly demanding applications in which the influence of the media is crucial such as health care, e.g. sensing, treatment efficiency monitoring, and diagnostics. In addition, the insights from this study are expected to pave the way toward engineering the nanophotonic systems including but not limited to Huygens metasurfaces in media within a single framework.
author_names: Pavel D Terekhov

Hadi K Shamkhi

Egor A Gurvitz

Kseniia V Baryshnikova

Andrey B Evlyukhin

Alexander S Shalin

Alina Karabchevsky
title: Broadband forward scattering from dielectric cubic nanoantenna in lossless media.
venue: Optics express
year: 2019

abstract: Nonlinear plasmons are becoming an appealing and intriguing research area due to their remarkable light concentration and manipulation abilities. In this work, the nonlinear absorption (NLA) phenomena of polarized nanoantenna arrays coupled with the low dimensional topological insulator Bi2Se3 are studied at different excitation wavelengths. Our experimental results indicate that a significant enhancement in the linear absorption coefficient is achieved by localized surface plasmon (LSP) resonance, with enhancement factors that are 10 and 8 fold in magnitude for the cases of 800 nm (y polarization) and 970 nm (x polarization) respectively. Moreover, by polarization sensitive studies under 800 nm laser excitation, this new Bi2Se3 Au nanoantenna hybrid structure exhibits adverse absorption responses of enhancement and suppression compared to pure Bi2Se3 film, providing excellent potential for applications in information converters. In particular, under 800 nm pump light (10 GW cm 2) the transmittance intensity of 450 nm or 1064 nm continuous wave (CW) probe light alters back and forth when the polarization direction changes by 90deg. Thus, "ON" and "OFF" modes of this Bi2Se3 Au nanoantenna hybrid structure based switch are achieved by using 450 nm and 1064 nm light, respectively, with a corresponding modulation depth of 3.4% and 21.9% which can be applied in versatile photonic devices.
author_names: Runlin Miao

Yuze Hu

Hao Ouyang

Yuxiang Tang

Chenxi Zhang

Jie You

Xin Zheng

Zhongjie Xu

Xiang'ai Cheng

Tian Jiang
title: A polarized nonlinear optical response in a topological insulator Bi2Se3 Au nanoantenna hybrid structure for all optical switching.
venue: Nanoscale
year: 2019

abstract: Formation of dressed light matter states in optical structures, manifested as Rabi splitting of the eigen energies of a coupled system, is one of the key effects in quantum optics. In pursuing this regime with semiconductors, light is usually made to interact with excitons, electrically neutral quasiparticles of semiconductors; meanwhile interactions with charged three particle states, trions, have received little attention. Here, we report on strong interaction between localized surface plasmons in silver nanoprisms and excitons and trions in monolayer tungsten disulfide (WS2) We show that the plasmon exciton interactions in this system can be efficiently tuned by controlling the charged versus neutral exciton contribution to the coupling process. In particular, we show that a stable trion state emerges and couples efficiently to the plasmon resonance at low temperature by forming three bright intermixed plasmon exciton trion polariton states. Our findings open up a possibility to exploit electrically charged polaritons at the single nanoparticle level.
author_names: Jorge Cuadra

Denis G Baranov

Martin Wersall

Ruggero Verre

Tomasz J Antosiewicz

Timur O Shegai
title: Observation of Tunable Charged Exciton Polaritons in Hybrid Monolayer WS2 Plasmonic Nanoantenna System.
venue: Nano letters
year: 2018

abstract: In the context of using portions of a photosynthetic apparatus of green plants and photosynthesizing bacteria in bioinspired photovoltaic systems, we consider possible control of the chlorophyll excited state decay rate using nanoantennas in the form of a single metal and semiconductor nanoparticle. Since chlorophyll luminescence competes with electron delivery for chemical reactions chain and also to an external circuit, we examine possible excited state decay inhibition contrary to radiative rate enhancement. Both metal and semiconductor nanoparticles enable inhibition of radiative decay rate by one order of the magnitude as compared to that in vacuum, whereas a metal nanosphere cannot perform the overall decay inhibition since slowing down of radiative decay occurs only along with the similar growth of its nonradiative counterpart whereas a semiconductor nanoantenna is lossless. Additionally, at normal orientation of the emitter dipole moment to a nanoparticle surface, a silicon nanoparticle promotes enhancement of radiative decay by one order of the magnitude within the whole visible range. Our results can be used for other photochemical or photovoltaic processes, and strong radiative decay enhancement found for dielectric nanoantennas paves the way to radiative decays and light emitters engineering without non radiative losses.
author_names: Sergey V Gaponenko

Pierre-Michel Adam

Dmitry V Guzatov

Alina Muravitskaya
title: Possible nanoantenna control of chlorophyll dynamics for bioinspired photovoltaics
venue: Scientific Reports
year: 2019

abstract: Abstract Owing to unique electronic and plasmonic properties at terahertz (THz) band, two dimensional nano material graphene make it easy for the design of highly miniaturized ultra wideband (UWB) reconfigurable THz antenna with simple nano structure at subwavelength scale. In this paper, a sub wavelength miniaturized UWB reconfigurable graphene circular patch nanoantenna at THz band is reported. The simple structured graphene circular patch nanoantenna provides ultra wideband of impedance bandwidth of 370% The propagation of SPP waves in graphene THz antenna enables high miniaturization at THz band. At resonant frequency 0.75 THz, SPP wavelength lSPP of the antenna is 10 times smaller than free space wavelength l0. Broad side radiation pattern with lower back lobe radiation is found at resonant frequency of the antenna. Moreover, frequency reconfiguration in the antenna is easily achievable by applying external voltage via Fermi energy of graphene. For a comparison propose, copper circular patch nanoantenna of the same dimension has been modelled in this work. Copper circular patch nanoantenna resonates at higher frequency 1.15 THz and provides a very narrow bandwidth. Compared to conventional copper metal antenna, graphene nanoantenna enables high miniaturization, UWB behavior, and easy reconfiguration. The proposed graphene nanoantenna can be promising for UWB THz applications.
author_names: Sasmita Dash

Amalendu Patnaik
title: Sub wavelength Graphene Planar nanoantenna for THz Application
year: 2019

abstract: Strong coupling of an intersubband (ISB) electron transition in quantum wells to a subwavelength plasmonic nanoantenna can give rise to intriguing quantum phenomena, such as ISB polariton condensation, and enable practical devices including low threshold lasers. However, experimental observation of ISB polaritons in an isolated subwavelength system has not yet been reported. Here, we use scanning probe near field microscopy and Fourier transform infrared (FTIR) spectroscopy to detect formation of ISB polariton states in a single nanoantenna. We excite the nanoantenna by a broadband IR pulse and spectrally analyze evanescent fields on the nanoantenna surface. We observe the distinctive splitting of the nanoantenna resonance peak into two polariton modes and two p phase steps corresponding to each of the modes. We map ISB polariton dispersion using a set of nanoantennae of different sizes. This nano FTIR spectroscopy approach opens doors for investigations of ISB polariton physics in the single subwavelength nanoantenna regime.
author_names: Chih-Feng Wang

Terefe G Habteyes

Ting S Luk

John F Klem

Igal Brener

Hou-Tong Chen

Oleg Mitrofanov
title: Observation of Intersubband Polaritons in a Single Nanoantenna Using Nano FTIR Spectroscopy.
venue: Nano letters
year: 2019

abstract: We study light emission from square arrays of Mie resonant silicon nanoantennas situated on a fluorescent glass substrate. When the spectral positions of the silicon nanoantennas' resonances overlap with the intrinsic emission from the glass, the emission is selectively enhanced for certain spectral and spatial frequencies detemined by the design of the nanoantenna array. We measure the emission spectra of the coupled system for a systematic variation of the nanoantenna geometry, showing that the spectral maximum of the emission coincides with the antenna resonance positions observed in linear optical transmittance spectra. Furthermore, we study the directionality of the emission by back focal plane imaging and numerical calculations based on the Fourier modal method and the reciprocity principle. We observe that the nanoantenna array induces a reshaping of the resonantly enhanced emission in the air half space into a narrow lobe directed out of the substrate plane. This reshaping is explained by coherent.
author_names: Aleksandr Vaskin

Justus Bohn

Katie E Chong

Tobias Bucher

Matthias Zilk

Duk-Yong Choi

Dragomir N Neshev

Yuri S Kivshar

Thomas Pertsch

Isabelle Staude
title: Directional and Spectral Shaping of Light Emission with Mie Resonant Silicon Nanoantenna Arrays
year: 2018

abstract: High refractive index (HRI) nanostructures support optically induced electric dipole (ED) and magnetic dipole (MD) modes that can be used to control scattering and achieve narrowband absorption. In this work, a high absorptance device is proposed and realized by using amorphous silicon nanoantenna (a Si NA) arrays that suppress backward and forward scattering with engineered structures and in particular periods. The overlap of ED and MD resonances, by designing an array with a specific period and exciting lattice resonances, is experimentally demonstrated. The absorptance of a Si NA arrays increases 3 fold in the near infrared range in comparison to unpatterned silicon films. Nonradiating a Si NA arrays can achieve high absorptance with a small resonance bandwidth (Q 11.89) at a wavelength of 785 nm. The effect is observed not only due to the intrinsic loss of material but by overlapping the ED and MD resonances.
author_names: Chi-Yin Yang

Jhen-Hong Yang

Zih-Ying Yang

Zhong-Xing Zhou

Mao-Guo Sun

Viktoriia E Babicheva

Kuo-Ping Chen
title: Nonradiating Silicon Nanoantenna Metasurfaces as Narrowband Absorbers
year: 2018