Photonic–Plasmonic Coupling of GaAs Single Nanowires to Optical Nanoantennas

Casadei, Alberto; Pecora, Emanuele Francesco; Trevino, Jacob; Forestiere, Carlo; Rüffer, Daniel; Russo-Averchi, Eleonora; Matteini, Federico; Tütüncüoǧlu, Gözde; Heiß, Martin; Morral, Anna Fontcuberta i; Negro, Luca Dal

doi:10.1021/nl404253x

Cited by 78 publications

(62 citation statements)

References 46 publications

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“…The research on core-shell nanowires was triggered by the possibility they show for the optimization of solar cells [21][22][23][24][25][26] and antennas [27][28][29]. Other interesting applications are lasers [30][31][32][33] and light emitting diodes [6,34,35].…”

Section: Introductionmentioning

confidence: 99%

Excitons in Core–Shell Nanowires with Polygonal Cross Sections

et al. 2018

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The distinctive prismatic geometry of semiconductor core-shell nanowires leads to complex localization patterns of carriers. Here, we describe the formation of optically active in-gap excitonic states induced by the interplay between localization of carriers in the corners and their mutual Coulomb interaction. To compute the energy spectra and configurations of excitons created in the conductive shell, we use a multi-electron numerical approach based on the exact solution of the multi-particle Hamiltonian for electrons in the valence and conduction bands, which includes the Coulomb interaction in a nonperturbative manner. We expose the formation of well separated quasidegenerate levels, and focus on the implications of the electron localization in the corners or on the sides of triangular, square and hexagonal cross sections. We obtain excitonic in-gap states associated with symmetrically distributed electrons in the spin singlet configuration. They acquire large contributions due to Coulomb interaction, and thus are shifted to much higher energies than other states corresponding to the conduction electron and the vacancy localized in the same corner. We compare the results of the multi-electron method with those of an electron-hole model and we show that the latter does not reproduce the singlet excitonic states. We also obtain the exciton lifetime and explain selection rules which govern the recombination process.

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Section: Introductionmentioning

confidence: 99%

Excitons in Core–Shell Nanowires with Polygonal Cross Sections

et al. 2018

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“…The nanowire geometry is particularly interesting as it allows for excellent charge collective extraction and a large optical cross section 4 . By controlling the dimension and morphology, NWs can be synthesized to support distinct dielectric resonances with low optical loss, enabling the manipulation of the optical properties at the deep subwavelength-scale 5, 6 . Meanwhile, various metallic nanostructures have shown unparalleled ability to modify the light response of nanoscale objects through a plasmonic resonant coupling between excitation and metal structures 7 .…”

Section: Introductionmentioning

confidence: 99%

Extreme absorption enhancement in ZnTe:O/ZnO intermediate band core-shell nanowires by interplay of dielectric resonance and plasmonic bowtie nanoantennas

Nie

Chen

et al. 2017

Sci Rep

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Intermediate band solar cells (IBSCs) are conceptual and promising for next generation high efficiency photovoltaic devices, whereas, IB impact on the cell performance is still marginal due to the weak absorption of IB states. Here a rational design of a hybrid structure composed of ZnTe:O/ZnO core-shell nanowires (NWs) with Al bowtie nanoantennas is demonstrated to exhibit strong ability in tuning and enhancing broadband light response. The optimized nanowire dimensions enable absorption enhancement by engineering leaky-mode dielectric resonances. It maximizes the overlap of the absorption spectrum and the optical transitions in ZnTe:O intermediate-band (IB) photovoltaic materials, as verified by the enhanced photoresponse especially for IB states in an individual nanowire device. Furthermore, by integrating Al bowtie antennas, the enhanced exciton-plasmon coupling enables the notable improvement in the absorption of ZnTe:O/ZnO core-shell single NW, which was demonstrated by the profound enhancement of photoluminescence and resonant Raman scattering. The marriage of dielectric and metallic resonance effects in subwavelength-scale nanowires opens up new avenues for overcoming the poor absorption of sub-gap photons by IB states in ZnTe:O to achieve high-efficiency IBSCs.

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“…Additionally, due to the high luminous efficiency, the light emitted from the CdS nanoribbon can be directly guided in the ribbon, which makes the waveguide avoid the light coupling. Utilizing the strong electromagnetic coupling between the optical waveguide in the 1D semiconductor nanostructures and low dimensional noble metal nanostructures to induce SPs can give rise to abundant optical properties and even create a new path to invent better-performance optical elements [42][43][44][45]. Here, we designed and fabricated a novel sandwich-like hybrid nanostructure for the first time, which composed by Au nanodisks array covering on a CdS nanoribbon, with a thin HfO 2 film as the intermediate dielectric layer.…”

Section: Introductionmentioning

confidence: 99%

Optical waveguide beam splitters based on hybrid metal–dielectric–semiconductor nanostructures

Liang

Zhou

et al. 2015

Optics Communications

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Optical waveguide beam splitter Surface plasmons Interference Light spot Numerical simulation a b s t r a c t Miniature integration is desirable for the future photonics circuit. Low-dimensional semiconductor and metal nanostructures is the potential building blocks in compact photonic circuits for their unique electronic and optical properties. In this work, a hybrid metal-dielectric-semiconductor nanostructure is designed and fabricated to realizing a nano-scale optical waveguide beam splitter, which is constructed with the sandwiched structure of a single CdS nanoribbon/HfO 2 thin film/Au nanodisk arrays. Microoptical investigations reveal that the guided light outputting at the terminal end of the CdS ribbon is well separated into several light spots. Numerical simulations further demonstrate that the beam splitting mechanism is attributed to the strong electromagnetic coupling between the Au nanodisks and light guided in the nanoribbon. The number of the split beams (light spots) at the terminal end of the nanoribbon is mainly determined by the number of the Au nanodisk rows, as well as the distance of the blank region between the nanodisks array and the end of the CdS ribbon, owing to the interference between the split beams. These optical beam splitters may find potential applications in high-density integrated photonic circuits and systems.

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Photonic–Plasmonic Coupling of GaAs Single Nanowires to Optical Nanoantennas

Cited by 78 publications

References 46 publications

Excitons in Core–Shell Nanowires with Polygonal Cross Sections

Excitons in Core–Shell Nanowires with Polygonal Cross Sections

Extreme absorption enhancement in ZnTe:O/ZnO intermediate band core-shell nanowires by interplay of dielectric resonance and plasmonic bowtie nanoantennas

Optical waveguide beam splitters based on hybrid metal–dielectric–semiconductor nanostructures

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