Transient optical symmetry breaking for ultrafast broadband dichroism in plasmonic metasurfaces

Schirato, Andrea; Maiuri, Margherita; Toma, Andréa; Fugattini, Silvio; Zaccaria, Remo Proietti; Laporta, P.; Nordlander, Peter; Cerullo, Giulio; Alabastri, Alessandro; Valle, Giuseppe Della

doi:10.1038/s41566-020-00702-w

Cited by 62 publications

(103 citation statements)

References 39 publications

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“…Combined with dielectric and ultrathin 2D layer nanomaterials, plasmonic metal nanostructures with extreme small feature size are capable of opening up a new era for planar nanofocusing, ultra-high resolution sensing, ultra-high sensitive detection and energy conversion devices and systems. [179][180][181][182][183][184][185][186][187] Moreover, the advancement in tiny metal nanoholes also promises valuable and promising applications. 188 However, the inherent high loss of metals, high cost and low manufacturing efficiency of traditional nanofabrication techniques are mainly obstacles that restrict the wide and large-scale application of plasmonic metal nanostructures with extreme small feature size.…”

Section: Discussionmentioning

confidence: 99%

Plasmonic metal nanostructures with extremely small features: new effects, fabrication and applications

et al. 2021

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Section: Discussionmentioning

confidence: 99%

Plasmonic metal nanostructures with extremely small features: new effects, fabrication and applications

et al. 2021

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“…This is in line with what recently reported by Nordlander and coworkers, [18] also in collaboration with one of the present authors. [66] Actually, even though individual scattering events occur on a time scale of few femtoseconds the full thermalization requires hundreds of these events and the overall relaxation time of the nonthermal carriers was thus estimated to be of the order of several hundreds of femtoseconds (see Figure 5 ref. [18])).…”

Section: Discussionmentioning

confidence: 99%

Quantitative Ultrafast Electron‐Temperature Dynamics in Photo‐Excited Au Nanoparticles

Sygletou

Benedetti

Ferrera

et al. 2021

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The femtosecond evolution of the electronic temperature of laser‐excited gold nanoparticles is measured, by means of ultrafast time‐resolved photoemission spectroscopy induced by extreme‐ultraviolet radiation pulses. The temperature of the electron gas is deduced by recording and fitting high‐resolution photo emission spectra around the Fermi edge of gold nanoparticles providing a direct, unambiguous picture of the ultrafast electron‐gas dynamics. These results will be instrumental to the refinement of existing models of femtosecond processes in laterally‐confined and bulk condensed‐matter systems, and for understanding more deeply the role of hot electrons in technological applications.

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“…Two dimensional semiconducting transition metal dichalcogenides (TMDCs) have recently attracted considerable interest because of tunable bandgap, tightly bound excitons and highly tunable excitonic properties 1 , enabling applications in various photonic and optoelectronic devices ranging from infrared to visible spectra, such as light emitting diodes 2,3,4 , photodetectors 5,6 , photovoltaics 7 , modulators 8,9 , nanoscale quantum devices 10,11,12 , etc.. To be a light emitter, an important property is the linear polarization, which is highlighted in areas like ultrasensitive sensing, super resolution imaging, medical diagnosis, and optical communications [13][14][15][16][17][18][19][20] . Photoluminescence (PL) of TMDCs is intrinsically linearly polarized under linear excitation, because of the coherent superposition of excitonic states in +/-K valleys at the corners of Brillouin zones.…”

Section: Introductionmentioning

confidence: 99%

Strong Anisotropic Enhancement of Photoluminescence in WS2 Integrated With Plasmonic Nanowire Array

Han

Wang

Zhou

et al. 2020

Preprint

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Layered transition metal dichalcogenides (TMDCs) have shown great potential for a wide range of applications in photonics and optoelectronics. Nevertheless, valley decoherence severely randomizes its polarization which is important to a light emitter. Plasmonic metasurface with a unique way to manipulate the light-matter interaction may provide an effective and practical solution. Here by integrating TMDCs with plasmonic nanowire arrays, we demonstrate strong anisotropic enhancement of the excitonic emission at different spectral positions. For the indirect bandgap transition in bilayer WS2, multifold enhancement can be achieved with the PL polarization either perpendicular or parallel to the long axis of nanowires, which arises from the coupling of WS2 with localized or guided plasmon modes, respectively. Moreover, PL of a high linearity is obtained in the direct bandgap transition benefiting from, in addition to the plasmonic enhancement, the directional diffraction scattering of nanowire arrays. Our method with enhanced PL intensity contrasts to the conventional form-birefringence based on the aspect ratio of nanowire arrays where the intensity loss is remarkable. Our results provide a prototypical plasmon-exciton hybrid system for anisotropic enhancement of the PL at the nanoscale, enabling simultaneous control of intensity, polarization and wavelength toward practical ultrathin photonic devices based on TMDCs.

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Transient optical symmetry breaking for ultrafast broadband dichroism in plasmonic metasurfaces

Cited by 62 publications

References 39 publications

Plasmonic metal nanostructures with extremely small features: new effects, fabrication and applications

Plasmonic metal nanostructures with extremely small features: new effects, fabrication and applications

Quantitative Ultrafast Electron‐Temperature Dynamics in Photo‐Excited Au Nanoparticles

Strong Anisotropic Enhancement of Photoluminescence in WS2 Integrated With Plasmonic Nanowire Array

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