Plasmon–Plasmon Interactions and Radiative Damping of Graphene Plasmons

Semenenko, Vyacheslav; Schuler, Simone; Centeno, Alba; Zurutuza, Amaia; Mueller, Thomas; Perebeinos, Vasili

doi:10.1021/acsphotonics.8b00544

Cited by 19 publications

(11 citation statements)

References 46 publications

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“…For example, it has been recently demonstrated that, at low temperature, monolayer MoSe 2 can achieve high reflection of incident light due to its excitonic resonance. , Additionally, the plasmonic resonances of graphene nanoribbons have been studied. Typically, reflection is not the primary point of interest, as the reflectivity is not particularly strong, with values under 20%. − Related to our work, ref recently observed experimentally radiative rate enhancement in graphene nanoribbon array when the edges of the nanoribbons are brought together. Our work provides a theoretical understanding of this effect and indicates the implication of this effect for reflectivity enhancement.…”

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confidence: 61%

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High Reflection from a One-Dimensional Array of Graphene Nanoribbons

Zhao

Williamson

et al. 2019

ACS Photonics

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We show that up to 90% reflectivity can be achieved by using guided plasmonic resonances in a one-dimensional periodic array of plasmonic nanoribbon. In general, to achieve strong reflection from a guided resonance system requires one to operate in the strongly over-coupled regime where the radiative decay rate dominates over the intrinsic loss rate of the resonances. Using an argument similar to what has been previous used to derive the Chu-Harrington limit for antennas, we show theoretically that there is no intrinsic limit for the radiative decay rate even when the system has an atomic scale thickness, in contrast to the existence of such limits on antennas. We also show that the current distribution due to plasmonic resonance can be designed to achieve very high external radiative rate. Our results show that high reflectivity can be achieved in an atomically-thin graphene layer, pointing to a new opportunity for creating atomically-thin optical devices.Recently there has been significant interest in achieving strong reflection from atomically thin materials, with potential applications in high efficiency optical modulators 1 and for achieving large optomechanical interactions. 2 For this purpose, it is essential to create and utilize various kinds of optical resonances in these materials. For example, it has been recently demonstrated that at low temperature, monolayer MoSe 2 can achieve high reflection of incident light due to its excitonic resonance. 1,3 arXiv:1812.04768v1 [physics.optics]

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confidence: 61%

“…x y y (8) and Maxwell's equations, we can use J x (x) to determine the H y and E x fields of the resonance. Moreover, the structure in Figure 1a is periodic with mirror symmetry about the center of the nanoribbon at x = 0.…”

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confidence: 99%

High Reflection from a One-Dimensional Array of Graphene Nanoribbons

Zhao

Williamson

et al. 2019

ACS Photonics

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Section: Introductionmentioning

confidence: 99%

“…[ 18,19 ] The intrinsic quantum efficiencies of those graphene plasmonic devices are limited by the mismatched plasmonic dissipation rate and its coupling rate to the incident photonic mode. [ 19–21 ] The large plasmon dissipation rate is attributed to hot carrier scattering, dielectric losses to the substrate's phonons, and scattering from edge states or grain boundaries. [ 1,22 ] To suppress the plasmonic dissipation channels, direct etching [ 23–25 ] and atop metal grating [ 12,14,15 ] are replaced by the patterned semiconductor substrates, [ 26 ] and the silicon oxide substrate is replaced by pristine boron nitride to eliminate electron–phonon coupling.…”

Section: Introductionmentioning

confidence: 99%

Graphene Absorption Enhanced by Quasi‐Bound‐State‐in‐Continuum in Long‐Wavelength Plasmonic–Photonic System

Kananen

Wiggins

Wang

et al. 2022

Advanced Optical Materials

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To suppress the plasmonic dissipation channels, direct etching [23][24][25] and atop metal grating [12,14,15] are replaced by the patterned semiconductor substrates, [26] and the silicon oxide substrate is replaced by pristine boron nitride to eliminate electron-phonon coupling. [27][28][29] However, the monolayer graphene plasmon contribution to total absorption remains weak (<10%). [3,15,23,28,30,31] On contrast, near unity absorption by the graphene layer can be achieved near critical coupling within photonic supermodes. [32][33][34][35] Without fine tuning, coupling the guided plasmonic mode to an out-ofplane photonic resonance mode can improve graphene absorption to 25%. [24] At a bound-state-in-the-continuum (BIC), the eigen state of a photonic-plasmonic hybrid mode can be decoupled from the radiative continuum, as the radiative quality factor is not simply constrained by the plasmonic mode scattering loss channels. [36][37][38][39] As the radiative quality factor of the local photonicplasmonic mode rapidly deviates from the BIC condition, a balance between the radiation loss rate and the plasmonic loss rate can be reached, enabling critical coupling. A BIC-improved external quantum efficiency reduces the lasing threshold for both photonic and plasmonic modes, [40,41] and the power threshold for harmonic generation in 2D materials. [42] Plasmonic BICs have been theoretically explored in graphene [43,44] and silver gratings, [45] and experimentally demonstrated with large quality factors (≈145) in asymmetric gold plasmonic metasurface. [46] In this work, a graphene plasmon mode is defined by a micrometer-sized metal antenna array on a flat transparent zinc selenide (ZnSe) substrate. The spacing between the graphene plasmonic layer and the backside metal reflector determines the coupling between the in-plane guided plasmonic mode and the out-of-plane photonic cavity mode, and thus determines the features of the hybrid mode. To quantitatively evaluate the contribution of graphene, comparison of identical designs with and without graphene can provide direct evidence. More than 50% contrast in absorption spectra is observed experimentally in identical designs with and without graphene, compared to numerical simulations resulting in 80% extinction ratio contrast (excluding parasitic scattering loss). The additional layer of graphene leads to 10 3 field enhancement in the plasmonic mode. The results provide direct evidence of BIC-mediated plasmonic devices for efficient light interaction in single layer Graphene plasmonic structures can support enhanced and localized lightmater interactions within extremely small mode volumes. However, the external quantum efficiency of the resulting devices is fundamentally limited by material scattering and radiation loss. Here, such radiation loss channels are suppressed by tailoring the structure to support a symmetry-protected bound-state-in-the-continuum (BIC) system. With practical loss rates and doping level in graphene, over 90% absorption near critical coupling is expect...

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“…[20][21][22] And for graphene metasurface, novel optical properties are dynamically tunable by changing the Fermi energy through voltage control or the changing intrinsic relaxation time through chemical doping. [23][24][25][26] Compared with metallic surface plasmons, graphene surface plasmons have the advantages of low loss, and high localization. 27 Thus, graphene will revolutionize metamaterials and metadevices, and promote the development of nano-optics.…”

Section: Introductionmentioning

confidence: 99%