Electrical control of second harmonic generation in a graphene-based plasmonic Fano structure

Xiao, Fajun; Zhu, Weiren; Shang, Wuyun; Mei, Ting; Premaratne, Malin; Zhao, Jianlin

doi:10.1364/oe.23.003236

Cited by 25 publications

(18 citation statements)

References 40 publications

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“…34 Hybrid metamaterial based devices can generate a tunable PIT response that can be used for enhanced sensing and switchable camouflage systems. 29,[35][36][37] These devices operate in the transmission mode and require a transparent substrate that limits the design wavelengths based on the type of substrate being used. [11][12][13]34 On the other hand, the light matter interaction of graphene on top of the reflecting surface is increased fourfold.…”

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confidence: 99%

Electrically controllable plasmon induced reflectance in hybrid metamaterials

Habib

Gokbayrak

Özbay

et al. 2018

Applied Physics Letters

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The tunable plasmon induced reflectance (PIR) effect has been numerically investigated and experimentally realized by hybrid metal-graphene metamaterials. The PIR effect is produced by two parallel strips of gold (Au) and controlled electrically by applying the gate voltage to the graphene layer. The PIR response is generated by the weak hybridization of two bright modes of the gold strips and tuned by changing the Fermi level (Ef) of the graphene. The total shift of 211.7 nm was achieved in the reflection peak by applying only 3 V. This concept of real time electrical tuning of PIR, with a modulation depth of ∼49% and a spectral contrast ratio of 66.6%, can be used for designing optical switches, optical modulators, and tunable sensors.

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confidence: 99%

Electrically controllable plasmon induced reflectance in hybrid metamaterials

Habib

Gokbayrak

Özbay

et al. 2018

Applied Physics Letters

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“…After substituting x 1(2) to Eq. (3), expressions for C 1(2) can be analytically derived [38]. Then, α (ω) = I 0 + |C 1 (ω) + C 2 (ω)| 2 with I 0 to account for the background is used to fit the scattering spectrum of the plasmonic dual-hexamers as shown the black solid line in Fig.…”

Section: Resultsmentioning

confidence: 99%

Radial breathing modes coupling in plasmonic molecules

et al. 2019

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Metallic hexamer, very much the plasmonic analog of benzene molecule, provides an ideal platform to mimic modes coupling and hybridization in molecular systems. To demonstrate this, we present a detailed study on radial breathing mode (RBM) coupling in a plasmonic dual-hexamers. We excite RBMs of hexamers by symmetrically matching the polarization state of the illumination with the distribution of electric dipole moments of the dual-hexamer. It is found that the RBM coupling exhibits a nonexponential decay when the inter-hexamer separation is increased, owing to the dark mode nature of RBM. When the outer hexamer is subjected to the in-plane twisting, resonant wavelengths of two coupled RBMs as well as the coupling constant show cosine variations with the twist angle, indicating the symmetry of hexamer structure plays a critical role in the coupling of RBMs. Moreover, it is demonstrated that the coupling of RBMs is dominated by the in-plane interaction as the outer hexamer is under an out-of-plane tilting, causing convergence of resonant wavelengths of the two coupled RBMs with increasing tilt angle. Our results not only provide an insight into the plasmonic RBM coupling mechanism, but also pave the way to systematically control the spectral response of plasmonic molecules.

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“…The two oscillators provide the anti-bonding and bonding modes, which are characterized by the resonance frequencies ω a , ω b , nonradiative damping efficiencies γ a , γ b and radiation coupling efficiencies η a , η b . The equation governing the motions of the two oscillators can be written as 26, 44 where g denotes the coupling constant between the two oscillators and E = E 0 e i ωt represents the electric field of the excitation beam. At steady state, the motions of two oscillators are harmonics with forms of x a , b = C a , b e i ωt , where C a , b can be derived asThe scattering coefficient of the system can be described by σ sca = I 0 + | C a + C b | 2 with I 0 accounting for the background, which is used to fit the scattering spectra excited by LPB and APB with the same excitation power over the structure.…”

Section: Resultsmentioning

confidence: 99%

“…So far, Fano resonances have been extensively studied in various plasmonic nanostructures, including dolmen 8, 9 , metallic nanoclusters 10–12 , ring/disk and ring/crescent-ring cavities 13, 14 , core-shell nanostructures 15–17 and split-ring resonators (SRRs) 18–22 . Owing to plasmonic Fano resonances exhibit pronounced asymmetric spectral lineshapes and highly enhanced local fields, they can be effectively exploited for applications ranging from chemical and biological sensors 23, 24 , to surface enhanced Raman spectroscopy (SERS) 3, 5 and nonlinear optics 25, 26 .…”

Section: Introductionmentioning

confidence: 99%

Fano resonance with high local field enhancement under azimuthally polarized excitation

Shang

Xiao

Zhu

et al. 2017

Sci Rep

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Being an enabling technology for applications such as ultrasensitive biosensing and surface enhanced spectroscopy, enormous research interests have been focused on further boosting the local field enhancement at Fano resonance. Here, we demonstrate a plasmonic Fano resonance resulting from the interference between a narrow magnetic dipole mode and a broad electric dipole mode in a split-ring resonator (SRR) coupled to a nanoarc structure. Strikingly, when subjected to an azimuthally polarized beam (APB) excitation, the intensity enhancement becomes more than 60 times larger than that for a linearly polarized beam (LPB). We attribute this intensity enhancement to the improved conversion efficiency between the excitation and magnetic dipole mode along with improved near-field coupling. The APB excited Fano structure is further used as a nanoruler and beam misalignment sensor, due to the high sensitivity of intensity enhancement and scattering spectra to structure irregularities and excitation beam misalignment. Interestingly, we find that, regardless of the presence of structural translations, the proposed structure still maintains over 60 times better intensity enhancement under APB excitation compared to LPB excitation. Moreover, even if the APB excitation is somewhat misaligned, our Fano structure still manages to give a larger intensity enhancement than its counterpart excited by LPB.

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Electrical control of second harmonic generation in a graphene-based plasmonic Fano structure

Cited by 25 publications

References 40 publications

Electrically controllable plasmon induced reflectance in hybrid metamaterials

Electrically controllable plasmon induced reflectance in hybrid metamaterials

Radial breathing modes coupling in plasmonic molecules

Fano resonance with high local field enhancement under azimuthally polarized excitation

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