scholarly journals Enhanced second-harmonic generation in monolayer MoS2 on suspended metallic nanostructures by plasmonic resonances

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Qing Leng ◽  
Huanhuan Su ◽  
Jianqiang Liu ◽  
Lin Zhou ◽  
Kang Qin ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Transition Metal Dichalcogenides ◽  
Hybrid Structure ◽  
Plasmonic Nanostructures ◽  
Field Amplification ◽  
Optical Effects ◽  
Metal Dichalcogenides ◽  
Symmetric Surface

Abstract Monolayer transition metal dichalcogenides (TMDs) possess large second-order nonlinear responses due to the broken inversion symmetry, which can extend their intriguing applications in nonlinear nanophotonics and optoelectronics. However, the atomic thickness of monolayer TMDs severely decreases the interaction length with free light with respect to bulk materials, leading to rather low second-harmonic generation (SHG) conversion efficiency. Here, we demonstrate a hybrid structure consisting of a monolayer MoS2 on a suspended perforated silver film, on which the SHG signal emitted from the monolayer MoS2 is enhanced by more than three orders of magnitude at room temperature. The pronounced SHG enhancement is attributed to the distinct electric field amplification nearby the nanoholes, which is induced by the symmetric surface plasmon polaritons (SPPs) existing in the ultrathin suspended silver grating. Our results reported here may establish the substrate-free engineering of nonlinear optical effects via plasmonic nanostructures on demand.

scholarly journals Twist Angle mapping in layered WS2 by Polarization-Resolved Second Harmonic Generation

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Sotiris Psilodimitrakopoulos ◽  
Leonidas Mouchliadis ◽  
Ioannis Paradisanos ◽  
George Kourmoulakis ◽  
Andreas Lemonis ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Twist Angle ◽  
Transition Metal Dichalcogenides ◽  
Large Area ◽  
Metal Dichalcogenides ◽  
The Individual ◽  
Pixel Mapping

Abstract Stacked atomically thin transition metal dichalcogenides (TMDs) exhibit fundamentally new physical properties compared to those of the individual layers. The twist angle between the layers plays a crucial role in tuning these properties. Having a tool that provides high-resolution, large area mapping of the twist angle, would be of great importance in the characterization of such 2D structures. Here we use polarization-resolved second harmonic generation (P-SHG) imaging microscopy to rapidly map the twist angle in large areas of overlapping WS2 stacked layers. The robustness of our methodology lies in the combination of both intensity and polarization measurements of SHG in the overlapping region. This allows the accurate measurement and consequent pixel-by-pixel mapping of the twist angle in this area. For the specific case of 30° twist angle, P-SHG enables imaging of individual layers.

scholarly journals Light-induced symmetry breaking for enhancing second-harmonic generation from an ultrathin plasmonic nanocavity

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Guang-Can Li ◽  
Dangyuan Lei ◽  
Meng Qiu ◽  
Wei Jin ◽  
Sheng Lan ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Noble Metals ◽  
Second Harmonic ◽  
Near Field ◽  
Field Enhancement ◽  
Plasmonic Nanostructures ◽  
Far Field ◽  
Field Amplification ◽  
Gold Nanosphere

AbstractEfficient frequency up-conversion of coherent light at the nanoscale is highly demanded for a variety of modern photonic applications, but it remains challenging in nanophotonics. Surface second-order nonlinearity of noble metals can be significantly boosted up by plasmon-induced field enhancement, however the related far-field second-harmonic generation (SHG) may also be quenched in highly symmetric plasmonic nanostructures despite huge near-field amplification. Here, we demonstrate that the SHG from a single gold nanosphere is significantly enhanced when tightly coupled to a metal film, even in the absence of a plasmon resonance at the SH frequency. The light-induced electromagnetic asymmetry in the nanogap junction efficiently suppresses the cancelling of locally generated SHG fields and the SH emission is further amplified through preferential coupling to the bright, bonding dipolar resonance mode of the nanocavity. The far-field SHG conversion efficiency of up to $$3.56\times 10^{-7}$$ 3.56 × 1 0 − 7 W−1 is demonstrated from a single gold nanosphere of 100 nm diameter, two orders of magnitude higher than for complex double-resonant plasmonic nanostructures. Such highly efficient SHG from a metal nanocavity also constitutes an ultrasensitive nonlinear nanoprobe to map the distribution of longitudinal vectorial light fields in nanophotonic systems.

Edge effects in second-harmonic generation in nanoscale layers of transition-metal dichalcogenides

2015 ◽  
Vol 49 (6) ◽  
pp. 791-796 ◽  
Author(s):  
E. D. Mishina ◽  
N. E. Sherstyuk ◽  
A. P. Shestakova ◽  
S. D. Lavrov ◽  
S. V. Semin ◽  
...  
Keyword(s):  
Transition Metal ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Edge Effects ◽  
Second Harmonic ◽  
Transition Metal Dichalcogenides ◽  
Metal Dichalcogenides

Second harmonic generation in two-dimensional transition metal dichalcogenides with growth and post-synthesis defects

2D Materials ◽  
2020 ◽  
Vol 7 (4) ◽  
pp. 045020
Author(s):  
William Murray ◽  
Michael Lucking ◽  
Ethan Kahn ◽  
Tianyi Zhang ◽  
Kazunori Fujisawa ◽  
...  
Keyword(s):  
Transition Metal ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Transition Metal Dichalcogenides ◽  
Two Dimensional ◽  
Metal Dichalcogenides ◽  
Post Synthesis

scholarly journals Imaging the crystal orientation of 2D transition metal dichalcogenides using polarization-resolved second-harmonic generation

2019 ◽  
Vol 2 (11) ◽  
pp. 19002601-19002608 ◽  
Author(s):  
George Miltos Maragkakis ◽  
◽  
Sotiris Psilodimitrakopoulos ◽  
Leonidas Mouchliadis ◽  
Ioannis Paradisanos ◽  
...  
Keyword(s):  
Transition Metal ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Crystal Orientation ◽  
Second Harmonic ◽  
Transition Metal Dichalcogenides ◽  
Metal Dichalcogenides

scholarly journals Second-harmonic generation enhancement in monolayer transition-metal dichalcogenides by using an epsilon-near-zero substrate

2021 ◽  
Vol 3 (1) ◽  
pp. 272-278
Author(s):  
Pilar G. Vianna ◽  
Aline dos S. Almeida ◽  
Rodrigo M. Gerosa ◽  
Dario A. Bahamon ◽  
Christiano J. S. de Matos
Keyword(s):  
Dielectric Constant ◽  
Transition Metal ◽  
Harmonic Generation ◽  
Nonlinear Effect ◽  
Second Harmonic ◽  
2D Materials ◽  
Transition Metal Dichalcogenides ◽  
Transition Metal Dichalcogenide ◽  
Metal Dichalcogenides ◽  
Epsilon Near Zero

The scheme illustrates a monolayer transition-metal dichalcogenide on an epsilon-near-zero substrate. The substrate near-zero dielectric constant is used as the enhancement mechanism to maximize the SHG nonlinear effect on monolayer 2D materials.

scholarly journals Optical characterisation of plasmonic nanostructures on planar substrates using second–harmonic generation

2015 ◽  
Vol 23 (20) ◽  
pp. 26486 ◽  
Author(s):  
Lina Persechini ◽  
Ruggero Verre ◽  
Christopher M. Smith ◽  
Karsten Fleischer ◽  
Igor V. Shvets ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Plasmonic Nanostructures ◽  
Planar Substrates
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