scholarly journals Robust Geometries for Second-Harmonic-Generation in Microrings Exhibiting a 4-Bar Symmetry

2020 ◽  
Vol 10 (24) ◽  
pp. 9047
Author(s):  
Pierre Guillemé ◽  
Chiara Vecchi ◽  
Claudio Castellan ◽  
Stefano Signorini ◽  
Mher Ghulinyan ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Matching Condition ◽  
Second Order ◽  
Phase Matching ◽  
Zinc Blend ◽  
Quasi Phase Matching ◽  
Fabrication Defects ◽  
Phase Matching Condition

Microring resonators made of materials with a zinc-blend or diamond lattice allow exploiting their 4-bar symmetry to achieve quasi-phase matching condition for second-order optical nonlinearities. However, fabrication tolerances impose severe limits on the quasi-phase matching condition, which in turn degrades the generation efficiency. Here, we present a method to mitigate these limitations. As an example, we studied the geometry and the pump wavelength conditions to induce the second-harmonic generation in silicon-based microrings with a second-order susceptibility χzxy(2)≠0. We found the best compromises between performances and experimental requirements, and we unveil a strategy to minimize the impacts of fabrication defects. The method can be easily transferred to other material systems.

Moving media: Second harmonic generation investigation

2016 ◽  
Vol 30 (22) ◽  
pp. 1650138
Author(s):  
Mahboubeh Ghalandari
Keyword(s):  
Electric Field ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Second Order ◽  
Phase Matching ◽  
Nonlinear Media ◽  
Quasi Phase Matching ◽  
Moving Media ◽  
Order Susceptibility

Because of the importance of second harmonic generation (SHG) in some nonlinear media, in this paper, we investigated induced SHG in diamond where there is no intrinsic second-order susceptibility, [Formula: see text]. The electric field is proposed to introduce moving susceptibility of the second-order and induce second harmonic generation. Then, spatiotemporal quasi-phase matching (QPM) is applied to optimize the induced SHG. Numerical results reveal that in this way, the induced second harmonic is found at the frequency of [Formula: see text] rather than [Formula: see text].

scholarly journals Resonance-forbidden second-harmonic generation in nonlinear photonic crystals

Nanophotonics ◽  
2021 ◽  
Vol 0 (0) ◽  
Author(s):  
Jicheng Jin ◽  
Jian Lu ◽  
Bo Zhen
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Second Harmonic ◽  
Finite Size ◽  
Parameter Tuning ◽  
Matching Condition ◽  
Finite Size Effect ◽  
Phase Matching ◽  
Nonlinear Photonic Crystal ◽  
Phase Matching Condition

Abstract Second harmonic generation through nonlinear nano-photonic structures is important in both classical and quantum applications. It is commonly expected that the second harmonic frequency can always be generated as long as appropriate quadratic nonlinearity is provided by the material and the phase-matching condition is satisfied. Here, we present an anomaly to this common wisdom by showing that second-harmonic dipoles generated in a nonlinear photonic crystal slab can be completely nonradiative. As a result, no energy is transferred from the fundamental frequency to the second harmonic even when the phase-matching condition is satisfied – a phenomenon we call “resonance-forbidden second-harmonic generation”. Through numerical simulation, we identify two mechanisms that can achieve this phenomenon: symmetry protection and parameter tuning. The finite-size effect and the topological origin of this phenomenon are also discussed.

scholarly journals Phase-matched nonlinear second-harmonic generation in plasmonic metasurfaces

Nanophotonics ◽  
2019 ◽  
Vol 8 (4) ◽  
pp. 607-612 ◽  
Author(s):  
S. Hamed Shams Mousavi ◽  
Robert Lemasters ◽  
Feng Wang ◽  
Ali Eshaghian Dorche ◽  
Hossein Taheri ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Frequency Conversion ◽  
Second Harmonic ◽  
Matching Condition ◽  
Phase Matching ◽  
Nonlinear Frequency ◽  
Nonlinear Frequency Conversion ◽  
Phase Matching Condition ◽  
Plasmon Modes

AbstractThe phase matching between the propagating fundamental and nonlinearly generated waves plays an important role in the efficiency of the nonlinear frequency conversion in macroscopic crystals. However, in nanoscale samples, such as nanoplasmonic structures, the phase-matching condition is often ignored due to the sub-wavelength nature of the materials. Here, we first show that the phase matching of the lattice plasmon modes at the fundamental and second-harmonic frequencies in a plasmonic nanoantenna array can effectively enhance the surface-enhanced second-harmonic generation. Additionally, a significant enhancement of the second-harmonic generation is demonstrated using stationary band-edge lattice plasmon modes with zero phase.

Continuous wave second-harmonic generation using domain-disordered quasi-phase matching waveguides

2009 ◽  
Vol 94 (15) ◽  
pp. 151107 ◽  
Author(s):  
Sean J. Wagner ◽  
Barry M. Holmes ◽  
Usman Younis ◽  
Amr S. Helmy ◽  
J. Stewart Aitchison ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Continuous Wave ◽  
Second Harmonic ◽  
Phase Matching ◽  
Quasi Phase Matching
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