scholarly journals Enhanced tunable second harmonic generation from twistable interfaces and vertical superlattices in boron nitride homostructures

2021 ◽  
Vol 7 (10) ◽  
pp. eabe8691
Author(s):  
Kaiyuan Yao ◽  
Nathan R. Finney ◽  
Jin Zhang ◽  
Samuel L. Moore ◽  
Lede Xian ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Frequency Conversion ◽  
Hexagonal Boron Nitride ◽  
Second Harmonic ◽  
Complete Control ◽  
Broken Symmetries ◽  
Superlattice Structures ◽  
Tunable Frequency

Broken symmetries induce strong even-order nonlinear optical responses in materials and at interfaces. Unlike conventional covalently bonded nonlinear crystals, van der Waals (vdW) heterostructures feature layers that can be stacked at arbitrary angles, giving complete control over the presence or lack of inversion symmetry at a crystal interface. Here, we report highly tunable second harmonic generation (SHG) from nanomechanically rotatable stacks of bulk hexagonal boron nitride (BN) crystals and introduce the term twistoptics to describe studies of optical properties in twistable vdW systems. By suppressing residual bulk effects, we observe SHG intensity modulated by a factor of more than 50, and polarization patterns determined by moiré interface symmetry. Last, we demonstrate greatly enhanced conversion efficiency in vdW vertical superlattice structures with multiple symmetry-broken interfaces. Our study paves the way for compact twistoptics architectures aimed at efficient tunable frequency conversion and demonstrates SHG as a robust probe of buried vdW interfaces.

Second harmonic generation from multilayer hexagonal boron nitride

2019 ◽  
Author(s):  
Sejeong Kim ◽  
Johannes E. Fröch ◽  
Augustine Gardner ◽  
Chi Li ◽  
Igor Aharonovich ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Hexagonal Boron Nitride ◽  
Second Harmonic

scholarly journals Second harmonic generation in defective hexagonal boron nitride

2020 ◽  
Vol 32 (19) ◽  
pp. 19LT01 ◽  
Author(s):  
Renan Cunha ◽  
Alisson Cadore ◽  
Sérgio L L M Ramos ◽  
Kenji Watanabe ◽  
Takashi Taniguchi ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Hexagonal Boron Nitride ◽  
Second Harmonic

scholarly journals Second-harmonic generation in multilayer hexagonal boron nitride flakes

2019 ◽  
Vol 44 (23) ◽  
pp. 5792 ◽  
Author(s):  
Sejeong Kim ◽  
Johannes E. Fröch ◽  
Augustine Gardner ◽  
Chi Li ◽  
Igor Aharonovich ◽  
...  
Keyword(s):  
Boron Nitride ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Hexagonal Boron Nitride ◽  
Second Harmonic

scholarly journals Giant Second Harmonic Generation Enhancement by Ag Nanoparticles Compactly Distributed on Hexagonal Arrangements

Nanomaterials ◽  
2021 ◽  
Vol 11 (9) ◽  
pp. 2394
Author(s):  
Alejandro Gómez-Tornero ◽  
Luisa E. Bausá ◽  
Mariola O. Ramírez
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Frequency Conversion ◽  
Near Infrared ◽  
Second Harmonic ◽  
Field Enhancement ◽  
Infrared Region ◽  
Plasmonic Nanostructures ◽  
Harmonic Intensity ◽  
Dielectric Interfaces

The association of plasmonic nanostructures with nonlinear dielectric systems has been shown to provide useful platforms for boosting frequency conversion processes at metal-dielectric interfaces. Here, we report on an efficient route for engineering light–matter interaction processes in hybrid plasmonic-χ(2) dielectric systems to enhance second harmonic generation (SHG) processes confined in small spatial regions. By means of ferroelectric lithography, we have fabricated scalable micrometric arrangements of interacting silver nanoparticles compactly distributed on hexagonal regions. The fabricated polygonal microstructures support both localized and extended plasmonic modes, providing large spatial regions of field enhancement at the optical frequencies involved in the SHG process. We experimentally demonstrate that the resonant excitation of the plasmonic modes supported by the Ag nanoparticle-filled hexagons in the near infrared region produces an extraordinary 104-fold enhancement of the blue second harmonic intensity generated in the surface of a LiNbO3 crystal. The results open new perspectives for the design of efficient hybrid plasmonic frequency converters in miniaturized devices.

scholarly journals Second harmonic generation enhancement by polarization-matched nanostructures -INVITED

2020 ◽  
Vol 238 ◽  
pp. 05001
Author(s):  
Christoph Dreser ◽  
Emre Gürdal ◽  
Godofredo Bautista ◽  
Anke Horneber ◽  
Xiaorun Zang ◽  
...  
Keyword(s):  
High Resolution ◽  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Frequency Conversion ◽  
Second Harmonic ◽  
Plasmonic Nanostructures ◽  
Nonlinear Crystals ◽  
Laser Optics ◽  
Plasmonic Nanoantennas ◽  
High Resolution Microscopy

Frequency conversion plays an important role in both fundamental and applied nano-optics. Doubling the frequency of light by second harmonic generation (SHG) is a vital process e.g. in laser optics or high-resolution microscopy. SHG can be created through symmetry breaking at plasmonic nanostructures, or the local high electric near-fields of plasmonic nanoantennas can be utilized to further enhance the SHG e.g. from nonlinear crystals. Examples of SHG microscopy using cylindrical vector beams in combination with tilted nanocones and radially symmetric oligomers are shown as well as enhancement studies of the SHG from nonlinear crystals decorated with polarization-matched nanostructures.

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