Ultrathin Second‐Harmonic Metasurfaces with Record‐High Nonlinear Optical Response

2016 ◽  
Vol 4 (5) ◽  
pp. 664-670 ◽  
Author(s):  
Jongwon Lee ◽  
Nishant Nookala ◽  
J. Sebastian Gomez‐Diaz ◽  
Mykhailo Tymchenko ◽  
Frederic Demmerle ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Second Harmonic ◽  
Optical Response ◽  
Nonlinear Optical Response

Crystal polarity control of ZnO films and nonlinear optical response

2009 ◽  
Vol 1201 ◽  
Author(s):  
Jin Sub Park ◽  
Yoshiki Yamazaki ◽  
Yoshihiro Takahshi ◽  
Tsutomu Minegishi ◽  
Seunghwan Park ◽  
...  
Keyword(s):  
Nonlinear Optical ◽  
Second Harmonic ◽  
Optical Response ◽  
Buffer Layers ◽  
Nonlinear Optical Response ◽  
Control Technique ◽  
Zno Films ◽  
Growth Technique ◽  
Polarity Inversion

AbstractWe report that the nonlinear optical response of polarity controlled ZnO films grown by selective growth technique of Zn-polar and O-polar ZnO layers on sapphire substrate using Cr-compound buffer layers. ZnO layers grown on CrN/sapphire show Zn polar, while those grown on Cr2O3/sapphire result in O-polar ZnO films. In order to verify the origin of nonlinear optical response of ZnO, the polarity-controlled ZnO thin films grown on different buffer layers were investigated as nonlinear optical materials for second harmonic generation (SHG). The effective nonlinear optical coefficient (deff) of ZnO grown on Cr-compound buffer layers showed a higher value than that of ZnO grown on MgO buffer layers. Finally, by combining suggested in-situ polarity control technique with photolithography technique, we have fabricated 1D and 2D periodically-polarity-inverted (PPI) hetro-structures with periodicity ranging from 60 μm to 2 μm. The lateral polarity inversion is confirmed by piezo response microscopy. Such PPI ZnO heterostructures show the enhancement of SHG intensity comparing with the ZnO films.

scholarly journals An investigation on the second-order nonlinear optical response of cationic bipyridine or phenanthroline iridium(iii) complexes bearing cyclometallated 2-phenylpyridines with a triphenylamine substituent

2018 ◽  
Vol 47 (25) ◽  
pp. 8292-8300 ◽  
Author(s):  
Claus Hierlinger ◽  
David B. Cordes ◽  
Alexandra M. Z. Slawin ◽  
Alessia Colombo ◽  
Claudia Dragonetti ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Optical Response ◽  
Second Order ◽  
Polymeric Film ◽  
Nonlinear Optical Response ◽  
Nlo Response

A novel cationic Ir(iii) complex, characterized by a large NLO response, can be incorporated into a polymeric film leading to a good second-harmonic generation.

scholarly journals Strong near band-edge excited second-harmonic generation from multilayer 2H Tin diselenide

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Rabindra Biswas ◽  
Medha Dandu ◽  
Asish Prosad ◽  
Sarthak Das ◽  
Sruti Menon ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Optical Response ◽  
Propagation Model ◽  
Nonlinear Optical Response ◽  
Band Edge ◽  
Near Band Edge ◽  
Nonlinear Wave Propagation

AbstractWe report strong second-harmonic generation (SHG) from 2H polytype of multilayer Tin diselenide (SnSe2) for fundamental excitation close to the indirect band-edge in the absence of excitonic resonances. Comparison of SHG and Raman spectra from exfoliated SnSe2 flakes of different polytypes shows strong (negligible) SHG and Raman Eg mode at 109 cm−1 (119 cm−1), consistent with 2H (1T) polytypes. The difference between the A1g–Eg Raman peak positions is found to exhibit significant thickness dependent for the 1T form, which is found to be absent for the 2H form. The observed thickness dependence of SHG with rapid oscillations in signal strength for small changes in flake thickness are in good agreement with a nonlinear wave propagation model considering nonlinear polarization with alternating sign from each monolayer. The nonlinear optical susceptibility extracted from SHG signal comparison with standard quartz samples for 1040 nm excitation is found to be more than 4-times higher than that at 1550 nm. This enhanced nonlinear response at 1040 nm is attributed to the enhanced nonlinear optical response for fundamental excitation close to the indirect band-edge. We also study SHG from heterostructures of monolayer MoS2/multilayer SnSe2 which allows us to unambiguously compare the nonlinear optical response of SnSe2 with MoS2. We find the SHG signal and any interference effect in the overlap region to be dominated by the SnSe2 layer for the excitation wavelengths considered. The comparison of SHG from SnSe2 and MoS2 underscores that the choice of the 2D material for a particular nonlinear optical application is contextual on the wavelength range of interest and its optical properties at those wavelengths. The present works further highlights the usefulness of near band-edge enhancement of nonlinear processes in emerging 2D materials towards realizing useful nanophotonic devices.

Revisiting Thiophosphate Pb3P2S8: A Multifunctional Material Combining a Nonlinear Optical Response and Photocurrent Response

2021 ◽  
Author(s):  
Bingheng Ji ◽  
Elizabeth Guderjahn ◽  
Kui Wu ◽  
Tajamul Hussain Syed ◽  
Wei Wei ◽  
...  
Keyword(s):  
Electronic Structure ◽  
Second Harmonic Generation ◽  
Dft Calculations ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Optical Response ◽  
Nonlinear Optical Response ◽  
Photocurrent Response ◽  
Multifunctional Material

Pb3P2S8 was structurally characterized three decades ago with a second harmonic generation response reported. In this work, Pb3P2S8 was revisited to investigate its electronic structure via DFT calculations and optical...

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