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...

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.

scholarly journals Intercalating dyes for enhanced contrast in second-harmonic generation imaging of protein crystals

2015 ◽  
Vol 71 (7) ◽  
pp. 1471-1477 ◽  
Author(s):  
Justin A. Newman ◽  
Nicole M. Scarborough ◽  
Nicholas R. Pogranichniy ◽  
Rashmi K. Shrestha ◽  
Richard G. Closser ◽  
...  
Keyword(s):  
Second Harmonic Generation ◽  
Crystal Lattice ◽  
Harmonic Generation ◽  
Nonlinear Optical ◽  
Second Harmonic ◽  
Nonlinear Optical Response ◽  
Protein Crystals ◽  
Kinetics Studies ◽  
Theoretical Predictions ◽  
Second Harmonic Generation Imaging

The second-harmonic generation (SHG) activity of protein crystals was found to be enhanced by up to ∼1000-fold by the intercalation of SHG phores within the crystal lattice. Unlike the intercalation of fluorophores, the SHG phores produced no significant background SHG from solvated dye or from dye intercalated into amorphous aggregates. The polarization-dependent SHG is consistent with the chromophores adopting the symmetry of the crystal lattice. In addition, the degree of enhancement for different symmetries of dyes is consistent with theoretical predictions based on the molecular nonlinear optical response. Kinetics studies indicate that intercalation arises over a timeframe of several minutes in lysozyme, with detectable enhancements within seconds. These results provide a potential means to increase the overall diversity of protein crystals and crystal sizes amenable to characterization by SHG microscopy.

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