Nonlinear optical processes in 2D Cairo pentagonal palladium phosphide sulfideOA
Anisotropic nonlinear optical two-dimensional(2D)materials hold great potential for advancing photonics and optoelectronics applications due to their coexistence of strong nonlinear optical response and high nonlinear anisotropy ratio,such as crystal orientation identification,bio-microscopy,optical switching.This work focused on the unique layer-dependent symmetry breaking and strong second harmonic generation(SHG)anisotropy based on palladium phosphide sulfide(PdPS),a pentagonal 2D semiconductor with Cairo tiling.PdPS exhibits even-layer inversion symmetry breaking and highly tunable SHG anisotropy,contrast to odd-layer inversion symmetry.Notably,the SHG anisotropy ratio reaches up to 32.7 for six layers(<5 nm)PdPS.This ratio is the highest in such thin 2D materials to the best of our knowledge.Furthermore,its optical properties can be tuned easily through layer number and microdevice configuration.As layer number of PdPS decreases from six layers to two layers,the anisotropic ratio drops drastically from 32.7 to 0.89.In addition,the overall SHG signal can be increased by 10 times when integrated with a photonic crystal device.These findings suggest that PdPS holds great promise for use in polarization-sensitive and layer-engineered nonlinear photonic applications like photodetectors,polarized lasers,polarized light emitting diodes and reflective polarizer.
Wenting Aletheia;Mengting Jiang;Mengyao Cao;Sunchao Huang;James Lourembam;Xuezhi Ma;Ruihuan Duan;Zheng Liu
School of Materials Science and Engineering,Nanyang Technological University,50 Nanyang Avenue,Singapore 639798,SingaporeInstitute of Materials Research and Engineering(IMRE),Agency for Science,Technology and Research(ASTAR),Fusionopolis Way,Innovis,#08-03,Singapore 138634,SingaporeSchool of Materials Science and Engineering,Nanyang Technological University,50 Nanyang Avenue,Singapore 639798,SingaporeSchool of Electronic Science and Engineering University of Electronic Science and Technology of China,Chengdu 611731,ChinaInstitute of Materials Research and Engineering(IMRE),Agency for Science,Technology and Research(ASTAR),Fusionopolis Way,Innovis,#08-03,Singapore 138634,SingaporeInstitute of Materials Research and Engineering(IMRE),Agency for Science,Technology and Research(ASTAR),Fusionopolis Way,Innovis,#08-03,Singapore 138634,Singapore Quantum Innovation Centre(Q.InC),Agency for Science,Technology and Research(ASTAR),2 Fusionopolis Way,Innovis,#08-03,Singapore 138634,SingaporeSchool of Materials Science and Engineering,Nanyang Technological University,50 Nanyang Avenue,Singapore 639798,SingaporeSchool of Materials Science and Engineering,Nanyang Technological University,50 Nanyang Avenue,Singapore 639798,Singapore
数理科学
palladium phosphide sulfide(PdPS)two-dimensional(2D)materialssymmetry breakingsecond harmonic generationanisotropy
《Nano Research》 2026 (6)
P.584-591,8
supports from Singapore National Research Foundation-Competitive Research Program(Nos.NRF-CRP22-2019-0007,NRF-CRP31-0001,and NRF-CRP264-2021-0004).This research is also supported by A*STAR SERC MTC Programmatic Fund(No.M23M2b0056)the Singapore Ministry of Education Tier 3 and Tier 2 Programmatic Fund(award no.MOEMOET32023-0003,and MOE-T2EP50223-0008)the Singapore Ministry of Education Academic Research Fund(AcRF)Tier 1(No.023785-00001(RT7/23))support from the Agency for Science,Technology and Research(A*STAR)under the MTC Young Individual Research Grants(YIRG)(No.M24N8c0097)support from the Agency for Science,Technology and Research(A*STAR)under the MTC Young Individual Research Grants(YIRG)(No.M23M7c0129)Quantum Innovation Centre(Q.InC)core fundingsupport from the Agency for Science,Technology and Research(A*STAR)under the MTC Individual Research Grants(IRG)(No.M23M6c0104).
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