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dc.contributor.authorTan, Jamesen_US
dc.contributor.authorShi, Xunchengen_US
dc.contributor.authorLu, Kunzeen_US
dc.contributor.authorJoo, Hyo-Junen_US
dc.contributor.authorKim, Youngminen_US
dc.contributor.authorChen, Melvinaen_US
dc.contributor.authorZhang, Linen_US
dc.contributor.authorTan, Chuan Sengen_US
dc.contributor.authorLim, Khee Yongen_US
dc.contributor.authorQuek, Elginen_US
dc.contributor.authorNam, Donguken_US
dc.identifier.citationTan, J., Shi, X., Lu, K., Joo, H., Kim, Y., Chen, M., Zhang, L., Tan, C. S., Lim, K. Y., Quek, E. & Nam, D. (2023). Enhanced second-harmonic generation in strained germanium-on-insulator microdisks for integrated quantum photonic technologies. Optics Letters, 48(16), 4269-4271.
dc.description.abstractQuantum photonic circuits have recently attracted much attention owing to the potential to achieve exceptional performance improvements over conventional classical electronic circuits. Second-order χ(2) nonlinear processes play an important role in the realization of several key quantum photonic components. However, owing to their centrosymmetric nature, CMOS-compatible materials including silicon (Si) and germanium (Ge) traditionally do not possess the χ(2) response. Recently, second-harmonic generation (SHG) that requires the χ(2) response was reported in Ge, but no attempts at enhancing the SHG signal have been conducted and proven experimentally. Herein, we demonstrate the effect of strain on SHG from Ge by depositing a silicon nitride (Si3N4) stressor layer on Ge-on-insulator (GOI) microdisks. This approach allows the deformation of the centrosymmetric unit cell structure of Ge, which can further enhance the χ(2) nonlinear susceptibility for SHG emission. The experimental observation of SHG under femtosecond optical pumping indicates a clear trend of enhancement in SHG signals with increasing strain. Such improvements boost conversion efficiencies by 300% when compared to the control counterpart. This technique paves the way toward realizing a CMOS-compatible material with nonlinear characteristics, presenting unforeseen opportunities for its integration in the semiconductor industry.en_US
dc.description.sponsorshipAgency for Science, Technology and Research (A*STAR)en_US
dc.description.sponsorshipMinistry of Education (MOE)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relationRG 115/21en_US
dc.relation.ispartofOptics Lettersen_US
dc.rights© 2023 Optica Publishing Group. All rights reserved.en_US
dc.subjectEngineering::Electrical and electronic engineeringen_US
dc.titleEnhanced second-harmonic generation in strained germanium-on-insulator microdisks for integrated quantum photonic technologiesen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen_US
dc.subject.keywordsQuantum Photonicen_US
dc.subject.keywordsSecond-Harmonic Generationen_US
dc.description.acknowledgementMinistry of Education - Singapore (AcRF TIER 1 (RG115/21)); iGrant of Singapore (A*STAR AME IRG (A2083c0053)); National Research Foundation Singapore (Competitive Research Program (NRF-CRP19-2017-01)); NRF-A*STAR Joint Grant (Quantum Engineering Program (NRF2022-QEP2-02-P13)).en_US
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