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Second harmonic generation and broad-band photoluminescence in mesoporous Si/SiO<sub>2</sub> nanoparticles.

ABSTRACT: Efficient second harmonic generation and broad-band photoluminescence from deeply subwavelength and nontoxic nanoparticles is essential for nanophotonic applications. Here, we explore nonlinear optical response from mesoporous Si/SiO2, SiO2, and Si nanoparticles, considering various fabrication and treatment procedures. We show that thermal annealing (including femtosecond laser treatment) of mesoporous Si/SiO2 nanoparticles provides the transformation of Si phase from amorphous to crystalline, enhancing the second harmonic and nonlinear photoluminescent response. Notably, the SiO2 mesoporous frame of the considered Si/SiO2 nanoparticles plays a dual positive role for the nonlinear process: it stabilizes the Si material, and SiO2:OH- material has a second-order nonlinearity itself and impacts to the observed second harmonic signal.

SUBMITTER: Mastalieva V 

PROVIDER: S-EPMC11501142 | biostudies-literature | 2024 Aug

REPOSITORIES: biostudies-literature

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Efficient second harmonic generation and broad-band photoluminescence from deeply subwavelength and nontoxic nanoparticles is essential for nanophotonic applications. Here, we explore nonlinear optical response from mesoporous Si/SiO<sub>2</sub>, SiO<sub>2</sub>, and Si nanoparticles, considering various fabrication and treatment procedures. We show that thermal annealing (including femtosecond laser treatment) of mesoporous Si/SiO<sub>2</sub> nanoparticles provides the transformation of Si phas  ...[more]

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