Nonlinear Optical Characterization of InP@ZnS Core-Shell Colloidal Quantum Dots Using 532 nm, 10 ns Pulses
InP@ZnS core-shell colloidal quantum dots (CQDs) were synthesized and characterized using the z-scan technique. The nonlinear refraction and nonlinear absorption coefficients (<i>γ</i> = −2 × 10<sup>−12</sup> cm<sup>2</sup> W<sup>−1</sup>, <i>β&l...
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MDPI AG
2021-05-01
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| Online Access: | https://www.mdpi.com/2079-4991/11/6/1366 |
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| author | Rashid A. Ganeev Andrey I. Zvyagin Ivan A. Shuklov Maksim G. Spirin Oleg V. Ovchinnikov Vladimir F. Razumov |
| author_facet | Rashid A. Ganeev Andrey I. Zvyagin Ivan A. Shuklov Maksim G. Spirin Oleg V. Ovchinnikov Vladimir F. Razumov |
| author_sort | Rashid A. Ganeev |
| collection | DOAJ |
| description | InP@ZnS core-shell colloidal quantum dots (CQDs) were synthesized and characterized using the z-scan technique. The nonlinear refraction and nonlinear absorption coefficients (<i>γ</i> = −2 × 10<sup>−12</sup> cm<sup>2</sup> W<sup>−1</sup>, <i>β</i> = 4 × 10<sup>−8</sup> cm W<sup>−1</sup>) of these CQDs were determined using 10 ns, 532 nm pulses. The saturable absorption (<i>β</i> = −1.4 × 10<sup>−9</sup> cm W<sup>−1</sup>, <i>I</i><sub>sat</sub> = 3.7 × 10<sup>8</sup> W cm<sup>−2</sup>) in the 3.5 nm CQDs dominated at small intensities of the probe pulses (<i>I</i> ≤ 7 × 10<sup>7</sup> W cm<sup>−2</sup>) followed by reverse saturable absorption at higher laser intensities. We report the optical limiting studies using these CQDs showing the suppression of propagated nanosecond radiation in the intensity range of 8 × 10<sup>7</sup>–2 × 10<sup>9</sup> W cm<sup>−2</sup>. The role of nonlinear scattering is considered using off-axis z-scan scheme, which demonstrated the insignificant role of this process along the whole range of used intensities of 532 nm pulses. We discuss the thermal nature of the negative nonlinear refraction in the studied species. |
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| last_indexed | 2024-03-10T11:10:31Z |
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| series | Nanomaterials |
| spelling | doaj.art-994c9db4a3514c8a95ab896e758e39222023-11-21T20:50:33ZengMDPI AGNanomaterials2079-49912021-05-01116136610.3390/nano11061366Nonlinear Optical Characterization of InP@ZnS Core-Shell Colloidal Quantum Dots Using 532 nm, 10 ns PulsesRashid A. Ganeev0Andrey I. Zvyagin1Ivan A. Shuklov2Maksim G. Spirin3Oleg V. Ovchinnikov4Vladimir F. Razumov5Department of Physics, Voronezh State University, 394006 Voronezh, RussiaDepartment of Physics, Voronezh State University, 394006 Voronezh, RussiaLaboratory for Photonics of Quantum Nanostructures, Moscow Institute of Physics and Technology (National Research University), 141701 Dolgoprudny, RussiaLaboratory for Photonics of Quantum Nanostructures, Moscow Institute of Physics and Technology (National Research University), 141701 Dolgoprudny, RussiaDepartment of Physics, Voronezh State University, 394006 Voronezh, RussiaLaboratory for Photonics of Quantum Nanostructures, Moscow Institute of Physics and Technology (National Research University), 141701 Dolgoprudny, RussiaInP@ZnS core-shell colloidal quantum dots (CQDs) were synthesized and characterized using the z-scan technique. The nonlinear refraction and nonlinear absorption coefficients (<i>γ</i> = −2 × 10<sup>−12</sup> cm<sup>2</sup> W<sup>−1</sup>, <i>β</i> = 4 × 10<sup>−8</sup> cm W<sup>−1</sup>) of these CQDs were determined using 10 ns, 532 nm pulses. The saturable absorption (<i>β</i> = −1.4 × 10<sup>−9</sup> cm W<sup>−1</sup>, <i>I</i><sub>sat</sub> = 3.7 × 10<sup>8</sup> W cm<sup>−2</sup>) in the 3.5 nm CQDs dominated at small intensities of the probe pulses (<i>I</i> ≤ 7 × 10<sup>7</sup> W cm<sup>−2</sup>) followed by reverse saturable absorption at higher laser intensities. We report the optical limiting studies using these CQDs showing the suppression of propagated nanosecond radiation in the intensity range of 8 × 10<sup>7</sup>–2 × 10<sup>9</sup> W cm<sup>−2</sup>. The role of nonlinear scattering is considered using off-axis z-scan scheme, which demonstrated the insignificant role of this process along the whole range of used intensities of 532 nm pulses. We discuss the thermal nature of the negative nonlinear refraction in the studied species.https://www.mdpi.com/2079-4991/11/6/1366core-shell colloidal quantum dotsInP@ZnSnonlinear absorptionnonlinear refractionsaturable absorption |
| spellingShingle | Rashid A. Ganeev Andrey I. Zvyagin Ivan A. Shuklov Maksim G. Spirin Oleg V. Ovchinnikov Vladimir F. Razumov Nonlinear Optical Characterization of InP@ZnS Core-Shell Colloidal Quantum Dots Using 532 nm, 10 ns Pulses Nanomaterials core-shell colloidal quantum dots InP@ZnS nonlinear absorption nonlinear refraction saturable absorption |
| title | Nonlinear Optical Characterization of InP@ZnS Core-Shell Colloidal Quantum Dots Using 532 nm, 10 ns Pulses |
| title_full | Nonlinear Optical Characterization of InP@ZnS Core-Shell Colloidal Quantum Dots Using 532 nm, 10 ns Pulses |
| title_fullStr | Nonlinear Optical Characterization of InP@ZnS Core-Shell Colloidal Quantum Dots Using 532 nm, 10 ns Pulses |
| title_full_unstemmed | Nonlinear Optical Characterization of InP@ZnS Core-Shell Colloidal Quantum Dots Using 532 nm, 10 ns Pulses |
| title_short | Nonlinear Optical Characterization of InP@ZnS Core-Shell Colloidal Quantum Dots Using 532 nm, 10 ns Pulses |
| title_sort | nonlinear optical characterization of inp zns core shell colloidal quantum dots using 532 nm 10 ns pulses |
| topic | core-shell colloidal quantum dots InP@ZnS nonlinear absorption nonlinear refraction saturable absorption |
| url | https://www.mdpi.com/2079-4991/11/6/1366 |
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