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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 (γ = −2 × 10(−12) cm(2) W(−1), β = 4 × 10(−8) cm W(−1)) of these CQDs were determined using 10 ns, 532 nm pulses. The saturab...
Autores principales: | , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
MDPI
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8224269/ https://www.ncbi.nlm.nih.gov/pubmed/34064198 http://dx.doi.org/10.3390/nano11061366 |
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author | Ganeev, Rashid A. Zvyagin, Andrey I. Shuklov, Ivan A. Spirin, Maksim G. Ovchinnikov, Oleg V. Razumov, Vladimir F. |
author_facet | Ganeev, Rashid A. Zvyagin, Andrey I. Shuklov, Ivan A. Spirin, Maksim G. Ovchinnikov, Oleg V. Razumov, Vladimir F. |
author_sort | Ganeev, Rashid A. |
collection | PubMed |
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 (γ = −2 × 10(−12) cm(2) W(−1), β = 4 × 10(−8) cm W(−1)) of these CQDs were determined using 10 ns, 532 nm pulses. The saturable absorption (β = −1.4 × 10(−9) cm W(−1), I(sat) = 3.7 × 10(8) W cm(−2)) in the 3.5 nm CQDs dominated at small intensities of the probe pulses (I ≤ 7 × 10(7) W cm(−2)) 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(7)–2 × 10(9) W cm(−2). 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. |
format | Online Article Text |
id | pubmed-8224269 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | MDPI |
record_format | MEDLINE/PubMed |
spelling | pubmed-82242692021-06-25 Nonlinear Optical Characterization of InP@ZnS Core-Shell Colloidal Quantum Dots Using 532 nm, 10 ns Pulses Ganeev, Rashid A. Zvyagin, Andrey I. Shuklov, Ivan A. Spirin, Maksim G. Ovchinnikov, Oleg V. Razumov, Vladimir F. Nanomaterials (Basel) Article InP@ZnS core-shell colloidal quantum dots (CQDs) were synthesized and characterized using the z-scan technique. The nonlinear refraction and nonlinear absorption coefficients (γ = −2 × 10(−12) cm(2) W(−1), β = 4 × 10(−8) cm W(−1)) of these CQDs were determined using 10 ns, 532 nm pulses. The saturable absorption (β = −1.4 × 10(−9) cm W(−1), I(sat) = 3.7 × 10(8) W cm(−2)) in the 3.5 nm CQDs dominated at small intensities of the probe pulses (I ≤ 7 × 10(7) W cm(−2)) 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(7)–2 × 10(9) W cm(−2). 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. MDPI 2021-05-21 /pmc/articles/PMC8224269/ /pubmed/34064198 http://dx.doi.org/10.3390/nano11061366 Text en © 2021 by the authors. https://creativecommons.org/licenses/by/4.0/Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Ganeev, Rashid A. Zvyagin, Andrey I. Shuklov, Ivan A. Spirin, Maksim G. Ovchinnikov, Oleg V. Razumov, Vladimir F. Nonlinear Optical Characterization of InP@ZnS Core-Shell Colloidal Quantum Dots Using 532 nm, 10 ns Pulses |
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 | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8224269/ https://www.ncbi.nlm.nih.gov/pubmed/34064198 http://dx.doi.org/10.3390/nano11061366 |
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