Enhanced Ultrafast Broadband Reverse Saturable Absorption in Twistacenes with Enlarged π-Conjugated Central Bridge
Optical nonlinearities of two all-carbon twistacenes, <b>DPyA</b> and <b>DPyN</b>, with the different π-conjugated central bridges were investigated. The nonlinear absorption properties of these compounds were measured using the femtosecond Z-scan with wavelengths between 650...
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MDPI AG
2022-12-01
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| Series: | Molecules |
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| Online Access: | https://www.mdpi.com/1420-3049/27/24/9059 |
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| author | Xindi Liu Wenfa Zhou Mengyi Wang Xingzhi Wu Jidong Jia Jinchong Xiao Junyi Yang Yinglin Song |
| author_facet | Xindi Liu Wenfa Zhou Mengyi Wang Xingzhi Wu Jidong Jia Jinchong Xiao Junyi Yang Yinglin Song |
| author_sort | Xindi Liu |
| collection | DOAJ |
| description | Optical nonlinearities of two all-carbon twistacenes, <b>DPyA</b> and <b>DPyN</b>, with the different π-conjugated central bridges were investigated. The nonlinear absorption properties of these compounds were measured using the femtosecond Z-scan with wavelengths between 650 and 900 nm. It has been found that the nonlinear absorption originated from two-photon absorption (TPA) and TPA-induced excited state absorption (ESA), wherein <b>DPyA</b> demonstrates higher performance than <b>DPyN</b>. The TPA cross section of <b>DPyA</b> (4300 GM) is nearly 4.3 times larger than that of <b>DPyN</b> at 650 nm. Moreover, the different central structures modulate the intensity of ESA at 532 nm, and <b>DPyA</b> exhibits an excellent ESA at 532 nm with multi-pulse excitation. Meanwhile, the result of data fitting and quantum chemistry calculation shows that the enhancement of nonlinear absorption in <b>DPyA</b> is due to the extended π- conjugated bridge and improved delocalization of π-electrons. These all-carbon twistacenes could yield potential applications in optical power limiting (OPL) technology. |
| first_indexed | 2024-03-09T16:01:23Z |
| format | Article |
| id | doaj.art-7f0c1e166305432696e1a43736adb905 |
| institution | Directory Open Access Journal |
| issn | 1420-3049 |
| language | English |
| last_indexed | 2024-03-09T16:01:23Z |
| publishDate | 2022-12-01 |
| publisher | MDPI AG |
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| series | Molecules |
| spelling | doaj.art-7f0c1e166305432696e1a43736adb9052023-11-24T17:02:06ZengMDPI AGMolecules1420-30492022-12-012724905910.3390/molecules27249059Enhanced Ultrafast Broadband Reverse Saturable Absorption in Twistacenes with Enlarged π-Conjugated Central BridgeXindi Liu0Wenfa Zhou1Mengyi Wang2Xingzhi Wu3Jidong Jia4Jinchong Xiao5Junyi Yang6Yinglin Song7School of Physical Science and Technology, Soochow University, Suzhou 215006, ChinaDepartment of Physics, Harbin Institute of Technology, Harbin 150001, ChinaSchool of Physical Science and Technology, Soochow University, Suzhou 215006, ChinaJiangsu Key Laboratory of Micro and Nano Heat Fluid Flow Technology and Energy Application, School of Physical Science and Technology, Suzhou University of Science and Technology, Suzhou 215009, ChinaDepartment of Physics, Harbin Institute of Technology, Harbin 150001, ChinaKey Laboratory of Chemical Biology of Hebei Province, College of Chemistry and Environment Science, Hebei University, Baoding 071002, ChinaSchool of Physical Science and Technology, Soochow University, Suzhou 215006, ChinaSchool of Physical Science and Technology, Soochow University, Suzhou 215006, ChinaOptical nonlinearities of two all-carbon twistacenes, <b>DPyA</b> and <b>DPyN</b>, with the different π-conjugated central bridges were investigated. The nonlinear absorption properties of these compounds were measured using the femtosecond Z-scan with wavelengths between 650 and 900 nm. It has been found that the nonlinear absorption originated from two-photon absorption (TPA) and TPA-induced excited state absorption (ESA), wherein <b>DPyA</b> demonstrates higher performance than <b>DPyN</b>. The TPA cross section of <b>DPyA</b> (4300 GM) is nearly 4.3 times larger than that of <b>DPyN</b> at 650 nm. Moreover, the different central structures modulate the intensity of ESA at 532 nm, and <b>DPyA</b> exhibits an excellent ESA at 532 nm with multi-pulse excitation. Meanwhile, the result of data fitting and quantum chemistry calculation shows that the enhancement of nonlinear absorption in <b>DPyA</b> is due to the extended π- conjugated bridge and improved delocalization of π-electrons. These all-carbon twistacenes could yield potential applications in optical power limiting (OPL) technology.https://www.mdpi.com/1420-3049/27/24/9059twistacenesnonlinear opticsZ-scanexcited state absorptionoptical power limiting |
| spellingShingle | Xindi Liu Wenfa Zhou Mengyi Wang Xingzhi Wu Jidong Jia Jinchong Xiao Junyi Yang Yinglin Song Enhanced Ultrafast Broadband Reverse Saturable Absorption in Twistacenes with Enlarged π-Conjugated Central Bridge Molecules twistacenes nonlinear optics Z-scan excited state absorption optical power limiting |
| title | Enhanced Ultrafast Broadband Reverse Saturable Absorption in Twistacenes with Enlarged π-Conjugated Central Bridge |
| title_full | Enhanced Ultrafast Broadband Reverse Saturable Absorption in Twistacenes with Enlarged π-Conjugated Central Bridge |
| title_fullStr | Enhanced Ultrafast Broadband Reverse Saturable Absorption in Twistacenes with Enlarged π-Conjugated Central Bridge |
| title_full_unstemmed | Enhanced Ultrafast Broadband Reverse Saturable Absorption in Twistacenes with Enlarged π-Conjugated Central Bridge |
| title_short | Enhanced Ultrafast Broadband Reverse Saturable Absorption in Twistacenes with Enlarged π-Conjugated Central Bridge |
| title_sort | enhanced ultrafast broadband reverse saturable absorption in twistacenes with enlarged π conjugated central bridge |
| topic | twistacenes nonlinear optics Z-scan excited state absorption optical power limiting |
| url | https://www.mdpi.com/1420-3049/27/24/9059 |
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