Article
Spectroscopy
Shanming Chen, Xun Cong, Junyan Chen, Jincheng Cao, Yao Fu, Siqi Wang, Hongwei Zang, Helong Li, Huailiang Xu
Summary: The study investigates the relationship between femtosecond laser-induced plasma spectroscopy (fs-LIPS) emissions of trace metal elements in water and the chirped pulse duration at different input laser energies. The dependence of fs-LIPS emission of trace Al element in water on the pulse duration is attributed to the tradeoff between strong field ionization (SFI) and subsequent avalanche ionization (AI) determined by the wide bandgap semiconductor property of water.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2022)
Article
Multidisciplinary Sciences
O. A. Kapush, V. M. Dzhagan, N. V. Mazur, Ye. O. Havryliuk, A. Karnaukhov, R. A. Redko, S. I. Budzulyak, S. Boruk, I. S. Babichuk, M. I. Danylenko, V. O. Yukhymchuk
Summary: An affordable colloidal synthesis method for Cu2ZnSnS4 (CZTS) nanocrystals (NCs) is developed, which can produce bare CZTS NCs, cation substituted CZTS NCs, and CZTS-based hetero-NCs. Raman spectroscopy is used for structural characterization, and CdTe and Ag NCs are good seed NCs for CZTS compound, while Au NCs do not work as seed NCs. Partial substitution of Zn with Ba improves the structural quality of bare CZTS NCs, while partial substitution of Cu with Ag deteriorates the structural quality of NCs.
Article
Materials Science, Multidisciplinary
Elisa Muzi, Maxime Cavillon, Matthieu Lancry, Francois Brisset, Benjamin Sapaly, Davide Janner, Bertrand Poumellec
Summary: This study investigates the role of adding B2O3 into a lithium niobium silicate glass matrix and finds that SHG signature appears faster in highly doped B2O3 glass, with the polar axis of LiNbO3 nanocrystals affected by writing laser polarization.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Optics
Qi Yu, Zhen Zhang, Xuewen Shu
Summary: In this study, a multi-dimensional fabrication parameter system for femtosecond laser fabrication of SNAP devices is proposed, with optimized parameters leading to a nearly 5 times larger effective radius variation (ERV) compared to previous methods. This work demonstrates the potential for femtosecond laser inscription technology to fabricate SNAP devices with ultra-high precision and low loss.
Article
Chemistry, Multidisciplinary
Michael W. Swift, John L. Lyons, Alexander L. Efros, Peter C. Sercel
Summary: This paper investigates the dispersion of Rashba excitons, their behavior in quasi-2D cylindrical quantum dots, discusses the potential extension of this model to 3D nanocrystals, and establishes criteria for achieving a bright ground exciton state.
Article
Spectroscopy
Shanming Chen, Xun Cong, Junyan Chen, Jincheng Cao, Yao Fu, Siqi Wang, Hongwei Zang, Helong Li, Huailiang Xu
Summary: We investigated femtosecond laser-induced plasma spectroscopy (fs-LIPS) of water and found that the characteristic fs-LIPS emissions from trace metal elements in water exhibit different dependences on the chirped pulse duration at different input laser energies. This dependence is attributed to the tradeoff between strong field ionization (SFI) and subsequent avalanche ionization (AI), both of which are determined by the wide bandgap semiconductor property of water.
SPECTROCHIMICA ACTA PART B-ATOMIC SPECTROSCOPY
(2022)
Article
Chemistry, Inorganic & Nuclear
Donovan Thomas, Harold O. Lee, Kevin C. Santiago, Marvin Pelzer, Ayodeji Kuti, LaRico J. Treadwell, Messaoud Bahoura
Summary: In this study, europium-doped CdSe quantum dots were successfully synthesized using a one-pot microwave synthesis method. By varying microwave irradiation temperatures, hold times, and dopant concentration, the optical properties of CdSe quantum dots were tuned. UV-Vis spectroscopy and photoluminescence data show that structural incorporation of europium affects the optical properties of CdSe QDs.
DALTON TRANSACTIONS
(2021)
Article
Optics
E. F. Martynovich, N. L. Lazareva, S. A. Zilov
Summary: The study investigates the creation of luminescence centers by laser radiation in transparent anisotropic crystals using MgF2 as an example. A luminescent method was developed to monitor the concentration of created centers, with a direct proportionality between luminescence intensity and center concentration. Coherent pairs of femtosecond laser pulses were used to longitudinally position light action on the medium during the creation of spatially modulated structures. The experiments also showed an intermediate mechanism of multiphoton-tunneling ionization during laser defects formation in crystals.
JOURNAL OF LUMINESCENCE
(2021)
Article
Optics
Xingqing Xie, Chengzhi Jin, Zhen Pan, Jianguo Wang, Lianzhong Deng, Yunhua Yao, Dalong Qi, Zhenrong Sun, Jianrong Qiu, Shian Zhang
Summary: The upconversion luminescence of lanthanide ion doped nanocrystals under ultrashort laser pulse excitation has significant applications in various fields. Quantitative differentiation of different excitation mechanisms, such as excited state absorption (ESA), energy transfer upconversion (ETU), and multi-photon absorption (MPA), has rarely been reported with experimental proof. In this study, a simple but effective method is demonstrated to quantitatively identify simultaneous MPA from other mechanisms in Er3+ doped NaYF4 nanocrystals in aluminosilicate glass ceramics under femtosecond laser excitation. Comparative studies using laser pulses of different time duration or repetition rate are performed to obtain convincing experimental evidence for their respective contribution weights.
JOURNAL OF LUMINESCENCE
(2023)
Article
Optics
Rui Zhang, Zhe Yu, Zhaowei Zhang
Summary: This study investigates the influence of the chirp of the white-light continuum seed on the pulse characteristics of femtosecond optical parametric amplifiers (OPAs). It shows that manipulating the chirp can directly lead to nearly transform-limited optical pulses from OPAs, without the need for dispersion-compensation elements.
OPTICS COMMUNICATIONS
(2023)
Article
Chemistry, Multidisciplinary
Kazutaka Iida, Yota Uehigashi, DaeGwi Kim
Summary: This study investigated the origin of photoluminescence properties of hydrothermally-synthesized water-soluble CuInS2 quantum dots, revealing that the emission mechanism is donor-acceptor pair emission. Experimental results showed that characteristics of photoluminescence were influenced by detection energy, time, and excitation light intensity.
Article
Chemistry, Multidisciplinary
Deepshikha Arora, Hui Ru Tan, Wen-Ya Wu, Yinthai Chan
Summary: The oriented attachment (OA) technique is useful for producing quantum confined nanomaterials. This study demonstrates the OA of 1D Cu2-xS nanorods into 2D raftlike structures through etching and fusion processes.
Article
Optics
Yuliya Binhammer, Thomas Binhammer, Robin Mevert, Tino Lang, Angelika Ruck, Uwe Morgner
Summary: The report describes a high power, ultra-broadband, quickly tunable non-collinear parametric oscillator capable of delivering femtosecond pulses in two synchronized output beams. The device is ideal for spectroscopy or multi-color imaging applications, and preliminary results on two-color functional microscopy are presented.
Article
Chemistry, Physical
Ankita Bora, Josephine Lox, Rene Huebner, Nelli Weiss, Houman Bahmani Jalali, Francesco di Stasio, Christine Steinbach, Nikolai Gaponik, Vladimir Lesnyak
Summary: Copper chalcogenide-based nanocrystals (NCs) are promising alternatives to toxic Cd/Pb chalcogenide-based NCs in various applications. However, direct synthesis methods of this class of compounds suffer from inhomogeneities in size, shape, and composition. Partial cation exchange and synthetic strategies can improve control and narrow photoluminescence (PL) bandwidths. This study presents a two-step colloidal synthesis of Cu-Zn-In-Se (CZISe) NCs via partial cation exchange, resulting in gradient-alloyed CZISe NCs with a Zn-rich surface. The synthesized NCs exhibit high photoluminescence quantum yield (PLQY) and narrow PL bands, offering potential for solar energy harvesting and bioimaging applications. Rating: 8/10
CHEMISTRY OF MATERIALS
(2023)
Article
Chemistry, Multidisciplinary
Sylwia Parzyszek, Jacopo Tessarolo, Adrian Pedrazo-Tardaos, Ana M. Ortuno, Maciej Baginski, Sara Bals, Guido H. Clever, Wiktor Lewandowski
Summary: This study proposes a strategy to achieve strongly dissymetric CPL in nanocomposite films based on chiroptical induction and energy transfer to semiconductor nanocrystals. By controlling the chirality of helical nanofilaments in liquid crystal matrix and adjusting energy transfer from organic films to quantum dots, CPL wavelengths can be conveniently tuned. This approach provides a simple and versatile method to modulate the CPL activity of organic materials.
