Article
Physics, Applied
Ganying Zeng, Zhenyu Fang, Chengbing Qin, Liantuan Xiao, Suotang Jia
Summary: In this work, we developed a method to tune the lattice distortion of multilayer graphene using H2SO4-intercalation, which leads to the acquisition of noncentrosymmetric electric dipoles and enhances the second-harmonic generation (SHG) response. The SHG change is reversible after deintercalation, as the lattice distortion can be restored. Our research on the intercalating-induced SHG effect may contribute to a better design of graphene-based nonlinear optical devices in the future.
APPLIED PHYSICS LETTERS
(2023)
Article
Optics
A. Pakhomov, M. Hammerschmidt, S. Burger, T. Pertsch, F. Setzpfandt
Summary: By investigating surface second-harmonic generation from a stack of dielectric layers, we found that surface responses from all interfaces can efficiently sum up in deeply subwavelength thicknesses, leading to enhanced efficiency of SHG. This surface-driven nonlinearity can be comparable to bulk nonlinearity in noncentrosymmetric semiconductors and can offer high performance for nonlinear nanophotonic applications.
Article
Multidisciplinary Sciences
Kunze Lu, Manlin Luo, Weibo Gao, Qi Jie Wang, Hao Sun, Donguk Nam
Summary: Despite the centrosymmetric nature of graphene, strain engineering can be used to manipulate its lattice arrangement and induce sublattice polarization, activating second harmonic generation (SHG). The SHG signal in strained graphene is boosted 50-fold at low temperatures due to resonant transitions between strain-induced pseudo-Landau levels. The second-order susceptibility of strained graphene exceeds that of hexagonal boron nitride with intrinsic broken inversion symmetry, opening up possibilities for high-efficiency nonlinear devices.
NATURE COMMUNICATIONS
(2023)
Article
Optics
Ying Xie, Hao Yu, Jiahui Wei, Haohai Yu, Huaijin Zhang
Summary: Materials based on group IV chalcogenides have extensive technological importance due to their unique chemical bonding and off-centering of in-layer sublattices. In this study, large-area SnS multilayer films were fabricated and unexpectedly strong second-harmonic generation (SHG) response was observed. The results suggest that multilayer SnS could be a promising nonlinear material with potential applications in optics and photonics.
Article
Multidisciplinary Sciences
Rabindra Biswas, Medha Dandu, Asish Prosad, Sarthak Das, Sruti Menon, Jayanta Deka, Kausik Majumdar, Varun Raghunathan
Summary: Strong second-harmonic generation (SHG) has been observed from the 2H polytype of multilayer SnSe2 in the absence of excitonic resonances, with significant differences in SHG and Raman spectra between different polytypes and thickness-dependent behaviors. The enhanced nonlinear optical response at 1040 nm excitation is attributed to the near band-edge enhancement of nonlinear processes. The comparison of SHG from SnSe2 and MoS2 highlights the importance of considering the optical properties of 2D materials in nonlinear optical applications based on the wavelength range of interest.
SCIENTIFIC REPORTS
(2021)
Article
Chemistry, Multidisciplinary
Yann Foucaud, Bertrand Siboulet, Magali Duvail, Alban Jonchere, Olivier Diat, Rodolphe Vuilleumier, Jean-Francois Dufreche
Summary: A breakthrough method has been developed to predict and interpret SHG signal at the atomic level, showing the significant impact of bulk quadrupole contribution in the SHG response. The experimental results are in unprecedented agreement with the simulated responses.
Article
Chemistry, Multidisciplinary
Mingwen Zhang, Nannan Han, Jing Wang, Zhihong Zhang, Kaihui Liu, Zhipei Sun, Jianlin Zhao, Xuetao Gan
Summary: This study reports that redox-governed charge doping can effectively break the centrosymmetry of bilayer graphene, enabling a strong second harmonic generation (SHG). Control experiments confirm this result and demonstrate that charge doping is an effective method to break the inversion symmetry of bilayer graphene, and SHG spectroscopy is a valid technique to probe molecular doping on two-dimensional materials.
Article
Materials Science, Multidisciplinary
S. B. Bodrov, Yu A. Sergeev, A. Korytin, A. N. Stepanov
Summary: In this study, we investigated the second-harmonic generation of optical radiation with the assistance of intense terahertz electromagnetic pulses on the surface of high-resistivity Si(111). The experimental and theoretical analysis revealed the significant impact of the terahertz field on the generation of second-harmonic signals, especially when the polarizations of the terahertz and second-harmonic fields coincide. Furthermore, the application of the terahertz field was found to be helpful in distinguishing the mechanisms of second-harmonic generation.
Article
Physics, Applied
Hui-Yu Chen, Fumito Araoka, Fang-Yu Lee, Chi Lee, Jui Jiun Chen
Summary: The nonlinear optical response of the blue-phase liquid crystals was investigated using a SHG microscope. It was found that the internal coupling between polarization and structural deformation can be visualized quickly with the aid of the SHM. The induced polarization and SHG intensity in the blue phase were dependent on the electric field strength and transition to the chiral nematic phase.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2023)
Article
Optics
Takashi Fujii, Masahiro Sato, Shin Nakamura, Akiko Kumada, Megumu Miki, Yuji Oishi
Summary: Through spectroscopic measurement using high-intensity femtosecond laser pulses, we found that the performance of electric-field-induced second-harmonic generation increases quadratically with the applied electric field, and the signal intensity increases with the laser energy. These results provide valuable information for electric-field measurement using high-intensity laser pulses.
Article
Optics
Chenglin Wang, Andrey Novitsky, Wenxuan Ge, Dongliang Gao, Lei Gao
Summary: In this paper, high second-harmonic generation (SHG) conversion efficiency is achieved by combining the strong second-order nonlinear effects of graphene and the field-enhancing effects of anisotropic materials. The nonlinear conversion efficiency of radial anisotropic nanoparticles is found to be several orders of magnitude higher than that of isotropic counterpart, due to the additional enhancement of field intensity near the boundary provided by radial anisotropic and the presence of graphene at the particle boundary where the fundamental frequency field is significantly enhanced. Moreover, the highly tunable characteristic of graphene offers additional flexibility for manipulating the SHG spectrum in practical applications.
Article
Chemistry, Physical
Francois Aguillon, Andrei G. Borisov
Summary: In this work, the impact of atomic scale lattice imperfections on the nonlinear response of graphene nanoflakes enhanced by resonance between electromagnetic fields and localized plasmon is investigated theoretically. Using the many-body time-dependent density matrix approach, it is found that a single defect in nanoflakes with thousands of carbon atoms can significantly affect the nonlinear hyperpolarizability and override symmetry constraints. This effect cannot be captured by the relaxation time approximation in quantum or classical frameworks. The results of this study have important implications for the design of nonlinear graphene devices.
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
(2023)
Article
Physics, Applied
Ying Hou, Manlai Ding, Yong Fang, Xueshi Hou, Xiaoling Zhong, Yong Guo, Tingting Guo
Summary: This paper proposes a multilayer graphene frequency doubler utilizing the nonlinear characteristics of graphene to achieve odd harmonic output power higher than even harmonic, with optimization through bias voltage and resonators.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2021)
Article
Physics, Multidisciplinary
Chunchun Wu, Nianze Shang, Zixun Zhao, Zhihong Zhang, Jing Liang, Chang Liu, Yonggang Zuo, Mingchao Ding, Jinhuan Wang, Hao Hong, Jie Xiong, Kaihui Liu
Summary: This research successfully demonstrated facile manipulation of nonlinear optical responses in the MoS2 monolayer system through van der Waals interfacial engineering. Insertion of monolayer graphene weakened the exciton oscillator strength in the MoS2 monolayer, leading to a suppression of second harmonic generation (SHG) intensity; meanwhile, under off-resonance excitation, the SHG intensity was enhanced, likely induced by interlayer excitation.
Article
Optics
Justin Hogue, Patrick Cusson, Michel Meunier, Denis V. Seletskiy, Stephan Reuter
Summary: Researchers have demonstrated sensitive electric field measurements using the coherent homodyne amplification of the electric field induced second harmonic generation (E-FISH) technique. By combining an auxiliary beam with the E-FISH signal, they achieved a seven-fold increase in signal-to-noise ratio and a significant reduction in measurement time. This technique offers advantages such as not requiring intensified detectors and enabling measurements at different repetition rates.
Article
Spectroscopy
Alfia M. Sharafutdinova, Alexander Pavlikov, Alexey M. Rogov, Sofya N. Bokova-Sirosh, Elena D. Obraztsova, Andrey L. Stepanov
Summary: Porous Ge layers consisting of nanowires were formed by low-energy high-dose ion implantation, and studied using Raman spectroscopy with different laser wavelengths. The crystalline volume fraction and local temperature of the layers were determined, along with estimations of crystalline and amorphous volume fractions based on spectral line shape analysis. Differences in penetration depth of the exciting radiation were found to explain the observed results.
JOURNAL OF RAMAN SPECTROSCOPY
(2022)
Article
Chemistry, Multidisciplinary
Maxim Komlenok, Nikolay Kurochitsky, Pavel Pivovarov, Maxim Rybin, Elena Obraztsova
Summary: A new method for fabricating graphene field emitters on various substrates at room temperature and in ambient environment is presented. The desired shape and orientation of graphene flakes along the field are achieved through blister-based laser-induced forward transfer of high-quality single-layer graphene synthesized by chemical vapor deposition. This technique allows the formation of emitting crumpled graphene patterns without compromising the quality of initially synthesized graphene.
Article
Physics, Applied
Pavel V. Fedotov, Elena D. Obraztsova
Summary: This study synthesized narrow graphene nanoribbons and investigated their photoluminescence properties. The results showed that these nanoribbons have a wide optical bandgap and exhibit bright photoluminescence in the infrared spectrum range.
APPLIED PHYSICS LETTERS
(2023)
Article
Engineering, Environmental
Darwin Kurniawan, Michael Ryan Rahardja, Pavel V. Fedotov, Elena D. Obraztsova, Kostya (Ken) Ostrikov, Wei-Hung Chiang
Summary: In this study, lightweight and porous metal-graphene composites with embedded nitrogen-doped graphene quantum dots (NGQDs) and gold nanoparticles (AuNPs) were developed for water monitoring and purification. The composites exhibit reliable photoluminescence for heavy metal detection, high adsorption capacity, and fast catalytic degradation of organic pollutants. The scalable plasma process allows for the fabrication of large-area hierarchical composites with tunable porosity and self-healing ability.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Physics, Applied
A. M. Romashkina, V. B. Novikov, T. V. Murzina
Summary: Compact planar photonic elements with efficient polarization control are important in photonics. This study proposes a design of a chiral periodic metasurface using plasmonic nanodisks and nanorods arranged asymmetrically. The resonance of the plasmonic unit cells through diffraction coupling contributes to the revealed resonant 38% circular dichroism effect. The circular dichroism enhancement is achieved through deep-learning-assisted optimization of the metasurface design.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Chemistry, Physical
Alexander A. Tonkikh, Dmitry Rybkovskiy, Elena D. Obraztsova
Summary: We conducted experiments on the charge-induced transformation of linear 1D-iodine structures inside single-walled carbon nanotubes. By using a supercapacitor-type electrochemical cell, we controlled the charging of iodide-filled nanotube electrodes. In situ Raman study confirmed the change in anion types, with electronic doping leading to the growth of I-3(-) anions and suppression of I-5(-) anions.
JOURNAL OF PHYSICAL CHEMISTRY C
(2023)
Article
Physics, Condensed Matter
Artem B. B. Loginov, Pavel V. Fedotov, Sofya N. N. Bokova-Sirosh, Ivan Sapkov, Dmitry N. N. Chmelenin, Rinat R. R. Ismagilov, Elena D. D. Obraztsova, Boris A. A. Loginov, Alexander N. N. Obraztsov
Summary: The production and characterization of molybdenum disulfide (MoS2) and other transition metal dichalcogenide materials with pronounced two-dimensional electronic properties are attracting significant attention in the scientific community. This study presents the synthesis of MoS2 films by chemical vapor deposition using gaseous hydrogen sulfide (H2S) containing thermally evaporated molybdenum (Mo). The films consist of nanometer-thick flake-like crystallites assembled parallel to the substrate surface. Film morphology was found to be dependent on deposition time, substrate temperature, and precursor composition. Raman spectroscopy and electron microscopy analysis confirmed the presence of mono- and bilayered structures in the film. The films exhibited increased photoluminescence (PL) efficiency compared to monolayer MoS2 crystallites, making them promising for electronic and photonic applications.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
Avulu Vinod Kumar, Evgeniy Mamonov, Tatiana Murzina, Rajadurai Chandrasekar
Summary: The success of silicon photonics lies in the ability to simultaneously design, simulate, and construct optical components and their performance. However, the poor mechanical compliance of Si-based materials requires alternative photonic materials. The recent development of mechanically flexible organic waveguides as reliable platforms for photonic materials shows great promise. In this study, a race-track type resonator based add-drop filter (ADF) was designed and fabricated using elastically bendable 9,10-dibromoanthracene (DBA) crystals. The elastic DBA microcrystals, exhibiting pseudo-plasticity on a substrate, facilitated the fabrication of the race-track type resonator and ADF through mechanophotonics technique. Photonic investigations of the circuit demonstrated its spectral filtering ability. Experimental observations, supported by FDTD modelling, confirmed the unique capabilities of organic optical elements for photonic device applications.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Materials Science, Multidisciplinary
Nikolai Mitetelo, Jada Ravi, Subrata Mondal, Uppari Venkataramudu, Evgeniy Mamonov, Mikhail Popov, Anton Maydykovskiy, Ganapathy Vaitheeswaran, Tatiana Murzina, Rajadurai Chandrasekar
Summary: Organic polar crystals are a promising material platform for achieving unique nonlinear nanophotonic properties. The discovery of tunable continuous-wave second-harmonic generation in a polar electro-mechanical microcrystal cavity provides a breakthrough technology for applications in optical switching, actuation, and sensing.
ADVANCED OPTICAL MATERIALS
(2023)
Article
Optics
Evgeniy A. Mamonov, Irina A. Kolmychek, Anton Maydykovskiy, Nikita S. Gusev, Evgeny Skorokhodov, Sergey A. Gusev, Marina P. Temiryazeva, Tatiana Murzina
Summary: Arrays of metal nanostructures have unique potential as optical nanoantennas and nanosensors, and have attracted much interest. This study uses second harmonic generation (SHG) microscopy to investigate the nonlinear optical (NLO) response of cobalt nanoparticles with different shapes. The nonsymmetric elongated shape of planar nanoparticles and the strong light localization effects lead to enhanced NLO response, including SHG and two-photon fluorescence. The efficiency of SHG in nanoparticles is also found to be sensitive to the polarization of the incident laser beam.
LASER PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Maxim Komlenok, Pavel Pivovarov, Alexey Popovich, Vladimir Cheverikin, Alexey Romshin, Maxim Rybin, Elena Obraztsova
Summary: In this paper, we propose a method to synthesize graphene on epitaxial single-crystal Cu film deposited and recrystallized on a basal-plane sapphire substrate. The optimized conditions result in single-crystal graphene growth over the entire area of copper grains with (111) orientation and record size. The high quality of synthesized graphene is confirmed by Raman spectroscopy, scanning electron microscopy, and sheet resistance measurements.
Article
Physics, Multidisciplinary
A. I. Maydykovskiy, D. A. Apostolov, E. A. Mamonov, D. A. Kopylov, S. A. Dagesyan, T. V. Murzina
Summary: The development and optimization of methods for creating micron and sub-micron functional elements for photonic integrated circuits is a key task in nanophotonics. Two-photon laser lithography is being actively developed to form three-dimensional structures with subwave resolution. This study shows that optimized lithography schemes, spatial filtering of the laser beam, and the introduction of laser dyes into polymer can produce optically homogeneous bulk microstructures with characteristic features down to 300 nm. The capabilities of optimized two-photon laser lithography are demonstrated by the fabrication of ring microcavities and optical waveguides with prism input/output adapters.
Article
Materials Science, Multidisciplinary
V. B. Novikov, A. P. Leontiev, K. S. Napolskii, T. V. Murzina
Summary: The recent development of optics of hyperbolic metamaterials (HMMs) has been driven by their intriguing optical properties, particularly their strong optical nonlocality. In this study, we demonstrate that in metal nanorod-based HMMs, nonlocality leads to fast and slow light effects in the propagation of femtosecond laser pulses in the spectral range near the HMM epsilon-near-zero regime. These effects can be switched by the angle of incidence and light wavelength. We explain that these observed dynamics stem from the zero-transmission points of HMM and phase singularities caused by the destructive interference between the main optical wave and the additional wave mediated by the spatial dispersion of light in the HMMs.
Article
Physics, Condensed Matter
V. V. Radovskaya, A. Maydykovskiy, V. B. Novikov, D. A. Kopylov, I. A. Kolmychek, N. S. Gusev, I. Yu Pashen'kin, T. Murzina
Summary: This article reports on experimental investigations of optical second harmonic generation and magnetooptical effects in thin films. The authors observe the shift of hysteresis loops under linear magnetooptical Kerr effect due to exchange coupling, and find that this effect is less pronounced in nonlinear magnetooptical Kerr effect at the second harmonic response. They also discover that the magnetic field dependence of second harmonic intensity is influenced by the power of laser pumping radiation.
PHYSICS OF THE SOLID STATE
(2022)
