Article
Optics
M. H. M. Ahmed, W. A. Khaleel, S. A. Sadeq, M. A. W. Abdul Hadi, N. H. Zainol Abidin, M. A. Mahdi
Summary: The stable mode-locked thulium-doped fiber laser (TDFL) using tungsten trioxide (WO3) as a passive saturable absorber on a microfiber demonstrated excellent output parameters and signal-to-noise ratio. The findings suggest that WO3 could be a promising candidate material for saturable absorbers in mid-infrared fiber laser modelocking.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Instruments & Instrumentation
Shaowen Chu, Dalin Sun, Jiaqi Chen, Lang Sun, Wentao Shi, Juan Lu, Xintong Xu, Shuangchen Ruan
Summary: In this study, single-walled carbon nanotubes (SWCNTs) were successfully prepared as the saturable absorber (SA) by pyrolyzing tripropylamine confined in one-dimensional nanochannels. The SWCNTs@AFI SA was transferred onto the end face of a fiber connector and inserted into the fiber laser cavity. Stable mode-locked solitons with 810 fs pulse width, 14.12 MHz repetition rate centered at 1913.6 nm were generated.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Optics
Pei Zhang, Kaharudin Dimyati, Bilal Nizamani, Mustafa M. Najm, Moh Yasin, Sulaiman Wadi Harun
Summary: This study demonstrates the generation of ultrashort pulses in an all-fiber Erbium-doped fiber laser cavity using a doped fiber saturable absorber. The experimental results show that utilizing the saturable absorber can achieve stable mode-locked pulse trains with the potential for power enhancement.
OPTICS AND LASER TECHNOLOGY
(2022)
Article
Optics
Hou Shaodong, Lu Chengjin, Lin Haifeng, Wang Jinzhang, Guo Chunyu, Cheng Jianqun, Zhang Min, Yan Peiguang
Summary: This study presents the nonlinear absorption of three Sb-related materials in the 2 μm waveband, showing their potential for use in photonic devices requiring ultrafast optical switching and modulation. The materials exhibited stable pulse durations, output powers, and signal-to-noise ratios, indicating their suitability for applications in Tm-doped fiber lasers.
Article
Materials Science, Multidisciplinary
M. H. M. Ahmed, N. Mohd Yusoff, C. A. Che Abdullah, M. T. Alresheedi, N. S. Rosli, Z. A. Talib, M. A. Mahdi
Summary: The potential of nanosized titanium dioxide (TiO2) in forming ultrashort pulses using a ring cavity thulium-doped fiber laser is demonstrated in this study. The TiO2 polymer composite acts as a light-absorbing material, saturable absorber (SA), showing nonlinear transmission characteristics with 3.8% modulation depth and 17 MW/cm(2) saturation intensity at 1.92 mu m wavelength.
RESULTS IN PHYSICS
(2021)
Article
Instruments & Instrumentation
Yatao Yang, Feng Jiang, Qiong Zeng, Ke Wang, Zhenhong Wang, Yufeng Song
Summary: We present a thulium-doped multi-wavelength mode-locked fiber laser using a single-mode-gradient refractive index multimode-single-mode fiber (SMF-GIMFSMF) structure acting as a filter and saturable absorber. By utilizing the multimode interference effect (MMI) filtering, wavelength-tunable operation with a range of up to 15.69 nm is achieved. Additionally, by adjusting the pump power and polarization controller, tunable multi-wavelength continuous wave (CW) laser output of up to four wavelengths can be obtained. The all-fiber SMF-GIMF-SMF structure proves to be a crucial device for achieving multi-wavelength and mode-locked pulse output in fiber lasers, with potential applications in nonlinear microscopy, biodegradable material processing, and terahertz spectroscopy.
INFRARED PHYSICS & TECHNOLOGY
(2023)
Article
Optics
Xiaohui Ma, Zhengxiong Zhang, Wenhui Jiang, Liang Tong, Shaoqing Liu, Wenwen Dai, Wu Chen, Yong Zhou, Wei Zhang, Jihong Qiu, Meisong Liao, Weiqing Gao
Summary: In this study, tin selenide nanoparticles were utilized as a saturable absorber in a passively mode-locked thulium-doped fiber laser for the first time, producing mode-locked pulses with excellent performance. The results demonstrate the wide potential applications of tin selenide in ultrafast photonics in the mid-infrared waveband.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Crystallography
Hazlihan Haris, Malathy Batumalay, Tan Sin Jin, Ahmad Razif Muhammad, Arni Munira Markom, Muhamad Hakim Izani, Megat Muhammad Ikhsan Megat Hasnan, Ismail Saad
Summary: A continuous-wave infrared radiation source utilizing bismuth telluride (Bi2Te3) nanosheet saturable absorbers has been successfully developed, showcasing high efficiency and a wide range of accessible wavelengths. The mode-locking pulses generated demonstrate strong stability and high power output.
Article
Engineering, Electrical & Electronic
Harith Ahmad, Ahmad Izzat Mohd Hanafi, Rizal Ramli, Siti Aisyah Reduan, Norazriena Yusoff
Summary: A novel method for passively mode-locking pulse generation in a THDFL system using MoWS2-rGO nanocomposite as a saturable absorber was demonstrated. The THDFL produces mode-locked pulses with a pulse duration of 1.5 ps, showing excellent stability and potential applications in various fields, especially in medicine.
OPTICAL FIBER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Harith Ahmad, Azim Danial Azam, Muhamad Zharif Samion, Siti Aisyah Reduan, Norazriena Yusoff, Mohammad Faizal Ismail
Summary: In this work, the demonstration of iron phosphate trisulfide (FePS3) as a saturable absorber (SA) for mode-locked pulse generation in a thulium-doped fluoride fiber (TDFF) laser was presented. The integrated FePS3 SA showed a high signal-to-noise ratio and a high laser output power.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Chemistry, Multidisciplinary
Arni Munira Markom, Nurul Athirah Mohamad Abdul Ghafar, Malathy Batumalay, Yusrina Yusof, Ahmad Haziq Aiman Rosol, Nur Farhanah Zulkipli, Ahmad Razif Muhammad, Hazlihan Haris, Ismail Saad, Sulaiman Wadi Harun
Summary: We developed an erbium-doped fiber-based saturable absorber (SA) using niobium aluminium carbide (Nb2AlC) nanomaterial, which can generate stable mode-locked pulses. The SA was fabricated with polyvinyl alcohol (PVA) and the Nb2AlC nanomaterial, producing pulses operating at 1530 nm with a repetition rate of 1 MHz and pulse width of 6.375 ps. A peak pulse energy of 7.43 nJ was achieved at 175.87 mW pump power. This study not only provides design suggestions for SAs based on MAX phase materials but also demonstrates the great potential of MAX phase materials for generating ultra-short laser pulses.
Article
Biochemistry & Molecular Biology
Qiongyu Hu, Xiaohan Chen, Ming Li, Ping Li, Liwei Xu, Haoxu Zhao, Bin Zhang, Jing Liu, Kejian Yang
Summary: In this study, antimony trisulfide was successfully prepared and embedded into polyvinyl alcohol as a saturable absorber in a passively mode-locked Er-doped fiber laser. The results showed that the Sb2S3-PVA SA exhibited excellent stability and performance, indicating promising potentials in ultrafast all-fiber lasers.
Article
Chemistry, Multidisciplinary
Ruyi Sun, Linguang Guo, Xinxin Shang, Huanian Zhang, Qingyang Yue
Summary: A ferromagnetic insulator Cr2Ge2Te6 was fabricated and utilized as a saturable absorber in an Er-doped fiber laser. The experimental results demonstrated that Cr2Ge2Te6 exhibits outstanding nonlinear absorption properties and can generate stable pulses.
Article
Optics
Ximei Liu, Mengli Liu, Yaorong Wang, Kai Huang, Ming Lei, Wenjun Liu, Zhiyi Wei
Summary: By using cobalt oxyfluoride as the nonlinear material, a stable 156 fs mode-locked fiber laser with a repetition rate of 49 MHz and a signal-to-noise ratio of about 90 dB was achieved. This research confirms the attractive nonlinear optical properties of CoOF and establishes a foundation for ultrafast applications of low-dimensional transition metal oxides.
CHINESE OPTICS LETTERS
(2021)
Article
Optics
Harith Ahmad, Nur Atikah Azali, Leonard Bayang, Norazriena Yusoff
Summary: An all-fiber passively mode-locked laser operating at a wavelength near 2.0 μm is demonstrated using thulium/holmium-doped fiber as the gain medium and bismuthene/side-polished fiber (SPF) as the saturable absorber (SA). The study investigates the effect of bismuthene concentration on the performance of the generated mode-locked lasers. It is found that a 10 mg/ml bismuthene/SPF SA induces the most stable and high-performance mode-locked pulses.
LASER PHYSICS LETTERS
(2022)
Article
Optics
N. R. Arutyunyan, D. Rybkovskiy, E. A. Obraztsova, E. D. Obraztsova
Summary: Thin layers of gallium selenide (GaSe) were fabricated on Si:SiO2 substrates by micromechanical exfoliation, with size-induced effects observed. The photoluminescence maximum associated with direct free exciton transition shifts to higher energies as the GaSe crystal thickness decreases, indicating changes in bandgap value. Additionally, the appearance of Raman spectra features corresponding to various compounds in thin GaSe flakes suggests thermal and photo-induced oxidation of the GaSe layers.
JOURNAL OF LUMINESCENCE
(2022)
Article
Optics
Mariya Ponarina, Andrey Okhrimchuk, Timophey Dolmatov, Maxim Rybin, Elena Obraztsova, Vladimir Bukin, Petr Obraztsov
Summary: A single-wavelength compact diode-pumped solid-state laser using a single-mode waveguide and graphene saturable absorber was presented in this study. Stable continuous wave passive mode-locking at a wavelength of 1064 nm with a pulse repetition rate of 9.5 GHz was achieved by controlling intracavity losses accurately.
LASER PHYSICS LETTERS
(2022)
Article
Chemistry, Multidisciplinary
Denis M. Krichevsky, Lei Shi, Vladimir S. Baturin, Dmitry Rybkovsky, Yangliu Wu, Pavel Fedotov, Elena D. Obraztsova, Pavel O. Kapralov, Polina Shilina, Kayleigh Fung, Craig T. Stoppiello, Vladimir Belotelov, Andrei Khlobystov, Alexander Chernov
Summary: Molecular magnetism and magnetic molecules have received attention for their importance in quantum technologies, information processing, and spintronics. Researchers have synthesized cobalt-phthalocyanine based nanoribbons encapsulated in SWCNTs, confirming their properties using various techniques and observing magnetic differences. This approach is expected to provide a diverse class of protected low-dimensional ordered magnetic materials for various applications.
Article
Nanoscience & Nanotechnology
N. P. Stepina, V. A. Golyashov, A. Nenashev, O. E. Tereshchenko, K. A. Kokh, V. V. Kirienko, E. S. Koptev, E. S. Goldyreva, M. G. Rybin, E. D. Obraztsova, I. Antonova
Summary: The research found that the main contribution to the conductance of Bi2Se3 thin films grown on graphene comes from bulk states, while magnetoresistance is influenced by both surface and bulk states. A transition from weak antilocalization to weak localization is observed as the film thickness decreases. Band bending on both interfaces explains the contribution to weak antilocalization from different surfaces at different TI film thicknesses.
PHYSICA E-LOW-DIMENSIONAL SYSTEMS & NANOSTRUCTURES
(2022)
Article
Physics, Condensed Matter
Pavel Vladimirovich Fedotov, Dmitry Rybkovskiy, Ivan Novikov, Elena D. Obraztsova
Summary: Narrow graphene nanoribbons (GNRs) with atomically precise structure are interesting nanomaterials with promising applications. However, due to the difficulty of their production, the optical properties of GNRs are rarely studied. In this paper, a new bottom-up method based on chemical vapor deposition is reported to scale up the production of 3-armchair GNRs (3-AGNRs). Experimental measurements confirm the high quality and wide optical bandgap of the produced GNRs.
PHYSICA STATUS SOLIDI B-BASIC SOLID STATE PHYSICS
(2022)
Article
Materials Science, Multidisciplinary
Anna A. Popkova, Aleksandr A. Chezhegov, Maxim G. Rybin, Irina Soboleva, Elena D. Obraztsova, Vladimir O. Bessonov, Andrey A. Fedyanin
Summary: This study demonstrates the potential of utilizing Bloch surface waves (BSWs) to enhance the interaction between graphene and light for all-optical switching. By placing a graphene monolayer on top of a 1D photonic crystal, significant modulation of the reflection coefficient is achieved on a sub-picosecond time scale, showing promise for the development of all-optical switches.
ADVANCED OPTICAL MATERIALS
(2022)
Article
Chemistry, Physical
Vera R. Islamova, Maxim G. Rybin, Alexander A. Tonkikh, Ivan I. Kondrashov, Eugeny A. Guberna, Van Chuc Nguyen, Elena D. Obraztsova
Summary: In this study, the Fermi level of chemically vapor-deposited graphene was controlled using a non-destructive and effective method based on thermochemical deposition of a doping substance. Both p- and n-type dopings of graphene were achieved using cobaltocene and iron chloride dopants, respectively, with a maximum shift of 0.5 eV.
JOURNAL OF PHYSICAL CHEMISTRY C
(2022)
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
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
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
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
Materials Science, Biomaterials
Yan-Yi Chen, Darwin Kurniawan, Seyyed Mojtaba Mousavi, Pavel V. Fedotov, Elena D. Obraztsova, Wei-Hung Chiang
Summary: The conversion of chitosan into nitrogen-doped graphene quantum dots (NGQDs) using an atmospheric pressure microplasma system enables the selective detection of cancer and neurotransmitter biomarkers. By adjusting the pH conditions, multiple biomolecules can be simultaneously detected with high selectivity and sensitivity, showing linear relationships between biomarker concentration and photoluminescence (PL) intensity ratio.
JOURNAL OF MATERIALS CHEMISTRY B
(2022)
