Article
Physics, Multidisciplinary
Qiuming Zeng, Yi Huang, Shuncong Zhong, Tingling Lin, Yujie Zhong, Zhenghao Zhang, Yingjie Yu, Zhike Peng
Summary: This paper proposes a bilayer metamaterial for realizing broadband transmission in a terahertz filter. The study finds that compared to traditional monolayer structures, the bilayer metamaterial can generate additional transmission peaks, and the bandwidth can be regulated by adjusting the spacing between layers. Experimental results demonstrate that this design has excellent frequency selective performance.
FRONTIERS IN PHYSICS
(2022)
Article
Physics, Multidisciplinary
Mengchao Guo, Xiaokun Wang, Haiyan Zhuang, Dongming Tang, Baoshan Zhang, Yi Yang
Summary: In this paper, high-contrast gratings based spoof surface plasmon polaritons (HCG-based SSPPs) are used to enhance the bandwidth of all-dielectric metamaterial absorbers (ADMMAs). A carbon black composite is used to design a broadband ADMMA, which consists of a cylinder array structure. Simulation results show that a broadband absorption from 6.1 GHz to 18 GHz is achieved with three absorption peaks under a total thickness of 3.9 mm. The first peak is attributed to HCG-based SSPPs, while the other two are attributed to diffraction effects. The improved impedance matching characteristic in a wide band also contributes to the enhancement. Experimental results roughly agree with the simulations. Moreover, the designed structure is not a standard HCG, indicating the potential universality of HCG-based SSPPs in ADMMAs. It is believed that this work will stimulate further research on the applications of HCG-based SSPPs in ADMMAs.
Article
Physics, Applied
Zhikai Qiu, Yu Xia, Baiyun Wang, Yujie Hua, Weihan Li, Wenxuan Tang, Tie Jun Cui
Summary: This paper presents a microfluidic sensor using spiral resonators and plasmonic metamaterials, which can detect changes in electromagnetic response in real time and obtain material properties with low liquid consumption, high sensitivity, and low cost.
JOURNAL OF PHYSICS D-APPLIED PHYSICS
(2022)
Article
Optics
Qiang Zhang, Zhenwei Xie, Peng Shi, Hui Yang, Hairong He, Luping Du, Xiaocong Yuan
Summary: This article investigates the dynamic modulation of optical skyrmions by changing the field symmetry and adding chirality. The study reveals that field symmetry controls the transformation between skyrmions and merons, while material chirality regulates the degree of twist in the fields and spins, and governs the skyrmionic transition. The enantioselective twist of skyrmions and merons arises from the chirality-induced splitting of the hyperboloid in momentum space. The research enriches the portfolio of optical quasiparticles and deepens our understanding of light-matter interaction, paving the way for applications such as chiral sensing, optical tweezing, and topological phase transitions in quantum matter.
PHOTONICS RESEARCH
(2022)
Article
Optics
J. P. Trevino, V. Coello, A. James-Najera, S. Chavez-Cerda, J. E. Gomez-Correa
Summary: This work reports the observation of 2D longitudinal aberrated wavefields by mapping the intensity distributions of surface plasmon polaritons (SPPs) propagating on a metal/air interface. The SPP beam orientation can be adjusted to mimic aberrated beams, showing Seidel terms such as defocus, spherical, coma, and tilt aberrations. This approach provides a visual and rapid examination of the longitudinal evolution of aberrated beams compared to more complicated post-processing reconstructions.
PHOTONICS RESEARCH
(2023)
Article
Materials Science, Multidisciplinary
Yue Liu, Yu-Yao Cheng, Wen-Zhuang Ma, Yong-Chang Wu, Dan Meng, Yu-Shan Chen, Jing Liu, Yu Gu
Summary: This study developed a multiband metamaterial-absorbing device using an array of gold nano-crosses to absorb visible to near-infrared wavelengths. The device achieved five-band absorption in the 700-3000 nm range, with three peaks reaching 99% absorption and an average absorption of 96.4% after parameter adjustment and optimization. The device also functioned as a biosensor for virus identification and showed potential for designing ideal absorbers and nanosensors.
RESULTS IN PHYSICS
(2023)
Article
Chemistry, Physical
Volodymyr Fesenko, Vladimir R. Tuz
Summary: The study examines the suitability of using In2-xCrxO3 magnetic semiconductor as a constitutive material for producing nanowires supporting propagation of surface plasmon modes. It is demonstrated that the TE0 mode of surface plasmons has low-frequency and high-frequency cut-offs and can be propagated over a large distance.
Article
Chemistry, Physical
M. Saeed, Majeed A. S. Alkanhal, A. Ghaffar, Ali H. Alqahtani, Y. Khan
Summary: The study investigated the characteristics of hybrid surface plasmon modes in a double-layer graphene cylindrical waveguide filled with metamaterials. It was found that the coexistence of double layers of graphene along with metamaterials allows for better control and tuning of the propagation of surface waves.
Article
Optics
Wanqi Zhao, Yu Cheng, Ming Chen, Shijie Deng, Houquan Liu, Chuanxin Teng, Hongyan Yang, Hongchang Deng, Libo Yuan
Summary: This paper proposes an accompanying waveguide coupling structure of micro/nano fibers and studies the excitation and coupling characteristics of surface plasmon polaritons (SPPs) through numerical simulations. The optimal coupling enhancement configuration is obtained, and structures resembling interferometric devices can be designed, providing new insights for high-performance miniaturized devices.
Article
Physics, Multidisciplinary
Tatjana Gric
Summary: This study explores the dispersion tuning of layered materials and the design properties of metamaterials, as well as the challenges in nanostructured metamaterials. By considering two-layered and multilayered composites and analyzing the variation of graphene dielectric functions, the dispersion properties and propagation lengths of SPPs were successfully estimated.
WAVES IN RANDOM AND COMPLEX MEDIA
(2021)
Article
Optics
Ali Tehranian, Mehdi Ahmadi-Boroujeni, Afshin Abbaszadeh
Summary: In this paper, a novel waveguide structure capable of supporting highly confined spoof surface plasmonic (SSP) mode with lower propagation loss is proposed. By analyzing the 2D and 3D structures of the waveguide, it is found that a subwavelength cross-sectional size waveguiding structure with high field confinement and low propagation loss can be achieved if the gap region is properly designed.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Optics
Yulu Qin, Boyu Ji, Xiaowei Song, Jingquan Lin
Summary: The study achieved ultrafast spatiotemporal control of the launch direction of SPP through a plasmonic nano directional coupler; experimental results showed that the extinction ratio of the SPP directional coupler can be optimized by adjusting the amplitude and time delay of the incident light pulses; by adjusting the polarization state of the excitation light, the launch direction of the SPP field can be switched on the femtosecond timescale.
PHOTONICS RESEARCH
(2021)
Article
Chemistry, Multidisciplinary
Olga V. Borovkova, Saveliy V. Lutsenko, Mikhail A. Kozhaev, Andrey N. Kalish, Vladimir I. Belotelov
Summary: A method of spectrally selective detection of short spin waves using the transverse magneto-optical intensity effect in a magnetoplasmonic nanostructure is proposed. The method is based on analyzing the modulation of the sample magnetization caused by the spin wave and the related spatial symmetry breaking in the magnetic layer. The study reveals that the magnitude of the magneto-optical effect varies periodically depending on the spatial shift of the spin wave with respect to the plasmonic grating, allowing for the detection of spin waves of a certain wavelength in a nanostructure.
Article
Chemistry, Multidisciplinary
Thanos Ioannidis, Tatjana Gric, Edik Rafailov
Summary: The study investigates the dispersion properties of SPPs propagating at the interfaces of composite media, showing that material conductivity, filling ratio of nanoparticles, and dielectric properties significantly affect the characteristics of the SPPs. The research provides insight into the behavior of SPPs in complex conductivity plane and offers options to engineer the fundamental features of SPPs at the boundaries of composite media.
APPLIED SCIENCES-BASEL
(2021)
Article
Multidisciplinary Sciences
Hong Zhou, Zhihao Ren, Dongxiao Li, Cheng Xu, Xiaojing Mu, Chengkuo Lee
Summary: The failure of molecular identification due to the overlap of infrared vibrational fingerprints is a fundamental issue in infrared spectroscopy. This study investigates the coupling mode of localized surface plasmon and surface phonon polaritons to disentangle overlapping vibrational modes. The researchers find that the refractive index dependence of surface phonon polaritons vibrations effectively achieves high identification accuracy for strongly overlapping vibrational modes.
NATURE COMMUNICATIONS
(2023)
Article
Engineering, Electrical & Electronic
Nikolai B. B. Chichkov, Paulami Ray, Solenn Cozic, Amit Yadav, Franck Joulain, Semyon V. V. Smirnov, Ulf Hinze, Samuel Poulain, Edik U. U. Rafailov
Summary: In this study, we investigated the amplification of nanosecond pulses using a single-mode Er-fluoride fibre amplifier. We generated seed pulses at a wavelength of 2790 nm using a PPLN-based optical parametric oscillator (OPO) and a Q-switched Nd:YAG pump laser. The amplified pulses achieved gain values of up to 20 dB, output pulse energies of 52.7 mu J, and peak powers of more than 8 kW.
IEEE PHOTONICS TECHNOLOGY LETTERS
(2023)
Review
Engineering, Electrical & Electronic
Amit Yadav, Nikolai B. Chichkov, Eugene A. Avrutin, Andrei Gorodetsky, Edik U. Rafailov
Summary: Edge-emitting mode-locked quantum-dot (QD) lasers are compact, efficient sources for picosecond and femtosecond pulses and/or broad frequency combs, with direct electrical control and small footprints. Their broad gain bandwidths allow for wavelength-tuning and generation of short laser pulses over a wide range. In recent years, mode-locked QD lasers have been promising tools for low-power applications in ultrafast photonics.
PROGRESS IN QUANTUM ELECTRONICS
(2023)
Article
Chemistry, Analytical
Andrei Fotiadi, Edik Rafailov, Dmitry Korobko, Patrice Megret, Alexander Bykov, Igor Meglinski
Summary: A multimode optical fiber can support the excitation and propagation of a single optical mode, and it can interact with other optical modes through stimulated Brillouin scattering (SBS). In this paper, we present a theoretical framework describing the SBS interaction between two selectively excited optical modes in an acoustically isotropic multimode optical fiber. By using a weakly guiding step-index fiber model, we derive an analytical expression for the spatial distribution of the sound field amplitude and investigate the characteristics of the SBS gain spectra, which describe the interaction between modes of different orders. This research provides insights into the sound propagation effects accompanying SBS in multimode optical fibers and demonstrates their specific contributions to the SBS gain spectrum.
Article
Engineering, Electrical & Electronic
Nikolai B. Chichkov, Amit Yadav, Franck Joulain, Solenn Cozic, Semyon V. Smirnov, Leon Shterengas, Julian Scheuermann, Robert Weih, Johannes Koeth, Sven Hofling, Ulf Hinze, Samuel Poulain, Edik U. Rafailov
Summary: Building upon recent advances in GaSb-based diode lasers and Er-doped fluoride fibre technologies, this article demonstrates the fibre-based amplification of mid infrared diode lasers around 2.78 μm for the first time. The experimental results show output powers up to 0.9 W, pulse durations as short as 20 ns, and pulse repetition rates up to 1 MHz. Additionally, the impact of different fibre end-cap materials on laser performance is analyzed.
IEEE PHOTONICS JOURNAL
(2023)
Article
Pharmacology & Pharmacy
Oxana Semyachkina-Glushkovskaya, Alexander Shirokov, Inna Blokhina, Valeria Telnova, Elena Vodovozova, Anna Alekseeva, Ivan Boldyrev, Ivan Fedosov, Alexander Dubrovsky, Alexandr Khorovodov, Andrey Terskov, Arina Evsukova, Daria Elovenko, Viktoria Adushkina, Maria Tzoy, Ilana Agranovich, Jurgen Kurths, Edik Rafailov
Summary: The blood-brain barrier poses a challenge in delivering cancer drugs to the brain for effective brain tumor treatment. The nasal-brain-lymphatic system is considered as a potential pathway to overcome this barrier. However, the distance for drug delivery is often too short to achieve a therapeutic effect. Therefore, it is crucial to develop technologies to enhance the nose-to-brain delivery of pharmaceuticals. This study demonstrates the successful delivery of liposomes to the mouse brain, specifically reaching glioblastoma, through intranasal delivery. The role of the meningeal pathway in this delivery route is highlighted, and near-infrared photostimulation of the lymphatic vessels is shown to improve the delivery efficiency. These findings suggest the potential of using nanocarriers and near-infrared laser-based therapeutic devices for non-invasive and enhanced intranasal delivery of cancer drugs to the brain tissues.
Article
Pharmacology & Pharmacy
Oxana Semyachkina-Glushkovskaya, Denis Bragin, Olga Bragina, Sergey Socolovski, Alexander Shirokov, Ivan Fedosov, Vasily Ageev, Inna Blokhina, Alexander Dubrovsky, Valeria Telnova, Andrey Terskov, Alexander Khorovodov, Daria Elovenko, Arina Evsukova, Maria Zhoy, Ilana Agranovich, Elena Vodovozova, Anna Alekseeva, Juergen Kurths, Edik Rafailov
Summary: Low-level laser treatment (LLLT) can open the blood-brain barrier (BBB) and improve drug delivery to the brain, which is significant for the treatment of brain diseases.
Article
Engineering, Electrical & Electronic
Andrei Gorodetsky, Denis V. Lavrukhin, Dmitry S. Ponomarev, Semyon V. Smirnov, Amit Yadav, Rustam A. Khabibullin, Edik U. Rafailov
Summary: In this paper, a new approach is presented for enhancing pulsed terahertz (THz) generation in quantum dot (QD) based photoconductive antennas (PCA). The combination of a QD substrate based PCA and an interdigitated electrodes topology enables the photocarriers to contribute to THz emission in a quasi-ballistic regime, leading to a 50-fold increase in THz power. The unique properties of QD substrates, such as high electric and thermal breakdown ruggedness, high carrier mobility, and short carrier lifetimes, make this solution favorable for the development of compact THz emitters.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Viktor Dremin, Oxana Semyachkina-Glushkovskaya, Edik Rafailov
Summary: In recent years, there has been a growing interest in the role of singlet oxygen as a regulator of cellular functions. The use of photosensitisers is a common method to generate singlet oxygen by exciting the triplet form of oxygen. However, recent studies have shown the possibility of directly exciting the main form of oxygen into its singlet state using specific wavelengths of light. This review article focuses on the application of a 1267 nm wavelength for the direct optical generation of singlet oxygen. It discusses the biomedical applications of laser-induced singlet oxygen at both cellular and organism levels, including its therapeutic effects on cancer cells and its stimulation of neurons, as well as the vascular and lymphatic systems.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Electrical & Electronic
Diana Galiakhmetova, Viktor Dremin, Aleksandr Koviarov, Dmitrii Stoliarov, Neville Ngum, Raghavan Chinnambedu Murugesan, Rheinallt Parri, Sergei Sokolovski, Edik U. Rafailov
Summary: This study presents the efficiency of ultra-short pulsed (USP) lasers in propagating through the skin, skull, and brain tissues of mice. The results demonstrate that USP lasers can provide sufficient power for non-linear activation of opsins/phytochromes in the brain of living animals.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Engineering, Biomedical
Evgeny A. Zherebtsov, Elena V. Zharkikh, Yulia I. Loktionova, Angelina I. Zherebtsova, Victor V. Sidorov, Edik U. Rafailov, Andrey V. Dunaev
Summary: This article presents clinical results of wireless portable dynamic light scattering sensors that implement laser Doppler flowmetry signal processing. It has been verified that the technology can detect microvascular changes associated with diabetes and ageing in volunteers. Studies were conducted primarily on wrist skin. The wavelet continuous spectrum calculation and autocorrelation parameters were used for analysis. In patients with diabetes, the wavelet spectrum in different frequency ranges and the autocorrelation function showed diagnostic value for identifying microvascular changes. Machine learning algorithms were used to classify different groups, and effective classification metrics were discussed.
IEEE TRANSACTIONS ON BIOMEDICAL ENGINEERING
(2023)
Article
Biochemistry & Molecular Biology
Oxana Semyachkina-Glushkovskaya, Sergey Sokolovski, Ivan Fedosov, Alexander Shirokov, Nikita Navolokin, Alla Bucharskaya, Inna Blokhina, Andrey Terskov, Alexander Dubrovski, Valeria Telnova, Anna Tzven, Maria Tzoy, Arina Evsukova, Daria Zhlatogosrkaya, Viktoria Adushkina, Alexander Dmitrenko, Maria Manzhaeva, Valeria Krupnova, Alessio Noghero, Denis Bragin, Olga Bragina, Ekaterina Borisova, Juergen Kurths, Edik Rafailov
Summary: This study demonstrates the efficacy of photosensitizer-free laser treatment using a quantum-dot-based 1267 nm laser diode in suppressing the growth of glioblastoma (GBM) in rats. The findings suggest that this technology has the potential to be a breakthrough in non-invasive or minimally invasive therapy for superficial GBMs, particularly in infants and patients with high photosensitivity or allergies to photosensitizers.
INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES
(2023)
Article
Optics
D. Stoliarov, I. Kudelin, A. Koviarov, E. Rafailov
Summary: In this study, the Time-Stretch Dispersive Fourier Transform (TS-DFT) method was used to investigate the rapid transient states of an all-polarization-maintaining dispersion-managed figure-eight mode-locked laser with Nonlinear Amplifying Loop Mirror (NALM). The study revealed different stages of build-up dynamics and showed that the mode-locked bound state regime emerges from a single pulse stage following Q-switching (QS), contrary to previous reports. The experimental demonstration of the transient single pulse stage contributes to a better understanding of the dynamics of mode-locked lasers.
OPTICS COMMUNICATIONS
(2023)
Article
Chemistry, Analytical
Irina Makovik, Andrey Vinokurov, Andrey Dunaev, Edik Rafailov, Viktor Dremin
Summary: This study investigates the impact of laser irradiation parameters on the efficiency of singlet oxygen (O-1(2)) generation. Different wavelengths (1267, 1244, 1122, and 1064 nm) were examined, with 1267 nm showing the highest efficiency. Laser exposure time was found to be more effective in generating O-1(2) than increasing power. Additionally, the potential of using the SOSG fluorescence intensity measurement method for in vivo detection of O-1(2) concentrations was explored.
Proceedings Paper
Engineering, Biomedical
Irina Novikova, Andrey Vinokurov, Lybov Eratova, Edik Rafailov, Viktor Dremin
Summary: This study analyzes existing approaches for detecting photosensitizer-free laser-induced singlet oxygen, including their ability to quantitatively measure the relationship between a dose of laser radiation and the amount of singlet oxygen produced.
TRANSLATIONAL BIOPHOTONICS: DIAGNOSTICS AND THERAPEUTICS III
(2023)
Proceedings Paper
Engineering, Biomedical
Diana I. Galiakhmetova, Aleksandr S. Koviarov, Viktor V. Dremm, Andrei A. Gorodetsky, Marios Miumaris, Dmitrii A. Stoliarov, Mikhail Baloban, Vladislav V. Verkhusha, Sergei G. Sokolovski, Edik U. Rafailov
Summary: The ability to control and monitor neurons in vivo using opsins/phytochromes expressed in neural cells has the potential to greatly enhance current medicine. However, a major challenge is the high absorption of visible light in biological tissues, which can be mitigated by photoconversion of phytochromes in spectral ranges with higher tissue transparency. This study demonstrated the two-photon Pr -> Pfr conversion of monomeric phytochrome at 1.2 pm wavelength and compared the linear and nonlinear conversion of truncated DrBphP bacterial phytochromes. It provides structured understanding of the optical properties of phytochrome dimers and monomers, and their potential for use in optogenetics.
TRANSLATIONAL BIOPHOTONICS: DIAGNOSTICS AND THERAPEUTICS III
(2023)
