Article
Multidisciplinary Sciences
Fardin Ghorbani, Sina Beyraghi, Javad Shabanpour, Homayoon Oraizi, Hossein Soleimani, Mohammad Soleimani
Summary: Using Deep Neural Network (DNN), an inverse design procedure for metasurface was proposed in this research, achieving high accuracy above 91% while significantly reducing computational time. The model based on DNN satisfactorily generated the output metasurface structures with an average accuracy of over 90% in both network architectures, providing an effective platform for engineering projects without the need for complex electromagnetic theory.
SCIENTIFIC REPORTS
(2021)
Article
Engineering, Electrical & Electronic
Xuejun Lian, Mengting Ma, Jinping Tian, Rongcao Yang, Xiaoting Wu
Summary: Achieving switchable and reconfigurable functions based on a single metasurface using vanadium dioxide (VO2) has become a hot topic among researchers. A THz bifunctional metasurface device (BMD) is designed, utilizing the phase transition properties of VO2, that can provide broadband absorption and cross-polarization conversion. The BMD acts as a broadband metamaterial absorber (MA) in the metallic state of VO2, with absorption greater than 90% in the range of 1.97-4.63 THz, and as a broadband linear polarization converter (PC) in the insulated state of VO2, with a polarization conversion ratio greater than 90% in the range of 1.54-4.18 THz. The proposed BMD shows excellent absorption and polarization conversion characteristics, making it highly valuable in various THz applications with sub-wavelength device scales.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Optics
Yuanyuan Bai, Chunmei Ouyang, Shoujun Zhang, Zhibo Yao, Kuan Liu, Shilei Liu, Jiajun Ma, Yanfeng Li, Tun Cao, Zhen Tian
Summary: In this study, an actively controllable GST-based metamaterial device is proposed and demonstrated, where the functionality is experimentally verified by inducing the crystallization process with thermal activation. Cross-polarization conversion in the reflection mode and circular-to-linear polarization conversion in the transmission mode are achieved under crystalline and amorphous GST conditions, respectively.
Article
Engineering, Electrical & Electronic
Ololade M. Sanusi, Ying Wang, Langis Roy
Summary: This paper presents a multifunctional reconfigurable metasurface based on liquid metal injection. The metasurface is formed by two switchable microfluidic layers and can be reconfigured into different states, exhibiting different properties. Experimental results confirm the polarization conversion performance of the metasurface, making it suitable for modern integrated antenna array systems.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2022)
Article
Multidisciplinary Sciences
Aykut Coskun, Ugur Cem Hasar, Ahmet Ozmen, Mehmet Ertugrul
Summary: This article presents a design of an ultrathin, broadband, and multipurpose polarization converter for K and Ka band using an anisotropic metasurface. The proposed converter can convert both circular polarization and linear polarization to circular polarization, with a polarization conversion rate of over 90% in the frequency range from 17.87 to 43.15 GHz, covering all K and Ka bands.
ADVANCED THEORY AND SIMULATIONS
(2022)
Article
Computer Science, Information Systems
Fengan Li, Baiqiang You
Summary: This paper presents a metasurface composed of complementary units that can achieve orthogonal linear and linear-to-circular polarization conversion in multiple frequency bands. The research results demonstrate that polarization conversion can be achieved in both high-conversion frequency bands and frequency bands with axial ratios less than 3 dB.
Article
Multidisciplinary Sciences
Saeedeh Ahadi, Mohammad Neshat, Mohammad Kazem Moravvej-Farshi
Summary: The study proposes a terahertz modulator based on split-ring resonators, achieving signal modulation through adjustment of bias voltage. The modulator excites LC resonances or dipole resonances at different frequencies under different voltages, with modulation depths reaching 45% to 87%.
SCIENTIFIC REPORTS
(2022)
Article
Materials Science, Multidisciplinary
Ayesha Kosar Fahad, Cunjun Ruan, Rabia Nazir, Muhammad Taskeen Raza
Summary: This work demonstrates the design, fabrication, and experimental verification of a triple band linear to circular polarization converter operating multiple functions of transmission and reflection. The device, based on a single substrate-layered metasurfaces structure, performs linear to circular polarization conversion in the frequency ranges of 12.95-14.85 GHz, 24.89-32.75 GHz, and 44.9-52.5 GHz for transmission, and 13.32-15.6 GHz, 26.5-32.6 GHz, and 45.85-53.5 GHz for reflection.
RESULTS IN PHYSICS
(2023)
Article
Computer Science, Interdisciplinary Applications
Jialin Feng, Hongyu Shi, Luyi Wang, Jianjia Yi, Anxue Zhang, Zhuo Xu
Summary: In this paper, a coupling-propagation-decoupling unit cell is designed to independently manipulate the transmission phase and polarization of a linearly polarized electromagnetic wave. Two 1-bit transmissive coding metasurfaces are proposed to efficiently realize wavefront control and linear-to-circular polarization conversion.
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2022)
Article
Materials Science, Multidisciplinary
Xuejun Lian, Mengting Ma, Jinping Tian, Rongcao Yang
Summary: This paper presents a switchable metamaterial device with dual function based on vanadium dioxide (VO2) and graphene. VO2 can transition from the insulating state to the metallic state under external stimulation, and graphene's conductivity can be controlled by adjusting its bias voltage. The research results show that this device outperforms some of the reported devices in the literature.
DIAMOND AND RELATED MATERIALS
(2023)
Article
Engineering, Electrical & Electronic
Mengting Ma, Xuejun Lian, Jinping Tian, Rongcao Yang
Summary: A novel tunable metamaterial device with functions of broadband absorption and broadband polarization conversion is constructed based on the phase transition properties of vanadium dioxide (VO2). The proposed device operates in the broadband absorption mode when VO2 is in the metallic state, achieving more than 90% absorbance with a relative bandwidth of 76.9% in the frequency range of 1.80 - 4.05 THz. In the insulating state, it operates in the broadband polarization conversion mode, efficiently converting the incident linearly polarized terahertz (THz) wave into its cross-polarized state in the frequency range of 1.68 - 3.79 THz, with a polarization conversion ratio (PCR) above 90% and a relative conversion bandwidth larger than 77.1%. This VO2-based dual-functional metamaterial device has potential applications in various THz areas, such as absorption, polarization conversion, and imaging, due to its acceptable tolerance of incident angles and polarization angles.
AEU-INTERNATIONAL JOURNAL OF ELECTRONICS AND COMMUNICATIONS
(2023)
Article
Optics
Oznur Turkmen-Kucuksari
Summary: In this study, a reflective multi-functional metamaterial polarization converter is designed by printing two connected metal rings and two unconnected metal square patches on a metal backed FR4 sub-strate. The polarizer operates at a frequency starting from 2.41 GHz. It achieves linear to linear (LTL) polarization conversion in three bands and linear to circular (LTC) polarization conversion in seven bands.
Article
Engineering, Electrical & Electronic
Xiang Tao, Limei Qi, Jun Yang, Junaid Ahmed Uqaili, Feng Lan, Ziqiang Yang
Summary: In this article, a bifunctional terahertz (THz) metasurface is experimentally demonstrated to achieve broadband linear-to-circular polarization conversion (LCPC) and linear polarization conversion (LPC) in two different bands. The LCPC in the lower band from 0.34 to 0.48 THz has a measured 3-dB axial ratio relative bandwidth of 34.2%, while the LPC in the higher band from 0.53 to 0.85 THz has a measured polarization conversion ratio over 80%. The physical mechanism of LCPC and LPC is explained by the surface current distribution and further discussed using the multiple interference model. This bifunctional THz metasurface polarization converter has promising applications in THz systems, communications, spectroscopy, etc., and the design strategy can also be extended to microwave and millimeter bands.
IEEE TRANSACTIONS ON TERAHERTZ SCIENCE AND TECHNOLOGY
(2023)
Article
Engineering, Electrical & Electronic
Yunus Kaya
Summary: This article presents a single-layer, ultra-thin and multifunctional polarization converter (PC) design using metasurface. The suggested PC features linear polarization (LP) characteristic within certain frequency ranges and it can convert LP to circular polarization (CP) with a high conversion ratio. The PC design has been tested and validated through measurements and simulations.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Multidisciplinary Sciences
Zhuo Yue Li, Si Jia Li, Bo Wen Han, Guo Shuai Huang, Ze Xu Guo, Xiang Yu Cao
Summary: The study introduces a quad-band dual-circular transmissive metasurface (QCT-MS) capable of converting linear polarization waves to dual-circular polarization waves, suitable for multiband communication and multifunctional dual-circularly polarized antenna systems.
ADVANCED THEORY AND SIMULATIONS
(2021)
Article
Optics
Liyi Hsu, Fadi Baida, Abdoulaye Ndao
Summary: Optical nanoantennas have the ability to efficiently confine, localize resonance, and significantly enhance electromagnetic fields at a subwavelength scale. By combining optical nanoantennas with Slanted Bound states in the continuum cavities, even stronger confinement can be achieved. The proposed hybrid system demonstrates six orders of magnitude local intensity enhancement, paving the way for applications such as optical trapping, optical sensing, nonlinear optics, and quantum optics.
Article
Optics
Thinhinane Zeghdoudi, Zahia Kebci, Abdelaziz Mezeghrane, Abderrahmane Belkhir, Fadi Issam Baida
Summary: This study designed a half-wave plate based on birefringent metamaterial for operation in the visible range, achieving high transmission coefficients and birefringence through efficiency optimization. This type of anisotropic metasurfaces holds great potential for a wide range of applications in integrated photonics.
OPTICS COMMUNICATIONS
(2021)
Article
Optics
Sabrina Mesli, Hakim Yala, Mahdi Hamidi, Abderrahmane BelKhir, Fadi Issam Baida
Summary: The symmetry breaking in a typical dielectric GMR-grating structure allows the coupling of incident waves with Symmetry-Protected Modes (SPM). In this study, the excitation conditions for these particular modes were investigated, and a parametric study including grating dimensions was carried out to exploit them for blood refractive index sensing with higher Sensitivity (S) and Figure Of Merit (FOM). The performances obtained by FDTD and FMM calculations are the highest level reached, with Q values, sensitivities, and FOM values provided.
Article
Materials Science, Multidisciplinary
Bruno Robert, Venancio Calero, Miguel-Angel Suarez, Roland Salut, Florent Behague, Fadi Baida, Nadege Courjal, Maria-Pilar Bernal
Summary: Lab-on-fiber technology offers high versatility and functionality when combined with different sensitive materials, allowing the production of high-performing sensors. The integration of ultra-compact Photonic Crystal Slab structures into fiber facets can detect electric fields with great linearity and sensitivity.
OPTICAL MATERIALS EXPRESS
(2021)
Article
Materials Science, Multidisciplinary
Harpreet Kaur, Rajesh Sharma, T. Laurent, J. Torres, P. Nouvel, C. Palermo, L. Varani, Y. Cordier, M. Chmielowska, J-P Faurie, B. Beaumont
Summary: The study investigates the transport measurements of GaN/AlGaN structures to explore the possibility of amplifying terahertz radiations. Different structures, such as HEMT, TLM, and IDF, are investigated, revealing the effects of geometry, temperature, and operating conditions. The results provide valuable information for achieving terahertz amplification in electronic devices.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Optics
Olivia Zurita-Miranda, Coralie Fourcade-Dutin, Frederic Fauquet, Frederic Darracq, Jean-Paul Guillet, Patrick Mounaix, Herve Maillotte, Damien Bigourd
Summary: This paper investigates the four-wave mixing process in a gas-filled hollow-core capillary in the femtosecond regime through numerical and experimental studies. The interaction between a visible broadband continuum and a chirped pump pulse generates a tunable near-infrared pulse with the potential to reach the midinfrared range. Numerical simulations reveal the important role of key parameters such as gas pressure, chirps, and relative delays of the pulses. The experimental results demonstrate the feasibility of the tunable femtosecond source and generate a 1.2 μm idler pulse with a duration of approximately 220 fs at the direct output of the capillary, which can be further reduced to 45 fs with phase compensators.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2022)
Article
Multidisciplinary Sciences
Mathias Lechelon, Yoann Meriguet, Matteo Gori, Sandra Ruffenach, Ilaria Nardecchia, Elena Floriani, Dominique Coquillat, Frederic Teppe, Sebastien Mailfert, Didier Marguet, Pierre Ferrier, Luca Varani, James Sturgis, Jeremie Torres, Marco Pettini
Summary: In this study, the activation of resonant electrodynamic intermolecular forces was experimentally demonstrated using two independent experiments based on different physical effects detected by fluorescence correlation spectroscopy and terahertz spectroscopy, respectively. This discovery has significant implications for our understanding of biomolecular interactions and cellular dynamics.
Article
Optics
S. Gebert, C. Consejo, S. S. Krishtopenko, S. Ruffenach, M. Szola, J. Torres, C. Bray, B. Jouault, M. Orlita, X. Baudry, P. Ballet, S. V. Morozov, V. I. Gavrilenko, N. N. Mikhailov, S. A. Dvoretskii, F. Teppe
Summary: Since the emergence of graphene, proposals for tunable Landau lasers in the terahertz frequency range have been made. Despite the non-equidistance of the Landau levels, a non-radiative process still persists in Landau-quantized graphene. This work demonstrates Landau emission from Dirac fermions in HgTe quantum wells, which can be tuned by both magnetic field and carrier concentration.
Article
Optics
N. Hameed, T. Zeghrane, B. Guichardaz, A. Mezeghrane, M. Suarez, N. Courjal, M. -P Bernal, A. Belkhir, F. Baida
Summary: Advances in optical trapping design principles have led to tremendous progress in manipulating nanoparticles (NPs) with diverse functionalities in different environments using bulky systems. However, efficient control and manipulation of NPs in harsh environments require a careful design of contactless optical tweezers. Here, we propose a simple design of a fibered optical probe allowing the trapping of dielectric NP as well as a transfer of the angular momentum of light to the NP inducing its mechanical rotation.
Article
Optics
Ayman Hoblos, Nadege Courjal, Maria P. Bernal, Fadi I. Baida
Summary: A simple configuration of a lambda/9 thick 2D metallic grating embedded within an electro-optic material is proposed and studied for EO modulation. The grating is used for spatially periodic modification of the electric field and exhibits a Fano-like resonance in the NIR spectral range, leading to enhanced EO effect. Numerical simulations optimize the geometry, achieving high modulation sensitivity and resonance depth, as well as low driving voltage.
Article
Chemistry, Analytical
Barnabe Carre, Adrien Chopard, Jean-Paul Guillet, Frederic Fauquet, Patrick Mounaix, Pierre Gellie
Summary: This paper presents the development, performance, integration, and implementation of a 150 GHz FMCW radar based on a homodyne harmonic mixing scheme for noncontact, nondestructive testing. The system offers high-dynamic-range measurement capabilities up to 100 dB and measurement rates up to 7.62 kHz. The interesting characteristics of this system make it attractive for imaging applications or contactless sensing. Numerous samples of different materials and geometries were imaged, and new applicative fields such as food industry and pharmaceutical packaging were explored, taking into account the nonionizing capability of the system.
Article
Physics, Applied
Fadi Issam Baida, Juan Jose Robayo Yepes, Abdoulaye Ndao
Summary: In this paper, a giant enhancement in both forward and backward propagation of second harmonic generation is proposed and demonstrated numerically by combining high-quality factor cavities of bound states in the continuum and an excellent nonlinear optical crystal of lithium niobate. The enhancement factor is defined as the ratio of second harmonic signal generated by the structure to the signal generated by the lithium niobate membrane alone. The proposed platform opens the way to a new generation of efficient integrated optical sources compatible with nano-photonic devices for classical and quantum applications.
JOURNAL OF APPLIED PHYSICS
(2023)
Article
Materials Science, Multidisciplinary
C. Bray, K. Maussang, C. Consejo, J. A. Delgado-Notario, S. Krishtopenko, S. Gebert, I. Yahniuk, S. Ruffenach, K. Dinar, J. Eroms, K. Indykiewicz, B. Jouault, J. Torres, Y. M. Meziani, W. Knap, A. Yurgens, S. D. Ganichev, F. Teppe
Summary: This article presents extensive experimental studies on the zero-field splittings in monolayer and bilayer graphene. Surprisingly, a decrease of the spin splittings with increasing temperature was observed. The origin of this phenomenon is discussed by considering possible physical mechanisms likely to induce a temperature dependence of the spin-orbit coupling.
Article
Optics
Kosuke Okada, Quentin Cassar, Hironaru Murakami, Gaetan MacGrogan, Jean-Paul Guillet, Patrick Mounaix, Masayoshi Tonouchi, Kazunori Serita
Summary: In this study, an unstained comedo ductal-carcinoma-in-situ, a highly-malignant early-stage breast cancer, was visualized for the first time in terahertz images using a probe-less terahertz near-field microscope. This outcome is a critical step towards the label-free diagnosis of single early stage cancer lesions with terahertz waves.
Article
Optics
Ayman Hoblos, Miguel Suarez, Nadege Courjal, Maria-Pilar Bernal, Fadi Baida
