Article
Nanoscience & Nanotechnology
Baiying Taishi, Yating Yang, Xueqi Wu, Jianchun Xu, Shanguo Huang
Summary: This article presents, optimizes, and measures a novel 3D electrically small antenna with dual-band. The optimized antenna works in 0.789 GHz and 1.183 GHz, showing simulated results similar to measured results, meeting the miniaturization requirements of modern wireless communication systems.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2022)
Article
Engineering, Electrical & Electronic
Ali M. Albishi, Saleh A. Alshebeili, Omar M. Ramahi
Summary: This paper presents a sensitive microwave near-field sensor based on utilizing a three-dimensional capacitor within a planar split-ring resonator, which enhances sensitivity in detecting dielectric fluids. Experimental testing shows higher sensitivity in detecting the presence of chloroform and dichloromethane, as well as changes in fluid levels. The proposed sensor offers improved performance compared to planar resonators, with increased electric field enhancement and higher loaded-quality factor achievable.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Analytical
Angelo Leo, Alessandro Paolo Bramanti, Domenico Giusti, Fabio Quaglia, Giuseppe Maruccio
Summary: This article proposes a novel approach for dynamic microwave modulation using reconfigurable resonant circuits. The approach involves the integration of double split ring resonators (DSRRs) with microelectromechanical actuators (MEMS) for geometrical tuning. Numerical simulations showed a resonance frequency shift of 370 MHz through a 170 μm extrusion driven by a DC voltage. This technology offers potential applications in multiband telecommunications, wireless power transfer, and the IoT field.
Article
Engineering, Electrical & Electronic
Alexandre Chopin, Gabriel Marty, Ines Ghorbel, Gregory Moille, Aude Martin, Sylvain Combrie, Fabrice Raineri, Alfredo De Rossi
Summary: The article discusses the properties of a recently introduced photonic crystal parametric oscillator, which achieves Canonical Resonant Four-Wave-Mixing by allowing only four (three in the degenerate case) modes of the cavity to interact through this parametric process. The study includes a statistical analysis of over 100 resonators and 10 parametric oscillators, assessing their robustness against fabrication tolerances and evaluating their performance in terms of average values and dispersion. The article also highlights the minimum pump power at threshold and the relationship between the cavity photon lifetime and three photon absorption as conditions for parametric oscillation.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2023)
Article
Nanoscience & Nanotechnology
Yifei Xu, Qi Song, Enen Li, Min Zhang, Zhenhua Sun, Tianwu Wang, Fang Liu, Peiguang Yan
Summary: An optical controlled THz modulator is proposed in this study, combining lead sulfide (PbS) quantum dots with subwavelength metallic split-ring resonators (SRRs) to provide field enhancement. The modulation depth reaches 60.3%, which is approximately 3 times larger than the PbS quantum dots film without SRRs (as reference) in the frequency range of 0.1-1.1 THz. The significant enhanced THz modulation is mainly attributed to the local THz field enhancement caused by the SRRs, consistent with the simulation result.
Article
Engineering, Electrical & Electronic
Yazusha Sharma, Rukhsar Zafar, Sanjeev Kumar Metya, Vinay Kanungo
Summary: This study presents a Plasmonic sensor based on coupled split ring resonators, featuring dual Fano resonances, ultra-narrow line width, and high Quality factor. The sensor design shows excellent sensitivity and resolution for optical glucometer applications, as well as potential uses in chemical sensing and various biological applications.
IEEE SENSORS JOURNAL
(2021)
Article
Physics, Applied
Daniel A. Bobylev, Dmitry I. Tikhonenko, Alexander B. Khanikaev, Maxim A. Gorlach, Dmitry V. Zhirihin
Summary: Topological states in a simple square lattice can be tailored by the orientation of non-centrosymmetric split-ring resonators, offering a new design strategy for disorder-robust localization of electromagnetic waves at the edges and corners of photonic structures. Numerical predictions are confirmed experimentally by observing the emergence of nontrivial topological properties and localized edge and corner states.
APPLIED PHYSICS LETTERS
(2023)
Article
Chemistry, Multidisciplinary
Wei Du, Youcheng Zhu, Zhendong Yan, Xiulian Xu, Xiaoyong Xu, Jingguo Hu, Pinggen Cai, Chaojun Tang
Summary: The theoretical study showed that magnetic plasmon resonances (MPRs) in a 3D metamaterial consisting of vertical Au split-ring resonators (VSRRs) array on Au substrate, coupled with propagating surface plasmon polaritons (SPPs), could generate an ultranarrow-band hybrid mode with significantly enhanced magnetic fields on the metal substrate. The proposed metamaterial exhibited high sensitivity (S = 830 nm/RIU) and figure of merit (FOM = 377), suggesting potential for label-free biomedical sensing applications.
Article
Engineering, Electrical & Electronic
Mohamed Amine Zidane, Amar Rouane, Cherif Hamouda, Hichem Amar
Summary: A microwave sensor for glucose concentration measurement is proposed, utilizing a novel configuration of resonators to detect small changes in glucose concentrations in water. Through numerical simulation and experimental study, the sensor demonstrates high sensitivity and accuracy, making it suitable for real-time, non-destructive and cost-effective measurements.
SENSORS AND ACTUATORS A-PHYSICAL
(2021)
Article
Computer Science, Information Systems
Zhonggang Xiong, Liping Shang, Jieping Yang, Linyu Chen, Jin Guo, Quancheng Liu, Samuel Akwasi Danso, Guilin Li
Summary: A novel design of a nearly perfect metamaterial absorber for terahertz sensing applications is proposed, achieving 99% absorptivity at 0.53 THz with high sensitivity and Q-factor. The design exhibits high sensitivity to the refractive index of the surrounding medium and the covering sample thickness, making it suitable for detecting substances of different thicknesses in the terahertz low-frequency band.
Article
Physics, Applied
Rowan S. Parker-Jervis, Sae June Park, John E. Cunningham
Summary: Finite-element methods were used to design and simulate a tunable terahertz band-stop filter based on coupled split-ring resonators integrated into a planar Goubau-line waveguide. Two split-ring resonators with different geometrical lengths and gap widths were designed to resonate at the same frequency, with controlled resonance splitting by adjusting the distance between them. Investigation of the coupling strength of the resonators as a function of relative separation revealed a dispersion relation showing anti-crossing of the coupled resonances as the cantilever bends.
JOURNAL OF APPLIED PHYSICS
(2021)
Article
Chemistry, Multidisciplinary
Akhil Varri, Shabnam Taheriniya, Frank Brueckerhoff-Plueckelmann, Ivonne Bente, Nikolaos Farmakidis, Daniel Bernhardt, Harald Roesner, Maximilian Kruth, Achim Nadzeyka, Torsten Richter, Christopher David Wright, Harish Bhaskaran, Gerhard Wilde, Wolfram H. P. Pernice
Summary: This study demonstrates scalable and non-volatile photonic computational memories using automated silicon ion implantation. Precise spectral trimming of large-scale photonic ensembles is achieved with stability and minimal loss penalty. Spectrally aligned photonic memory and computing systems for general matrix multiplication are showcased, enabling wavelength multiplexed integrated architectures at large scales.
ADVANCED MATERIALS
(2023)
Article
Optics
Yanlu Wang, Zhiping Yang, Mingyu Li, Jian-Jun He, Qiushun Li
Summary: A sensor based on cascaded double ring resonator (CDRR) with a micro-heater for thermal tuning is proposed in this paper. The refractive index change of the sample is converted into the change of electrical power, resulting in a higher sensitivity of the sensor.
CHINESE OPTICS LETTERS
(2022)
Article
Chemistry, Physical
Zacharias Viskadourakis, George Fanourakis, Evangelos Tamiolakis, Anna Theodosi, Klytaimnistra Katsara, Nikolaos Rafael Vrithias, Odysseas Tsilipakos, George Kenanakis
Summary: Rectangular, millimeter-scale complementary split ring resonators were fabricated using the computer numerical control method combined with a home-built mechanical engraver. The dimensions of these resonators were thoroughly investigated in the frequency range of 2-9 GHz, and a good consistency was obtained between experimental results and theoretical simulations. Additionally, the sensing response of these metasurfaces against aqueous solutions enriched with typical fertilizers and commonly used detergents was extensively studied, demonstrating their potential as sensors for water pollution.
Article
Physics, Applied
Victor Lopez-Richard, Rafael Schio Wengenroth Silva, Ovidiu Lipan, Fabian Hartmann
Summary: The trapping and detrapping of nonequilibrium charge carriers have a peculiar influence on the electrochemical and transport properties of bulk and nanoscopic structures. The emergence of memory response with hysteresis and multiple crossing in the current-voltage response is a result of the modulation of current-voltage loops' topology. This method offers insights into intrinsic features affecting electronic transport and simplifies the complexity of frequency-dependent electrochemical impedance and cyclic voltammetry.
JOURNAL OF APPLIED PHYSICS
(2023)
Review
Nanoscience & Nanotechnology
Sergey G. Menabde, Jacob T. Heiden, Joel D. Cox, N. Asger Mortensen, Min Seok Jang
Summary: Polaritonic modes in low-dimensional materials enable strong light-matter interactions and the manipulation of light on nanometer length scales. The recent interest in image polaritons in van der Waals crystals has gained considerable attention in nanophotonics, where a polaritonic material couples with its mirror image in close proximity to a highly conductive metal. These image modes provide an appealing nanophotonic platform with lower propagation loss and access to the nonlocal regime of light-matter interaction.
Article
Chemistry, Multidisciplinary
Saskia Fiedler, P. Elli Stamatopoulou, Artyom Assadillayev, Christian Wolff, Hiroshi Sugimoto, Minoru Fujii, N. Asger Mortensen, Soren Raza, Christos Tserkezis
Summary: Cathodoluminescence spectroscopy in an electron microscope is a versatile tool for analyzing the optical response of plasmonic and dielectric nanostructures. However, the transition radiation produced by electron impact is often neglected. This study demonstrates that transition radiation can generate distinct resonances that interfere constructively or destructively depending on the electron beam's time-of-flight inside the nanosphere, leading to distorted spectra and potentially erroneous modal assignment.
Article
Chemistry, Multidisciplinary
Xiaolong Zhu, Jacob Engelberg, Sergei Remennik, Binbin Zhou, Jonas Nyvold Pedersen, Peter Uhd Jepsen, Uriel Levy, Anders Kristensen
Summary: This work presents a cost-effective and lithography-free method for printing optical metasurfaces. By utilizing resonant absorption of laser light in an optical cavity formed by a multilayer structure, nearly perfect light absorption is achieved through interferometric control. This approach demonstrates reliability, upscaling, and subwavelength resolution in creating metasurfaces for structural colors, optical holograms, and diffractive optical elements.
Article
Chemistry, Multidisciplinary
Sergii Morozov, Stefano Vezzoli, Alina Myslovska, Alessio Di Giacomo, N. Asger Mortensen, Iwan Moreels, Riccardo Sapienza
Summary: Giant shell CdSe/CdS quantum dots exhibit high brightness and flexibility, with near-unity quantum yield and suppressed blinking. However, their single photon purity is reduced due to efficient multiexcitonic emission. In this study, we observed a significant blueshift in the photoluminescence biexciton spectrum of pure-phase wurtzite quantum dots. By using spectral filtering, we achieved a 2.3 times reduction in biexciton quantum yield while preserving 60% of the exciton single photon emission, leading to an improvement in purity from g2(0)=0.07±0.01 to g2(0)=0.03±0.01. Furthermore, at higher pump fluence, the spectral purification was even more effective, resulting in up to a 6.6 times reduction in g2(0) by suppressing higher order excitons and shell states with larger blueshifts.
Article
Engineering, Biomedical
Murat Serhatlioglu, Emil Alstrup Jensen, Maria Niora, Anne Todsen Hansen, Christian Friberg Nielsen, Michelle Maria Theresia Jansman, Leticia Hosta-Rigau, Morten Hanefeld Dziegiel, Kirstine Berg-Sorensen, Ian David Hickson, Anders Kristensen
Summary: A compact microfluidic flow cytometer with viscoelastic flow focusing and fiber optical interface is demonstrated. The device allows for easy operation and interchangeable capillaries to achieve single-train particle focusing for a wide range of particle sizes. The system is integrated with optical imaging and other optofluidic modalities and achieves a high throughput of 3500 events s(-1).
ADVANCED NANOBIOMED RESEARCH
(2023)
Article
Nanoscience & Nanotechnology
Alvaro Rodriguez Echarri, Fadil Iyikanat, Sergejs Boroviks, N. Asger Mortensen, Joel D. Cox, F. Javier Garcia de Abajo
Summary: The promising applications of photonics rely on the fabrication of high-quality metal thin films with controlled thickness in the range of a few nanometers. These materials exhibit highly nonlinear response to optical fields due to ultrafast electron dynamics. However, the understanding of this phenomenon on such small length scales is limited. In this study, a new mechanism controlling the nonlinear optical response of thin metallic films is revealed, which is dominated by ultrafast electronic heat transport when the film thickness is sufficiently small. By experimentally and theoretically studying electronic transport in these materials, the researchers explained the observed temporal evolution of photoluminescence in two-pulse correlation measurements. They found that ultrafast thermal dynamics plays a crucial role in determining the strength and time-dependent characteristics of the nonlinear photoluminescence signal. Their findings provide new insights into the nonlinear optical response of nanoscale materials and offer possibilities for controlling and utilizing hot carrier distributions in metallic films.
Article
Materials Science, Multidisciplinary
Saskia Fiedler, Sergii Morozov, Leonid Iliushyn, Sergejs Boroviks, Martin Thomaschewski, Jianfang Wang, Timothy J. Booth, Nicolas Stenger, Christian Wolff, N. Asger Mortensen
Summary: Cathodoluminescence spectroscopy combined with second-order auto-correlation measurements of g(2)(tau) allows for extensive study of the synchronization of photon emitters in low-dimensional structures. Co-existing excitons in two-dimensional transition metal dichalcogenide monolayers serve as a great source of identical photon emitters that can be simultaneously excited by an electron. In this study, we demonstrate large photon bunching with g(2)(0) up to 156 +/- 16 in a tungsten disulfide monolayer (WS2), showing a strong dependence on the electron-beam current. By carefully selecting a simple and compact geometry, such as a thin monocrystalline gold nanodisk, we achieve a record-high bunching g(2)(0) of up to 2152 +/- 236, improving the excitation synchronization and electron-emitter interaction. This approach of controlling electron excitation of excitons in a WS2 monolayer enables the synchronization of photon emitters in an ensemble, which is crucial for advancing light information and computing technologies.
Article
Nanoscience & Nanotechnology
Saskia Fiedler, Sergii Morozov, Danylo Komisar, Evgeny A. A. Ekimov, Liudmila F. F. Kulikova, Valery A. A. Davydov, Viatcheslav N. N. Agafonov, Shailesh Kumar, Christian Wolff, Sergey I. I. Bozhevolnyi, N. Asger Mortensen
Summary: Impurity-vacancy centers in diamond provide a class of robust photon sources with versatile quantum properties. The ensembles of color centers have tunable photon-emission statistics and their emission properties can be controlled by different types of excitation. Electron-beam excitation can synchronize the emitters' excitation and control the second-order correlation function g(2)(0), as confirmed by experimental results in this letter. Such a photon source based on an ensemble of few color centers in a diamond crystal offers a highly tunable platform for room temperature informational technologies.
Article
Optics
Christos Tserkezis, Christian Wolff, Fedor A. Shuklin, Francesco Todisco, Mikkel H. Eriksen, P. A. D. Goncalves, N. Asger Mortensen
Summary: We propose an efficient approach for actively controlling the Rabi oscillations in nanophotonic emitter-cavity analogs based on the presence of an element with optical gain. Inspired by recent developments in parity-time (PT)-symmetry photonics, we show that nano-or microcavities where intrinsic losses are partially or fully compensated by an externally controllable amount of gain offer unique capabilities for manipulating the dynamics of extended (collective) excitonic emitter systems. Furthermore, we show that there is a specific gain value that leads to an exceptional point, where both the emitter and cavity occupation oscillate practically in phase, with occupation numbers that can significantly exceed unity.
Article
Materials Science, Multidisciplinary
Gino Wegner, Dan-Nha Huynh, N. Asger Mortensen, Francesco Intravaia, Kurt Busch
Summary: The paper discusses the impact of an extended model proposed by Halevi on the nonlocal response of plasmonic materials and nanostructures. It reevaluates the Mie scattering coefficients for a cylinder and corresponding plasmon-polariton resonances within this framework. The analysis reveals a nonlocal, collisional, and size-dependent damping term that affects the resonances in the extinction spectrum. The implementation of the Halevi model in the time domain is particularly important for efficient and accurate modeling of nanogap structures and other nanoscale features in nanoplasmonics applications.
Article
Materials Science, Multidisciplinary
Emil Alstrup Jensen, Murat Serhatlioglu, Cihan Uyanik, Anne Todsen Hansen, Sadasivan Puthusserypady, Morten Hanefeld Dziegiel, Anders Kristensen
Summary: Label-free blood typing using Raman spectroscopy and artificial intelligence was demonstrated in this study. Training an AI model on a dataset of Raman spectra of blood samples allowed classification of ABO blood group, erythrocyte antigens, platelet antigens, antibody titers, and ABH-secretor status. The results show promising potential for future applications in transfusion medicine and blood banking.
ADVANCED MATERIALS TECHNOLOGIES
(2023)
Article
Chemistry, Multidisciplinary
P. Elli Stamatopoulou, Sotiris Droulias, Guillermo P. Acuna, N. Asger Mortensen, Christos Tserkezis
Summary: This paper introduces and analyzes the concept of manipulating optical chirality by strongly coupling the optical modes of chiral nanostructures with excitonic transitions in molecular layers or semiconductors. By demonstrating the generation of two spectral branches that retain the object's high chirality density through strong coupling with a nearby excitonic material, the authors propose that post-fabrication manipulation of optical chirality can be achieved. These findings are further verified through simulations of circular dichroism in a realistic chiral architecture.
Proceedings Paper
Engineering, Multidisciplinary
Murat Serhatlioglu, Emil Alstrup Jensen, Maria Niora, Anne Todsen Hansen, Christian Friberg Nielsen, Michelle Maria Theresia Jansman, Leticia Hosta-Rigau, Morten Hanefeld Dziegiel, Kirstine Berg-Sorensen, Ian D. Hickson, Anders Kristensen
Summary: Flow cytometry (FC) is a pivotal tool for studying the physical and chemical properties of particles. This study presents a miniaturized optical capillary FC device using the viscoelastic focusing technique. The device can collect and analyze light signals in real-time and can be used for both flow cytometry analysis and microscopy imaging. The device has been successfully used for particle measurements and can be combined with other tools for extended applications.
OPTICAL TRAPPING AND OPTICAL MICROMANIPULATION XIX
(2022)
Proceedings Paper
Engineering, Multidisciplinary
Emil Alstrup Jensen, Murat Serhatlioglu, Airidas Zukauskas, Cihan Uyanik, Anne Todsen Hansen, Sadasivan Puthusserypady, Morten Hanefeld Dziegiel, Anders Kristensen
Summary: This study presents a multivariate analysis of human-blood samples for ABO blood typing using Raman spectroscopy and support vector machine (SVM) classification. It addresses the issues of expensive and time-consuming traditional ABO blood typing methods, demonstrating the great potential of the developed system for future blood typing applications.
OPTICAL TRAPPING AND OPTICAL MICROMANIPULATION XIX
(2022)
Article
Optics
F. A. Shuklin, C. Tserkezis, N. Asger Mortensen, C. Wolff
Summary: This study analyzes the emergence of unphysical superluminal group velocities in Su-Schrieffer-Heeger (SSH) parity-time (PT) symmetric chains and explores the origins of this behavior. The analysis reveals that material dispersion is the key factor causing the divergence of group velocities. Restoring causality resolves the issue and sets practical limits on the performance of PT-symmetric systems.
