Article
Chemistry, Analytical
E. E. Gallego Martinez, I. R. Matias, S. Melendi-Espina, M. Hernaez, C. Ruiz Zamarreno
Summary: The sensitivity of gas sensing devices based on Lossy Mode Resonances (LMR) is significantly enhanced by using nanometric Graphene Oxide / Polyethyleneimine (GO/PEI) bilayers deposited onto SnO2 coated CaF2 planar waveguides. The LMR generation in the mid-infrared region, achieved with the help of fluorinated (CaF2) planar waveguides, contributes to the improved sensitivities. The number of GO/PEI bilayers affects the LMR wavelength shift, with 10 bilayers showing a 5-fold increase in sensitivity to 1-butanol compared to devices without GO/PEI bilayers. The GO/PEI sensor also exhibits sensitivity to other alcohols but negligible sensitivity to other gases, such as CO2, NH3, or C2H2. Cross sensitivity with temperature fluctuations does not affect the sensor performance during water vapor measurement.
SENSORS AND ACTUATORS B-CHEMICAL
(2023)
Article
Optics
Zijin Wang, Jiarui He, Jiaxiang Chen, Jiangtao Zhu, Chengyou Lin
Summary: This paper presents a copper-based fiber SPR sensor using two-dimensional transition metal dichalcogenides (TMDs) and investigates the relationship between sensitivity and the number of TMDs layers. The results show that the sensor achieves the highest sensitivity in the mid-infrared regime, making it suitable for highly sensitive biosensing applications.
Article
Chemistry, Analytical
Yuefeng Wang, Weiwei Chen, Pengjun Wang, Shixun Dai, Jun Li, Yan Li, Qiang Fu, Tingge Dai, Hui Yu, Jianyi Yang
Summary: A suspended slot chalcogenide glass waveguide gas sensor is proposed, designed, and analyzed in detail, achieving high power confinement factor within a specific wavelength range and demonstrating strong detection performance for methane gas. The optimization of structural parameters leads to improved sensitivity and limit of detection for the proposed waveguide sensor.
SENSORS AND ACTUATORS B-CHEMICAL
(2021)
Article
Optics
Firoz Haider, Rifat Ahmmed Aoni, Rajib Ahmed, Wei Jen Chew, Ghafour Amouzad Mahdiraji
Summary: In this study, a plasmonic sensor based on a metal coated micro-channel is proposed, which shows significantly enhanced performance due to the introduction of a micro-channel and the use of gold and titanium dioxide materials to increase sensitivity and resolution.
OPTICS AND LASER TECHNOLOGY
(2021)
Article
Engineering, Electrical & Electronic
Md. Aslam Mollah, Md. Saiful Islam
Summary: A novel single air hole exposed core PCF sensor based on localized surface plasmon resonance (LSPR) for bio-analyte sensing is proposed in this study. The sensor utilizes a gold (Au) nano strip and a thin layer of titanium oxide (TiO2) for improved sensing performance and low loss. Numerical results demonstrate that the sensor shows high amplitude sensitivity, wavelength sensitivity, and resolution in a wide range of refractive index variations.
IEEE SENSORS JOURNAL
(2021)
Article
Chemistry, Analytical
Tan Tai Nguyen, Nguyen Van Sau, Quang Minh Ngo, Gauthier Eppe, Ngoc Quyen Tran, Nguyen Thi Phuong Anh
Summary: The multilayer of the surface plasmon resonance (SPR) sensor was optimized to achieve the maximum sensor sensitivity. The optimized sensor showed high detection accuracy and sensitivity, indicating potential applications in the field of biological diagnosis.
Article
Chemistry, Multidisciplinary
Qiao Wang, Kaili Kuang, Huixuan Gao, Shuwen Chu, Li Yu, Wei Peng
Summary: This paper investigates the EIT-like effect achieved through the coupling of two waveguide resonances in a compound nanosystem. It demonstrates that destructive interference between two dark modes can lead to the realization of EIT-like effect. The findings suggest potential for further studies on EIT-like effect with dark-dark mode coupling in other systems.
Article
Materials Science, Multidisciplinary
Yan Jia, Dongqing Liu, Xinfei Wang, Baizhang Cheng, Haifeng Cheng
Summary: In this study, aluminum-doped zinc oxide (AZO) nanocrystals with different doping contents (1-20at%) were synthesized, and the localized surface plasmon resonance (LSPR) absorption peaks in the mid-infrared region (2.5-25 & mu;m) were regulated accordingly. The AZO film with 1at% nominal Al doping and a thickness of 1316 nm achieved the highest electrochemical infrared absorption regulation, with 35.9% regulation at 3-5 & mu;m and 32.5% at 7.5-13 & mu;m. The research proposed the infrared absorption regulation mechanism of AZO nanocrystals and demonstrated their potential applications in infrared displays and camouflage.
MATERIALS RESEARCH EXPRESS
(2023)
Article
Engineering, Electrical & Electronic
Xi Zhang, Min Chang, Nan Chen, Xuejing Liu, Jin Zhang, Jia Du, Xin Ding
Summary: A mid-infrared TE(01) vector mode selector based on chalcogenide ring-core few-mode fiber is proposed and investigated numerically. By embedding metal composite nanowire to generate surface plasmon resonance, low loss transmission of TE01 vector mode is achieved.
OPTICAL FIBER TECHNOLOGY
(2022)
Article
Engineering, Manufacturing
Tun Cao, Meng Lian, Kuan Liu, Xianchao Lou, Yaoming Guo, Dongming Guo
Summary: Researchers have developed a broadband mid-infrared thermal emitter using stacked nanocavity metasurfaces, which can absorb a wide range of polarized light and achieve high thermal radiation in the 8-14 μm atmospheric window.
INTERNATIONAL JOURNAL OF EXTREME MANUFACTURING
(2022)
Article
Engineering, Electrical & Electronic
Yusuf Gamal, B. M. Younis, Ahmed El-Sayed Abd-Elkader, David Furniss, Mark Farries, Sendy Phang, Trevor M. Benson, Angela B. Seddon, Mohamed Farhat O. Hameed, S. S. A. Obayya
Summary: In this paper, a highly sensitive water pollutant optical sensor is proposed and analyzed. The sensor can efficiently detect dissolved pollutants in water and has a higher RI sensitivity compared to other reported sensors, especially those operating in the mid infrared wavelengths.
OPTICAL AND QUANTUM ELECTRONICS
(2023)
Article
Physics, Applied
Michael Barrow, Jamie Phillips
Summary: The high-Q resonances observed in subwavelength gratings have various applications and can be integrated with active devices, opening new possibilities for microscale optical systems.
APPLIED PHYSICS LETTERS
(2021)
Article
Chemistry, Multidisciplinary
Weikang Yao, Qilin Zhou, Chonglu Jing, Ai Zhou
Summary: We propose an optical device based on fiber-integrated metasurfaces in the mid-infrared, utilizing a hollow core anti-resonant fiber (HC-ARF) to confine light transmission and achieving transmissive modulation of the optical field through bilayer metasurfaces. The Fano resonance excited by the metasurface enables refractive index sensing with high sensitivity and figure of merit (FOM), and a polydimethylsiloxane (PDMS) layer between the metasurfaces allows for tunable functionality by temperature control. This integrated fiber multifunctional device is expected to have applications in high-power mid-infrared lasers, mid-infrared laser biomedicine, and gas trace detection.
Article
Physics, Multidisciplinary
Muhammad Asif Ahmad Khushaini, Nur Hidayah Azeman, Tg Hasnan Tg Abdul Aziz, Ahmad Ashrif A. Bakar, Richard M. de la Rue, Ahmad Rifqi Md Zain, Burhanuddin Yeop Majlis, Clarence Augustine Th Tee
Summary: A strong coupling regime with dressed states is observed when a propagating surface plasmon mode continuously exchanges energy with a group of excitons at a rate faster than the system's losses. This phenomenon, characterized by the superposition of superradiance excitons and PSP modes along with remaining subradiance excitons, is found to exist in a hybrid system of nonlinear organic dye layer and PSP mode. The experimental and theoretical results demonstrate a close agreement, providing a new perspective on the relationship between the optical properties of a third-order nonlinear material and the extent of strong coupling.
Article
Optics
Soocheol Kim, Jin Hwa Ryu, Hoesung Yang, Kyuwon Han, Hyunseok Kim, Kwangsoo Cho, Soyoung Park, Sang Gi Hong, Kangbok Lee
Summary: This paper presents a spectrometer-based surface plasmon resonance imaging (SPRi) technique without mechanical scanning. A polarized broadband light source illuminates an object via a gold-coated prism, and the reflected light is spatially modulated by a digital mirror device (DMD) and measured with a spectrometer. Reflectance spectral images are reconstructed using the Hadamard transform (HT), and a refractive index (RI) map is visualized by analyzing the resonance peak shift at each image pixel. The method is demonstrated to have high resolution, sensitivity, and dynamic detection range, with experimental results validating the simulations.
Article
Engineering, Electrical & Electronic
D. Salvoni, L. Parlato, M. Ejrnaes, F. Mattioli, A. Gaggero, F. Martini, A. Boselli, A. Sannino, S. Amoruso, R. Cristiano, G. P. Pepe
Summary: In this work, the fabrication and characterization results of a large area Superconducting Nanowire Single Photon Detector (SNSPD) are presented. A particular geometry was adopted to enhance its coupling with the Lidar system MALIA, which is used for atmospheric aerosols observations from ultraviolet to infrared. The devices realized in this study are very promising due to their very low dead time despite the large sensitive area.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Engineering, Electrical & Electronic
F. Chiarello, D. Alesini, D. Babusci, C. Barone, M. M. Beretta, B. Buonomo, A. DaElia, D. Di Gioacchino, G. Felici, G. Filatrella, L. G. Foggetta, A. Gallo, C. Gatti, C. Ligi, G. Maccarrone, F. Mattioli, S. Pagano, L. Piersanti, A. Rettaroli, S. Tocci, G. Torrioli
Summary: There is a growing interest in the detection of single microwave photons due to the search for light dark matter and the development of quantum technologies. This study presents an experimental investigation of a resonantly activated Josephson junction for detecting microwave photons. The results provide insights for optimizing the design of a single microwave-photon detector.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2022)
Article
Physics, Applied
D. Salvoni, M. Ejrnaes, A. Gaggero, F. Mattioli, F. Martini, H. G. Ahmad, L. Di Palma, R. Satariano, X. Y. Yang, L. You, F. Tafuri, G. P. Pepe, D. Massarotti, D. Montemurro, L. Parlato
Summary: Superconducting nanowire single-photon detectors (SNSPDs) have attracted interest for their high performance in the infrared, but the mechanism behind their detection is unclear. This study investigates the role of vortices in 2D molybdenum silicide SNSPDs and compares devices made from different materials.
PHYSICAL REVIEW APPLIED
(2022)
Article
Nanoscience & Nanotechnology
Agostino Occhicone, Raffaella Polito, Francesco Michelotti, Michele Ortolani, Leonetta Baldassarre, Marialilia Pea, Alberto Sinibaldi, Andrea Notargiacomo, Sara Cibella, Francesco Mattioli, Pascale Roy, Jean-Blaise Brubach, Paolo Calvani, Alessandro Nucara
Summary: The growing need for new surface sensing methods has led to interest in the electromagnetic excitations of ultrathin films. Bloch surface waves (BSW) have been found to be a valid alternative to surface plasmon polaritons for high-sensitivity sensors in the visible spectral range. In this work, we demonstrate the first infrared BSWs at cryogenic temperatures using a one-dimensional photonic crystal. Additionally, we show that the proposed BSW-based sensor has a high sensitivity for detecting nanometer-thick ice layers. Bloch surface wave-based sensors are a new class of surface mode-based sensors with potential applications in materials science.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Physics, Applied
L. Parlato, D. Salvoni, M. Ejrnaes, F. Mattioli, A. Gaggero, F. Martini, D. Massarotti, D. Montemurro, R. Satariano, R. Ferraiuolo, F. Chianese, F. Tafuri, R. Cristiano, G. P. Pepe
Summary: This study aims to test the feasibility of using superconducting microstrips as single photon detectors and compares them with superconducting nanostrips. The results demonstrate that superconducting microstrips can function as photon detectors at 4.2K and have lower noise compared to nanowires.
JOURNAL OF LOW TEMPERATURE PHYSICS
(2022)
Article
Chemistry, Multidisciplinary
Mario Malerba, Simone Sotgiu, Andrea Schirato, Leonetta Baldassarre, Raymond Gillibert, Valeria Giliberti, Mathieu Jeannin, Jean-Michel Manceau, Lianhe Li, Alexander Giles Davies, Edmund H. Linfield, Alessandro Alabastri, Michele Ortolani, Raffaele Colombelli
Summary: The concept of strong light-matter coupling has been demonstrated in semiconductor structures, allowing for the study of light-matter interaction in subwavelength-sized nanocavities. A novel nano spectroscopy technique using an inserted polymer layer and atomic force microscopy enables the observation of cavity losses and the characterization of near-field coupling.
Article
Engineering, Electrical & Electronic
Alessandro D'Elia, Alessio Rettaroli, Simone Tocci, Danilo Babusci, Carlo Barone, Matteo Beretta, Bruno Buonomo, Fabio Chiarello, Nassim Chikhi, Daniele Di Gioacchino, Giulietto Felici, Giovanni Filatrella, Mikhail Fistul, Luca Foggetta, Claudio Gatti, Evgeni Il'ichev, Carlo Ligi, Mikhail Lisitskiy, Giovanni Maccarrone, Francesco Mattioli, Gregor Oelsner, Sergio Pagano, Luca Piersanti, Berardo Ruggiero, Guido Torrioli, Alexandre Zagoskin
Summary: Axions detection requires ultimate sensitivity and extremely low dark-count rate. This article introduces two approaches based on superconducting devices using the Josephson effect, one using a single Josephson junction as a switching detector, and the other using two resonators coupled via a superconducting qubit network.
IEEE TRANSACTIONS ON APPLIED SUPERCONDUCTIVITY
(2023)
Article
Biotechnology & Applied Microbiology
Maria Eleonora Temperini, Flavio Di Giacinto, Sabrina Romano, Riccardo Di Santo, Alberto Augello, Raffaella Polito, Leonetta Baldassarre, Valeria Giliberti, Massimiliano Papi, Umberto Basile, Benedetta Niccolini, Ewa K. Krasnowska, Annalucia Serafino, Marco De Spirito, Alessandra Di Gaspare, Michele Ortolani, Gabriele Ciasca
Summary: This study demonstrates the use of mid-infrared plasmonic nanoantenna arrays to detect the specific vibrational absorption signal of EVs and the unspecific refractive index sensing signal. By immobilizing EVs on the gold nanoantenna surface through immunocapture, the researchers were able to selectively detect specific EV sub-populations and eliminate contaminants. The findings suggest that this lab-on-chip system has the potential to impact the development of novel laboratory medicine methods for the molecular characterization of EVs, due to its high protein sensitivity and ability to work with small sample volumes.
JOURNAL OF NANOBIOTECHNOLOGY
(2022)
Article
Physics, Applied
Enrico Talamas Simola, Michele Montanari, Cedric Corley-Wiciak, Luciana Di Gaspare, Luca Persichetti, Marvin H. Zoellner, Markus A. Schubert, Tommaso Venanzi, Marina Cagnon Trouche, Michele Ortolani, Francesco Mattioli, Gianfranco Sfuncia, Giuseppe Nicotra, Giovanni Capellini, Michele Virgilio, Monica De Seta
Summary: This article investigates the technique for controlling heteroepitaxial growth at the subnanometer scale. Through structural investigation, THz spectroscopy absorption experiments, and numerical simulations, it is shown that the optimized deposition process can produce high-quality heterostructures with precise control of dopant atom position, layer thickness, and composition. This technique is crucial for the deposition of integrated THz devices and other complex quantum structures based on the Ge/SiGe material system.
PHYSICAL REVIEW APPLIED
(2023)
Article
Chemistry, Multidisciplinary
Alessandra Di Gaspare, Valentino Pistore, Elisa Riccardi, Eva A. A. Pogna, Harvey E. Beere, David A. Ritchie, Lianhe Li, Alexander Giles Davies, Edmund H. Linfield, Andrea C. Ferrari, Miriam S. Vitiello
Summary: This study demonstrates mode-locking in surface-emitting electrically pumped random quantum cascade lasers at terahertz frequencies by exploiting the giant third-order nonlinearity of semiconductor heterostructure lasers and the nonlinear properties of graphene. Self-induced phase-coherence between naturally incoherent random modes and phase-locked random modes are achieved using lithographically patterning a multilayer graphene film or coupling a saturable absorber graphene reflector. This milestone in the physics of disordered systems paves the way for miniaturized, electrically pumped mode-locked light sources for various applications.
Article
Instruments & Instrumentation
Maria Eleonora Temperini, Raffaella Polito, Antonia Intze, Raymond Gillibert, Fritz Berkmann, Leonetta Baldassarre, Valeria Giliberti, Michele Ortolani
Summary: We have developed a confocal laser microscope operating in the mid-infrared range for the study of light-sensitive proteins, such as rhodopsins. The microscope features a co-aligned infrared and visible illumination path for the selective excitation and probing of proteins located in the IR focus only. An external-cavity tunable quantum cascade laser provides a wavelength tuning range suitable for studying protein conformational changes as a function of time delay after visible light excitation with a pulsed LED.
REVIEW OF SCIENTIFIC INSTRUMENTS
(2023)
Article
Environmental Sciences
Andrea Massi, Michele Ortolani, Domenico Vitulano, Vittoria Bruni, Paolo Mazzanti
Summary: In this study, new methods are presented for the interpretation and treatment of thermal images of the Poggio Baldi landslide in Italy. Thermal images were obtained using a high-performance camera, and the digital pixel intensities were treated as wavelength-integrated infrared spectral reflectance, considering reflection to be dominant over thermal emission. A multiscale image segmentation algorithm was used to identify lower signal portions of the landslide, which were overlaid on the visible image to provide an interpretation of the different thermal imaging contrast mechanisms that could be used for landslide monitoring in the future.
Article
Materials Science, Multidisciplinary
Simone Sotgiu, Tommaso Venanzi, Francesco Macheda, Elena Stellino, Michele Ortolani, Paolo Postorino, Leonetta Baldassarre
Summary: In this study, we investigated the Raman modes in MoSe2 using resonance Raman scattering and found that the intensity of high-order modes is enhanced at an excitation energy of 1.16 eV. By comparing experimental results with theoretical calculations, we identified that the high-order modes mostly originate from two-phonon modes with opposite momenta. We also observed that lowering the crystal temperature actively suppresses the intensity of resonant two-phonon modes.
Article
Materials Science, Multidisciplinary
Federico De Luca, Michele Ortolani, Cristian Ciraci
Summary: Heavily doped semiconductors are promising low-loss and tunable materials for plasmonics in the mid-infrared range. This study analyzes the nonlinear optical response of free electrons and examines how the intrinsic properties of semiconductors, such as background permittivity and effective mass, influence the nonlinear optical phenomena associated with high electron concentration. By applying a recently developed hydrodynamic description, which incorporates nonlinear contributions up to the third order, usually negligible for noble metals, the third-harmonic generation from InP, Ge, GaAs, Si, ITO, and InSb is compared. The results demonstrate the potential enhancement of free electron nonlinearities through appropriate semiconductor selection.
EPJ APPLIED METAMATERIALS
(2022)
