Article
Chemistry, Physical
Lin Li, Fenglian Qi, Jiong Guo, Jing Fan, Wenxiang Zheng, Murtaza Ghulam, Weizhi Wang, Zihui Meng, Lili Qiu
Summary: In this study, Fe2O3@Au hexagonal nanodisks with tunable near-infrared (NIR) absorptions were successfully prepared. The localized surface plasmon resonance (LSPR) peaks of Au nanodisks were accurately tuned in the NIR therapeutic window. The Fe2O3@Au nanodisks showed low cytotoxicity and high photothermal therapy (PTT) performance.
JOURNAL OF MATERIALS CHEMISTRY A
(2023)
Article
Optics
Zhou Zheng, Zhengying Li, Qingguo Du
Summary: A multi-parameter optical refractometric sensor based on lab-in-a-fiber has been proposed and investigated. It utilizes a specific three suspended-core fiber design for liquid circulation and detection. By coating a bio-recognition layer on the surface of the channels, multiple disease markers can be detected, and their concentration can be measured by the wavelength of fiber Bragg grating in each suspended core. The sensor demonstrates high sensitivity and accuracy.
Article
Optics
Bonan Liu, Kaiming Yang, Changrui Liao, Zhihao Cai, Yifan Liu, Bing Sun, Yiping Wang
Summary: This study reports the fabrication of localized tilted fiber Bragg gratings (TFBGs) with low insertion loss and investigates their spectral performance. TFBGs with different tilt angles were inscribed directly in a single-mode fiber, showing wide cladding-mode resonance range and high refractive index response sensitivity. The impact of inscription offset on the TFBG intensity was also studied.
Article
Engineering, Electrical & Electronic
Ruoqin Yan, Tao Wang, Xiaoyun Jiang, Lu Wang
Summary: The sensor proposed is based on a thin metal film resonance cavity, generating a super-strong electric field via multi-wave interference, making it ideal for high-performance, low-cost biological or chemical sensing with high sensitivity and figure of merit.
IEEE SENSORS JOURNAL
(2021)
Article
Engineering, Electrical & Electronic
Xiaoguang Gao, Lingyu Li, Rong Deng, Wenjuan Zhao, Xiaoliang Zhang, Zhibo Liu
Summary: In this study, a graphene-based optical sensor was developed by uniformly dispersing gold nanorods on the graphene surface. The sensor showed high sensitivity and a simple preparation process, which is of great significance for the quantitative detection of disease markers at ultralow concentrations.
ACS APPLIED ELECTRONIC MATERIALS
(2023)
Article
Optics
Clement Deleau, Han Cheng Seat, Olivier Bernal, Frederic Surre
Summary: This Letter proposes a theoretical analysis and design methodology for integrated long period gratings (LPGs) in refractometric applications. A detailed parametric analysis is applied to a LPG model based on two strip waveguides to investigate the main design variables and their impact on refractometric performances, specifically spectral sensitivity and signature response. Simulations of four variants of the same LPG design using eigenmode expansion demonstrate a wide range of sensitivities up to 300,000 nm/RIU and figures of merit (FOMs) as high as 8000.
Article
Engineering, Electrical & Electronic
Guangyao Wang, Ying Lu, Liangcheng Duan, Jianquan Yao
Summary: The study designed a refractive-index sensor based on photonic crystal fiber (PCF) and surface plasmon resonance (SPR) technology with an ultra-wide detection range. Simulation results showed that the sensor has great potential in the fields of biology, chemistry, environment, and medicine.
IEEE JOURNAL OF SELECTED TOPICS IN QUANTUM ELECTRONICS
(2021)
Article
Multidisciplinary Sciences
Kyeong Rim Ryu, Geun Wan Kim, Ji Won Ha
Summary: This study investigates the sensitivity of detecting chemisorption on single gold nanorods, finding that the inflection point on the long-wavelength side shows higher sensitivity compared to the traditional peak maximum. Monitoring the homogeneous LSPR inflection point at the red side of the scattering spectrum of single AuNRs proves to be useful in tracking the curvature shapes.
SCIENTIFIC REPORTS
(2021)
Article
Physics, Multidisciplinary
Mingrui Su, Yunping Qi, Hao Li, Shu Zhang, Xiangxian Wang
Summary: In order to improve the performance of subwavelength refractive index and temperature sensors, this paper proposes a subwavelength metal-insulator-metal (MIM) waveguide structure consisting of a sawtooth U-shaped cavity and a rectangular cavity based on surface plasmon polaritons. The transmission spectrum of the system is simulated using the finite element method (FEM) and verified with multi-mode interference coupled-mode theory (MICMT). The results demonstrate excellent sensing characteristics for the system, with a refractive index sensitivity of 1300 nm RIU-1, a figure of merit (FOM*) of 191.262, and a temperature sensitivity of 0.525 nm/& DEG;C. This indicates that the nano-plasma system is highly significant in refractive index and temperature sensing.
Article
Nanoscience & Nanotechnology
Wenjing Guo, LiHong Zhai, Zeinhom M. El-Bahy, Zhumao Lu, Lu Li, Ashraf Y. Elnaggar, Mohamed M. Ibrahim, Huiliang Cao, Jing Lin, Bin Wang
Summary: In this research, a terahertz metamaterial biosensor based on the open square ring structure is designed and its absorption performance and sensing performance are analyzed through simulation and testing. The results demonstrate that the sensor exhibits a narrow absorption peak at a resonant frequency of 0.635 THz with an absorption rate of 98.7% and a half-wave width of 8.02 GHz. The sensor shows the best absorbance when the analyte thickness is 30 μm and the opening width is 10 μm. The sensor also exhibits a high-quality factor of 79.26 and a sensitivity of 91.5 GHz/refractive index unit (RIU), making it suitable for label-free high-sensitivity biomedical sensing.
ADVANCED COMPOSITES AND HYBRID MATERIALS
(2023)
Article
Computer Science, Information Systems
M. Hussayeen Khan Anik, M. Ifaz Ahmad Isti, S. M. Riazul Islam, Sakib Mahmud, Hriteshwar Talukder, Md. Jalil Piran, Shovasis Kumar Biswas, Kyung-Sup Kwak
Summary: The proposed SPR-based PCF sensor demonstrates good functionality with high wavelength and amplitude sensitivity, as well as a broad range of analyte detection and high detection accuracy. Numerical investigations show that the sensor is capable of effectively detecting low refractive index analytes.
Article
Optics
Xian Zhang, Yangyang Xu, Xiao-Song Zhu, Yi-Wei Shi
Summary: This paper presents a novel surface plasmon resonance (SPR) temperature sensor based on a silver-coated multi-hole optical fiber (SMHOF). By filling the central and surrounding air holes of the SMHOF with two different thermosensitive liquids, two separated resonance dips are observed, and they move in opposite directions with temperature variation. The interval between the two resonance dips shows good linearity and can be used for temperature detection. The proposed sensor has a high temperature sensitivity and tunable detection range, making it potentially suitable for applications in biomedicine, health care, and environmental monitoring.
Article
Optics
Parisa Borjikhani, Mohammad Ismail Zibaii, Nosrat Granpayeh
Summary: In this study, a tapered optical fiber sensor with gold nanoparticles is simulated and the effect of nanoparticle arrangement on the sensor's sensitivity is investigated. The results show that by varying the arrangement, the sensor's amplitude sensitivity and wavelength sensitivity can be increased, making it practical for applications in biosensing.
JOURNAL OF THE OPTICAL SOCIETY OF AMERICA B-OPTICAL PHYSICS
(2023)
Article
Engineering, Electrical & Electronic
Harbinder Singh, Amit Gupta, Rajinder Singh Kaler, Surinder Singh, Amoljit Singh Gill
Summary: The research explores the sensing properties of an ultrathin metamaterial absorber for refractive index detection in biomedical samples. The absorber, made up of a unique spanner resonator, exhibits high absorption efficiency and excellent sensitivity. It has the potential to detect samples with similar refractive indices, making it a promising candidate for biosensor applications.
IEEE SENSORS JOURNAL
(2022)
Article
Chemistry, Multidisciplinary
Julia Danischewski, Destiny Donelson, Maleeha Farzansyed, Erin Jacoski, Haru Kato, Quincy Lucin, Maryuri Roca
Summary: The intrinsic color change in the preparation of polymeric nanocomposites was studied in this work. A safer and faster method to coat silver nanoparticles with silica was presented and critical factors in the synthesis were identified using a seven-factor Plackett-Burman design. The sensitivity of the localized surface plasmon resonance (LSPR) of silver nanodisks towards changes in refractive index decreased with increasing thickness of the silica shell. A color shift of up to 72 nm was observed when bare nanoparticles were embedded in poly(vinyl alcohol), but no color change was perceived when the nanoparticles were coated with a 25-nm-thick silica shell.
Article
Chemistry, Multidisciplinary
Franz-Philipp Schmidt, Arthur Losquin, Michal Horak, Ulrich Hohenester, Michael Stoger-Pollach, Joachim R. Krenn
Summary: The study utilizes cathodoluminescence (CL) spectroscopy in a transmission electron microscope to investigate the radial breathing mode of plasmonic silver nanodisks. It reveals a spectral shift in the CL spectra acquired from both sides induced by the electron beam, confirmed through numerical simulations. The interference of CL emission patterns of an electron-beam-induced dipole and the breathing mode is identified as a physical effect that can limit fidelity in CL measurements.
Article
Chemistry, Multidisciplinary
Bela Lovasz, Peter Sandor, Gellert-Zsolt Kiss, Balazs Banhegyi, Peter Racz, Zsuzsanna Papa, Judit Budai, Christine Prietl, Joachim R. Krenn, Peter Dombi
Summary: This study explores nonadiabatic nano-optical electron tunneling in the transition region between multiphoton-induced emission and adiabatic tunnel emission in the near-field of plasmonic nanostructures. The measured photoemission spectra exhibit strong-field recollision driven by the nanoscale near-field for Keldysh gamma values between approximately 1.3 and approximately 2.2. At the same time, the photoemission yield shows a constant nonlinearity in intensity scaling, which is characteristic of multiphoton-induced emission.
Article
Instruments & Instrumentation
Katrin Fladischer, Verena Leitgeb, Simon Fernbach, Lisa Mitterhuber
Summary: The thermophysical properties of materials and heat transfer optimization are crucial for the industrial applications of micro- and nanoelectronic devices. The optical-based Time Domain Thermoreflectance (TDTR) method is used to obtain thermal properties of thin layers. The bidirectional heat flow approach extends the range of samples that can be analyzed by TDTR and enables the evaluation of materials with rough surfaces.
TM-TECHNISCHES MESSEN
(2022)
Article
Materials Science, Multidisciplinary
Manuel Auer-Berger, Veronika Tretnak, Christian Sommer, Franz-Peter Wenzl, Joachim R. Krenn, Emil J. W. List-Kratochvil
Summary: The study utilizes plasmonic nanodisk arrays to enhance light emission from an organic white light-emitting diode. By incorporating aluminum as the nanodisk material and employing surface lattice resonances from a multipitch array, the broadband enhancement of light emission in the device is achieved. The experimental results align well with simulations, providing insights into the underlying physical mechanisms.
APPLIED PHYSICS A-MATERIALS SCIENCE & PROCESSING
(2022)
Article
Computer Science, Interdisciplinary Applications
Ulrich Hohenester, Nikita Reichelt, Gerhard Unger
Summary: NANOBEM is a MATLAB toolbox for solving Maxwell's equations and computing resonance modes in nanophotonic systems. It is based on the Galerkin scheme of the boundary element method using Raviart-Thomas shape elements for representing electromagnetic fields. The toolbox focuses on clarity rather than speed and has been developed and tested for small to intermediate-scale problems.
COMPUTER PHYSICS COMMUNICATIONS
(2022)
Article
Physics, Applied
Marko Simic, Doris Auer, Christian Neuper, Nikola Simic, Gerhard Prossliner, Ruth Prassl, Christian Hill, Ulrich Hohenester
Summary: This article proposes and demonstrates a scheme for optical nanoparticle characterization, which achieves real-time optical counting with single-particle sensitivity and high throughput. By monitoring the trajectories and velocity changes of each tracked particle, detailed information about the particle size distribution can be obtained. The experimental results show that this method is suitable for various applications.
PHYSICAL REVIEW APPLIED
(2022)
Article
Multidisciplinary Sciences
Sebastian Scher, Simone Kopeinik, Andreas Truegler, Dominik Kowald
Summary: The use of data-driven decision support by public agencies is becoming more widespread and already influences the allocation of public resources. This paper uses statistics, data-driven approaches, and dynamical modeling to assess the long-term fairness effects of labor market interventions.
SCIENTIFIC REPORTS
(2023)
Article
Nanoscience & Nanotechnology
Raphael Hauer, Georg Haberfehlner, Gerald Kothleitner, Mathieu Kociak, Ulrich Hohenester
Summary: We investigate the tomographic reconstruction of the three-dimensional photonic environment of nanoparticles using electron energy loss spectroscopy (EELS) maps. We compare the reconstructed and simulated photonic local density of states for smooth and rough nanorods, finding very good agreement. We critically examine the potential of our tomography scheme and discuss limitations and future directions.
Article
Engineering, Electrical & Electronic
Martin Belitsch, Dmitry N. Dirin, Maksym V. Kovalenko, Kevin Pichler, Stefan Rotter, Ahmed Ghalgaoui, Harald Ditlbacher, Andreas Hohenau, Joachim R. Krenn
Summary: The study demonstrates the feasibility of using geometrically simple monolithic microscale CdSe/CdS nanoplatelet lasers as a promising option for various photonic applications. The CdSe/CdS nanoplatelets show high gain factor and emission pulse shortening.
MICRO AND NANO ENGINEERING
(2022)
Article
Physics, Applied
Marko Simic, Christian Hill, Ulrich Hohenester
Summary: Optofluidic force induction (OF2i) is an optical nanoparticle characterization scheme that enables real-time optical counting with single-particle sensitivity and high throughput. In a recent paper, we demonstrated the working principle of OF2i for standardized polystyrene nanoparticles and developed a theoretical model to analyze experimental data. This paper provides a detailed account of the model ingredients, including the full working equations, additional justification for the assumptions underlying OF2i, and discusses future directions for further developments and research.
PHYSICAL REVIEW APPLIED
(2023)
Article
Biochemical Research Methods
Marko Simic, Christian Neuper, Ulrich Hohenester, Christian Hill
Summary: Manufacturers of nanoparticle-based products rely on detailed information about critical process parameters, but traditional offline characterization techniques lack temporal resolution. To address this, the recently introduced Optofluidic Force Induction (of2i) provides real-time counting with single particle sensitivity and high throughput. This study applies of2i to highly polydisperse and multi-modal particle systems, monitoring evolutionary processes over large time scales and introducing a novel process feedback parameter. Our results demonstrate the versatility of of2i in various applications.
ANALYTICAL AND BIOANALYTICAL CHEMISTRY
(2023)
Proceedings Paper
Computer Science, Theory & Methods
Brennan Bell, Andreas Truegler
Summary: This study presents experimental evidence of a side-channel attack on superconducting cloud-based quantum computers, showing that information about a quantum circuit can be acquired indirectly using data before and after its execution. The findings of this study are important for further research on hardware and system stability of quantum computers as well as for understanding more nuanced systems-level attacks.
2022 IEEE INTERNATIONAL CONFERENCE ON QUANTUM COMPUTING AND ENGINEERING (QCE 2022)
(2022)
Proceedings Paper
Nanoscience & Nanotechnology
Bela Lovasz, Peter Sandor, Gellert-Zsolt Kiss, Balazs Banhegyi, Peter Racz, Zsuzsanna Papa, Judit Budai, Christine Prietl, Joachim R. Krenn, Peter Dombi
Summary: Our work demonstrates nonadiabatic tunneling of photoelectrons in the near-field of gold nanostructures, and investigates its characteristics in the transition region between the multi-photon-induced photoemission and tunneling emission regimes.
Article
Chemistry, Multidisciplinary
Dario Grimaldi, Emil Kelderer, Dmitry N. Dirin, Maksym Kovalenko, Andreas Hohenau, Harald Ditlbacher, Joachim R. Krenn
Summary: This study demonstrates that the photoconductance of colloidal PbS/MAPbI(3) quantum dots in nanoscale gold electrode gaps exhibits a power law dependence on the light intensity. The research reveals the strong localization and high reproducibility of photocurrent generation, and shows that different geometries and excitation methods yield practically identical photocurrent responses.
NANOSCALE ADVANCES
(2022)
Article
Materials Science, Multidisciplinary
Ulrich Hohenester, Gerhard Unger
Summary: In this paper, the authors introduced a theoretical framework for nanoscale electromagnetism based on Feibelman parameters and demonstrated how to implement mesoscopic boundary conditions in a boundary element method approach. The simulation results showed perfect agreement with Mie theory.
