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Gradiometer-based Assessment of Magnetic Nanoparticles Quantification
Giuseppe Barbieri;Johan Arbustini;Luis Ignacio Araos Acharán;Andreas Bahr;Martina Gerken
2024 International Conference on Electromagnetics in Advanced Applications (ICEAA)
Year: 2024 | Conference Paper |
Magnetic nanoparticles (MNPs) are gaining importance in the biomedical field because of their versatility for various applications, ranging from diagnostic contrast imaging to tumor ablation through hyperthermia [1]. Their nanoscale dimensions enable superparamagnetic effects, which are crucial for efficient manipulation under external magnetic fields. However, achieving functional and sensitive m...Show More
Nanooptical Substrates for Resonance-Enhanced Gold Growth
2024 24th International Conference on Transparent Optical Networks (ICTON)
Year: 2024 | Conference Paper |
Metal lines grown by photocatalysis from solution and dissolved by chemical dissolution are a promising technical approach to mimic the growth and pruning of long-range axonal connections in neuromorphic computing architectures. We investigate a metal line growth approach on the surface of a photoactive titanium dioxide layer. In order to achieve a light-stimulus dependent metal growth nanooptical...Show More
We investigate a coupled multiscale 3-D finite-element model consisting of an orthogonal array of thin-film cantilever magnetoelectric (ME) magnetic field sensors and a simplified human head model. Electric point dipole sources are placed inside the head to generate an electromagnetic field. This field propagates through the tissue layers and outside of the head, where it reaches the sensor array....Show More
Simulation of Photocatalytic Gold Growth on Resonant Optical Templates
2023 International Conference on Electromagnetics in Advanced Applications (ICEAA)
Year: 2023 | Conference Paper |
In neuronal networks, the capability of dynamic stimulus-controlled formation and dissolution of network connections is an important factor for efficiency. In biological neural networks, fast-reacting local synaptic network connections are combined with the slower and long-range growth of global axon connections. Connections are formed in an interplay of self-organized, parallel connections and ge...Show More
Integrated ArUco Fiducial Markers in Resonant Waveguide Gratings for Pose Estimation
2023 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
Year: 2023 | Conference Paper |
Fiducial markers have been used extensively in computer vision for pose estimation and control of robotic movement [1]. Implementing fiducial markers into surface metamaterials enables a pathway for low intrusive added functionality in real-world applications for robotic and computer vision based systems, as was recently shown by Agha et al. for photonic crystal structures [2]. The optical propert...Show More
Nanostructured Organic Optoelectronics Revisited
2023 Photonics North (PN)
Year: 2023 | Conference Paper |
The implementation of nanostructures in optoelectronic devices has been studied extensively with the aim of light management and device efficiency enhancement. Here we discuss recent advances. We focus on the effect of nanopatterns integrated with solar cells and photodetectors based on organic semiconductor materials (OPV). We present finite-element method (FEM) simulations to calculate the wavel...Show More
Pattern Design of Diffractive Optical Sensor Elements for Multiplex Interferometry
In interferometric optical sensors, phase information is extracted from the modulated light intensity. In the case of free-standing interferometers, operating through the far-field interferogram, multiplex phase detection is not trivial. Multipinhole or multimicrodisk interferometry are examples of common-path interferometers that allow multiplex interferometric phase detection. Thereby an unambig...Show More
Exfoliated Flexible Photonic Crystal Slabs for Refractive Index and Biomolecular Sensing
Fabio A. Kraft;Jan Schardt;Deborah Kitzler;Andreas Latz;Martina Gerken
Using the optical transduction properties of 1-D photonic crystal slabs (PCSs) is a promising approach for label-free biosensing in the field of flexible and wearable biosensing. In this work, we demonstrate the fabrication of flexible PCSs (f-PCSs) via an exfoliation method from rigid PCSs. We investigate the processing effect on the optical properties and show that the optical resonances are mai...Show More
A joint magnetoelectric sensor and human head model for biomagnetic simulation
2022 International Conference on Electromagnetics in Advanced Applications (ICEAA)
Year: 2022 | Conference Paper |
In recent years, thin-film magnetoelectric (ME) magnetic-field sensors have emerged as novel and advantageous devices for biomagnetic measurements. These ME sensors promise contactless readings of the magnetic fields generated by the human body, e.g., in magnetocardiography, with added benefits such as operation at room temperature without magnetic shielding [1]. The ME sensors considered here are...Show More
Flexible Photonic Crystal Slabs for Microfluidic Integration
2022 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)
Year: 2022 | Conference Paper |
Cited by: Papers (1)
Photonic crystal slabs (PCS) on glass substrates have been studied and used extensively as a label-free platform for biomarker detection. Therefore, photonic crystal slabs are a promising approach for biomarker detection with wearable flexible sensor systems. In this work we demonstrate a novel approach for creating flexible photonic crystal slabs (f-PCS) on the basis of nanostructure transfer wit...Show More
Trade-off between spatial resolution and sensitivity of magnetoelectric magnetic field sensors
2021 International Conference on Electromagnetics in Advanced Applications (ICEAA)
Year: 2021 | Conference Paper |
Magnetoelectric (ME) magnetic field sensors are an aspiring sensor type for the accurate measurement of biomagnetic fields in applications such as magnetocardiography or placing of deep-brain stimulation electrodes. Their design allows measurement of magnetic fields in the low pT-range while offering unique benefits such as unshielded operation and no requirement of additional heating or cooling [...Show More
Refractive Index Measurement with a Flexible OLED-OPD Detection Unit
2020 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)
Year: 2020 | Conference Paper |
The refractive index (RI) of liquids plays an important role in chemical analysis and medical diagnostics. Here, we present the integration of a flexible substrate with 6 blue organic light emitting diodes (OLEDs) and 6 organic photodetectors (OPDs) with a flexible microfluidic system formed in polydimethylsiloxane (PDMS). The devices are fabricated by masked thermal evaporation on a $200 \mu \mat...Show More
Ultrasensitive Magnetoelectric Sensing System for Pico-Tesla MagnetoMyoGraphy
Siming Zuo;Julius Schmalz;Mesut-Ömür Özden;Martina Gerken;Jingxiang Su;Florian Niekiel;Fabian Lofink;Kianoush Nazarpour;Hadi Heidari
Magnetomyography (MMG) with superconducting quantum interference devices (SQUIDs) enabled the measurement of very weak magnetic fields (femto to pico Tesla) generated from the human skeletal muscles during contraction. However, SQUIDs are bulky, costly, and require working in a temperature-controlled environment, limiting wide-spread clinical use. We introduce a low-profile magnetoelectric (ME) se...Show More
OLED-OPD Matrix for Sensing on a Single Flexible Substrate
Igor Titov;Markus Köpke;Nicole Christine Schneidewind;Janek Buhl;Yolande Murat;Martina Gerken
Integration of organic light emitting diodes (OLEDs) and organic photodetectors (OPDs) on flexible plastic substrates promises compact and low-cost optical detection units for multiplex sensors. These units may be laminated to a microfluidic system for sensing applications in a liquid. Here, a 6 × 6 element matrix of alternating blue OLEDs and OPDs is demonstrated on a single flexible plastic subs...Show More
Love Wave Magnetic Field Sensor Modeling — from 1D to 3D Model
Julius Schmalz;Benjamin Spetzler;Franz Faupel;Martina Gerken
2019 International Conference on Electromagnetics in Advanced Applications (ICEAA)
Year: 2019 | Conference Paper |
Cited by: Papers (2)
Three different finite element method (FEM) models of a surface acoustic wave (SAW) based magnetic field sensor with increasing complexity from one dimensional to three dimensional model are presented and compared. These sensors are designed to measure weak biomagnetic fields in an unshielded environment at room temperature, using a magnetostrictive layer at the surface to convert a magnetic signa...Show More
Towards Solution-Processed Top-Emitting OLEDs Using a Phosphorescent Iridium Complex
2019 21st International Conference on Transparent Optical Networks (ICTON)
Year: 2019 | Conference Paper |
Phosphorescent inverted top-emitting OLEDs using green iridium complexes have been fabricated by spin coating and their performances compared to bottom-emitting OLEDs based on the same materials. Even if the current efficiency is lower, respectively 7.0 ± 1.1 cd.A-1 and 12.9 ± 1.9 cd.A-1, this paper demonstrates the feasibility to fabricate phosphorescent top-emitting OLEDs by using a solution pro...Show More
OLED-OPD Matrix for Fluorescence Sensing on a Single Flexible Substrate
Nicole Schneidewind;Markus Köpke;Janek Buhl;Yolande Murat;Martina Gerken
2019 IEEE International Conference on Flexible and Printable Sensors and Systems (FLEPS)
Year: 2019 | Conference Paper |
Cited by: Papers (2)
Integration of organic light emitting diodes (OLEDs) and organic photodetectors (OPDs) on flexible plastic substrates promises wearable on-skin continuous health monitoring sensors based on optical measurements. Here, a 6 × 6 element matrix of alternating blue organic light emitting diodes (OLEDs) and organic photodetectors (OPDs) is demonstrated on a single flexible plastic substrate. The individ...Show More
Recent progress in photonics-based biomedical and environmental sensing
2018 International Conference Laser Optics (ICLO)
Year: 2018 | Conference Paper |
Recent progress in photonics-based biomedical sensing will be reviewed. Similar techniques relevant to environmental sensing will also be considered. Planar device technologies such as photonic crystal structures, metasurfaces and photonic wire waveguide structures will be described and compared. The possible roles of lasers, in particular semiconductor lasers, will be examined.Show More
An Optically Programmable Surface Realized With Azobenzene-Functionalized Lotus Leaf and OLEDs
Matthias Bremer;Christine Kallweit;André F. K. Iwers;Martina Gerken
IEEE Photonics Technology Letters
Cited by: Papers (3)
Spatially programmable surface properties are important building blocks for future microfluidic and biosensor devices. We demonstrate switching of a photochromic surface with a blue organic light-emitting diode (OLED) suitable as an integrated on-chip light source. The surface of a positive polydimethylsiloxane replica of a fresh lotus leaf is covalently functionalized with a photoswitchable azobe...Show More
Sensitivity enhancement of an intensity-based photonic crystal biosensor using a laser excitation source
2017 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)
Year: 2017 | Conference Paper |
Photonic Crystal Slabs (PCSs) are nanostructured, dielectric waveguides that feature resonances with small bandwidths and very high reflectivity in the visible spectrum. As refractive index-sensitive transducers, PCSs have been studied for biosensing applications in the past decades [1]. Incident light can couple to and from quasi-guided modes at resonance wavelengths. Due to the evanescent field ...Show More
Sensitivity enhancement of an intensity-based photonic crystal biosensor using a laser excitation source
Year: 2017 | Conference Paper |
Simulation of nanostructured emission layers for tailoring the angular radiation pattern of OLEDs
2017 International Conference on Electromagnetics in Advanced Applications (ICEAA)
Year: 2017 | Conference Paper |
Periodic nanostructures in OLEDs offer the possibility to tailor the radiation pattern by resonant light outcoupling. Such structures are simulated with the FDTD method. We show that absorbing dielectric layers decrease the peak outcoupling intensity while metallic layers can increase the peak intensity because the resonant guided mode is pushed away from the metal and therefore experiences lower ...Show More
Simulation of photonic waveguides with deterministic aperiodic nanostructures for biosensing
2016 International Conference on Electromagnetics in Advanced Applications (ICEAA)
Year: 2016 | Conference Paper |
Cited by: Papers (1)
Photonic waveguides with deterministic aperiodic corrugations offer rich spectral characteristics under surface-normal illumination. The finite-element method (FEM), the finite-difference time-domain (FDTD) method and a rigorous coupled wave algorithm (RCWA) are compared for computing the near-field and far-field properties of structures based on a Rudin-Shapiro binary sequence. All simulation met...Show More
Imaging label-free biosensor for multiplexed protein detection
2016 18th International Conference on Transparent Optical Networks (ICTON)
Year: 2016 | Conference Paper |
Cited by: Papers (1)
The specific, time-resolved, and parallel detection of different proteins with a handheld system is demonstrated. Locally-functionalized photonic crystal surfaces are employed as the transducer for an intensity-based, spectrometer-free measurement. The biosensor is fabricated by first forming the grating structure with ultraviolet nanoimprint lithography, depositing an 80-nm thick titanium dioxide...Show More
Signal-to-Noise Ratio in Cantilever Magnetoelectric Sensors
Jascha Lukas Gugat;Matthias C. Krantz;Julius Schmalz;Martina Gerken
IEEE Transactions on Magnetics
Cited by: Papers (8)
The signal-to-noise ratio (SNR) is investigated for compound magnetoelectric (ME) sensors on cantilever substrates (SUBs) for the detection of low-level magnetic fields. Operated at the mechanical resonance, the magnetic field deforming the magnetostrictive (MS) layer causes a resonant bending-mode response in the ME cantilever. The deformation of the piezoelectric (PE) layer allows for the extrac...Show More
Magnetic Flux Concentration Effects in Cantilever Magnetoelectric Sensors
Jascha Lukas Gugat;Julius Schmalz;Matthias C. Krantz;Martina Gerken
IEEE Transactions on Magnetics
Cited by: Papers (5)
This paper investigates the resonant bending-mode response of cantilever magnetoelectric (ME) sensors, with focus on the magnetic behavior in an external applied magnetic field, in a theoretical study. A system of coupled linear elastostatic/elastodynamic and electrostatic/magnetostatic equations is solved using 2-D and 3-D finite-element method simulations. The magnetic field is applied at the bo...Show More
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