A silver-nanoparticle/cellulose-nanofiber composite as a highly effective substrate for surface-enhanced Raman spectroscopy

• Yongxin Lu,
• Yan Luo,
• Zehao Lin and
• Jianguo Huang

Beilstein J. Nanotechnol. 2019, 10, 1270–1279, doi:10.3762/bjnano.10.126

• nanoparticles of the Ag-NP/cellulose-NF–C substrate was conducted by employing the RF module of Comsol Multiphysics, and the parameters adopted were based on the silver nanostructures from the FE-SEM observation, together with the excitation at 514 nm. The optical constants of metallic silver were acquired from

Magnetic-field sensor with self-reference characteristic based on a magnetic fluid and independent plasmonic dual resonances

• Kun Ren,
• Xiaobin Ren,
• Yumeng He and
• Qun Han

Beilstein J. Nanotechnol. 2019, 10, 247–255, doi:10.3762/bjnano.10.23

• consistent with the results in [31]. If there is no disk and no stub 2, κ1d = 0 and κw2 = 0, then Equaiton 13 reduces to which is same as Equation 11. This is exactly the transmission efficiency of a one-stub system. Results and Discussion Numerical simulations were performed by using COMSOL Multiphysics to

Electrostatic force microscopy for the accurate characterization of interphases in nanocomposites

• Diana El Khoury,
• Richard Arinero,
• Jean-Charles Laurentie,
• Mikhaël Bechelany,
• Michel Ramonda and
• Jérôme Castellon

Beilstein J. Nanotechnol. 2018, 9, 2999–3012, doi:10.3762/bjnano.9.279

• experimental results were compared to finite element numerical simulations, obtained with the AC–DC module, electrostatics physics interface, of the Comsol® Multiphysics software. Results and Discussion In our previous work, we verified that EFM can distinguish homogeneous from heterogeneous stacked materials

• -voltage with 200π rad/s pulsation was fixed for all EFM measurements. The results are presented either as frequency shifts (2ω − Δf0), or as the EFM parabolic coefficient α2ω (Hz/V2), where: Numerical simulations Numerical simulations were obtained using the Comsol® Multiphysics software to corroborate

Metal–dielectric hybrid nanoantennas for efficient frequency conversion at the anapole mode

• Valerio F. Gili,
• Lavinia Ghirardini,
• Davide Rocco,
• Giuseppe Marino,
• Ivan Favero,
• Iännis Roland,
• Giovanni Pellegrini,
• Lamberto Duò,
• Marco Finazzi,
• Luca Carletti,
• Andrea Locatelli,
• Aristide Lemaître,
• Dragomir Neshev,
• Costantino De Angelis,
• Giuseppe Leo and
• Michele Celebrano

Beilstein J. Nanotechnol. 2018, 9, 2306–2314, doi:10.3762/bjnano.9.215

• phase opposition) at the fundamental wavelength (λ = 1554 nm). We investigated the scattering characteristics of this structure at near-IR wavelengths by using finite element method (FEM) simulations in COMSOL. The incident light is a plane wave with a wave vector, k, parallel to the cylinder axis and

Optimization of the optical coupling in nanowire-based integrated photonic platforms by FDTD simulation

• Nan Guan,
• Andrey Babichev,
• Martin Foldyna,
• Dmitry Denisov,
• François H. Julien and
• Maria Tchernycheva

Beilstein J. Nanotechnol. 2018, 9, 2248–2254, doi:10.3762/bjnano.9.209

• modes in a GaN nanowire with hexagonal shape calculated using COMSOL [32] mode solver at a wavelength of 400 nm. It is difficult to estimate precisely which modes are excited in an operating core/shell LED. For light propagation simulations, we simulate the light generation in the LED nanowire by

• the NW was 600 nm. The thickness of the spin-on encapsulating layer was 500 nm, and the SiNx waveguide thickness was 500 nm with the width of 10 µm. For these geometrical parameters, separate COMSOL simulations show that the SiNx waveguide sustains a large number of modes (in particular, many modes

Electromigrated electrical optical antennas for transducing electrons and photons at the nanoscale

• Arindam Dasgupta,
• Mickaël Buret,
• Nicolas Cazier,
• Marie-Maxime Mennemanteuil,
• Reinaldo Chacon,
• Kamal Hammani,
• Jean-Claude Weeber,
• Juan Arocas,
• Laurent Markey,
• Gérard Colas des Francs,
• Alexander Uskov,
• Igor Smetanin and
• Alexandre Bouhelier

Beilstein J. Nanotechnol. 2018, 9, 1964–1976, doi:10.3762/bjnano.9.187

• mode supported by the TiO2 waveguides by a two-dimensional finite element calculation (Comsol software) using published values of the refractive index of TiO2[63]. The insets of Figure 6a and Figure 6c display cross-sectional views of the norm of the electric field existing in the waveguides at a

Interaction-tailored organization of large-area colloidal assemblies

• Silvia Rizzato,
• Elisabetta Primiceri,
• Anna Grazia Monteduro,
• Adriano Colombelli,
• Angelo Leo,
• Maria Grazia Manera,
• Roberto Rella and
• Giuseppe Maruccio

Beilstein J. Nanotechnol. 2018, 9, 1582–1593, doi:10.3762/bjnano.9.150

• modelling. A simple 3D model based on finite element analysis was implemented in Comsol Multiphysics software in order to investigate the optical response of single and ordered arrays of different gold nanostructures under the excitation of a uniform p-polarized electromagnetic field. The magnetic

• substrates has been calculated using a numerical model developed in COMSOL. In Figure 5a,b, simulated curves are compared with experimental absorbance spectra of gold nanodisks and nanoholes distributed on glass substrates, respectively. For these samples, the features have an average diameter of 80 nm. Upon

Optical near-field mapping of plasmonic nanostructures prepared by nanosphere lithography

• Gitanjali Kolhatkar,
• Alexandre Merlen,
• Jiawei Zhang,
• Chahinez Dab,
• Gregory Q. Wallace,
• François Lagugné-Labarthet and
• Andreas Ruediger

Beilstein J. Nanotechnol. 2018, 9, 1536–1543, doi:10.3762/bjnano.9.144

• same results. Advanced filter functionality including non-rectangular frequency filters might require a dedicated data analysis software. Simulations The numerical simulations were done with COMSOL Multiphysics using the finite element method. To reproduce the experimental conditions, a 632.8 nm s

• financial support through a Tunisia-INRS scholarship and technical support from CMC Microsystems for COMSOL Multiphysics. The work of A. R. is supported through an NSERC discovery grant.

Cathodoluminescence as a probe of the optical properties of resonant apertures in a metallic film

• Kalpana Singh,
• Evgeniy Panchenko,
• Babak Nasr,
• Amelia Liu,
• Lukas Wesemann,
• Timothy J. Davis and
• Ann Roberts

Beilstein J. Nanotechnol. 2018, 9, 1491–1500, doi:10.3762/bjnano.9.140

• wavelength peak, however, is more strongly dependent on the geometry and is red-shifted for the larger structure. Simulations The finite element method implemented in COMSOL Multiphysics (v 5.3) was used to gain insight into the experimentally obtained CL results shown in Figure 2 and Figure 3. In the model

Nanoporous silicon nitride-based membranes of controlled pore size, shape and areal density: Fabrication as well as electrophoretic and molecular filtering characterization

• Axel Seidenstücker,
• Stefan Beirle,
• Fabian Enderle,
• Paul Ziemann,
• Othmar Marti and
• Alfred Plettl

Beilstein J. Nanotechnol. 2018, 9, 1390–1398, doi:10.3762/bjnano.9.131

• membrane was modeled through the finite element method (FEM) using COMSOL Multiphysics (Comsol Multiphysics GmbH, Göttingen, Germany) (see Supporting Information File 1 for further details). Experiment and model fit very well for all geometries chosen. The remarkably high conductance of the porous

• , COMSOL simulations, approximation for the resistance of a membrane with conical nanopores, serial repair mechanism, real-time fluorescence microscopy, and XPS analysis of CHF3/CF4-etched sample surfaces before and after thermal annealing. Supporting Information File 86: Additional experimental data

Perfusion double-channel micropipette probes for oxygen flux mapping with single-cell resolution

• Yang Gao,
• Bin Li,
• Riju Singhal,
• Adam Fontecchio,
• Ben Pelleg,
• Zulfiya Orynbayeva,
• Yury Gogotsi and
• Gary Friedman

Beilstein J. Nanotechnol. 2018, 9, 850–860, doi:10.3762/bjnano.9.79

• 100 hPa to 116 hPa with of 2–3 hPa increments, and then decreased back to 100 hPa with the same step size. The fluorescent dye plumes in the water droplet were observed and recorded. Finite element model A 3D model was built in COMSOL Multiphysics (v4.4) to evaluate the perfusion probe’s performance

High-contrast and reversible scattering switching via hybrid metal-dielectric metasurfaces

• Jonathan Ward,
• Khosro Zangeneh Kamali,
• Lei Xu,
• Guoquan Zhang,
• Andrey E. Miroshnichenko and
• Mohsen Rahmani

Beilstein J. Nanotechnol. 2018, 9, 460–467, doi:10.3762/bjnano.9.44

• COMSOL Multiphysics in the frequency domain. We assume an undepleted pump approximation and simulate the linear process firstly, and then obtain the nonlinear polarization inside the sample and employ it as a source for the electromagnetic simulation at the harmonic wavelength [43]. Diagram of the

3D Nanoprinting via laser-assisted electron beam induced deposition: growth kinetics, enhanced purity, and electrical resistivity

• Brett B. Lewis,
• Robert Winkler,
• Xiahan Sang,
• Pushpa R. Pudasaini,
• Michael G. Stanford,
• Harald Plank,
• Raymond R. Unocic,
• Jason D. Fowlkes and
• Philip D. Rack

Beilstein J. Nanotechnol. 2017, 8, 801–812, doi:10.3762/bjnano.8.83

• morphological transition from standard EBID-like (darker) to higher purity (bright). COMSOL™ simulation results showing the preferential heating at of the EBID deposit. a) is a plot of the maximum temperatures of both the top and bottom of the pillar at varying growth heights. The radius for the pillars was

Optimizing qPlus sensor assemblies for simultaneous scanning tunneling and noncontact atomic force microscopy operation based on finite element method analysis

• Omur E. Dagdeviren and
• Udo D. Schwarz

Beilstein J. Nanotechnol. 2017, 8, 657–666, doi:10.3762/bjnano.8.70

• throughout this work at typical values of ethick = 100 µm and eover = 40 µm to solely focus on the effect the tip attachment has. All calculations were carried out using the COMSOL Multiphysics 4.4 structural mechanics software package (COMSOL Multiphysics GmbH, Berlin, and Germany). Table 1 summarizes the

Grazing-incidence optical magnetic recording with super-resolution

• Gunther Scheunert,
• Sidney. R. Cohen,
• René Kullock,
• Ryan McCarron,
• Katya Rechev,
• Ifat Kaplan-Ashiri,
• Ora Bitton,
• Paul Dawson,
• Bert Hecht and
• Dan Oron

Beilstein J. Nanotechnol. 2017, 8, 28–37, doi:10.3762/bjnano.8.4

• absorption. Thermal modelling was done in Comsol MultiphysicsTM Version 5.2, using the heat module and the “Deposited Beam Power” feature. A loss of 5% at the DLC surface due to reflection was assumed, describing the case of p-polarized incident light, for which DLC has a particularly low reflectance at 70

• -extent of each medium. Comsol thermal modelling of a Gaussian laser pulse (P = 40 mW; λ = 785 nm; τ = 50 ns, γ = 70°) being absorbed by a thin film stack as in Figure 2a (absorption efficiency: 95%): (a) Temperature of the magnetic layer (Co) as a function of the radius (starting from the center) at the

• (Weizmann Institute of Science) for help with the Comsol modelling, S. Mukhopadhyay (Weizmann Institute of Science) and Daniel Friedrich (University of Würzburg) for support in AFM imaging, M. Emmerling for help with sample preparation (University of Würzburg), and M. Kamp for help with TEM imaging

Nanostructured SnO₂–ZnO composite gas sensors for selective detection of carbon monoxide

• Paul Chesler,
• Cristian Hornoiu,
• Susana Mihaiu,
• Cristina Vladut,
• Jose Maria Calderon Moreno,
• Mihai Anastasescu,
• Carmen Moldovan,
• Bogdan Firtat,
• Costin Brasoveanu,
• George Muscalu,
• Ion Stan and
• Mariuca Gartner

Beilstein J. Nanotechnol. 2016, 7, 2045–2056, doi:10.3762/bjnano.7.195

• . Simulation The Pt heater was simulated in order to optimize the design for uniform heating of the sensor active area and minimizing the power consumption. The COMSOL Multiphysics® finite element analysis (FEA) tool was used for effective modelling/simulation of the heater components for the transducer. The

Analysis of self-heating of thermally assisted spin-transfer torque magnetic random access memory

• Austin Deschenes,
• Sadid Muneer,
• Mustafa Akbulut,
• Ali Gokirmak and
• Helena Silva

Beilstein J. Nanotechnol. 2016, 7, 1676–1683, doi:10.3762/bjnano.7.160

• , current polarity and contact configurations, and to determine how such design choices may enhance thermal assistance for STT-MRAM. Computational details Model We have modeled the electro-thermal behavior of the device using the “COMSOL Multiphysics Finite-Element Modeling” software. Voltage, current, and

• derived using the behavior of similar alloys [10] transposed onto point data [15]. The material properties of the various common passivation materials considered [16] (Table 1) are from the element library of COMSOL for SiO2 and Si3N4, and from literature for low-temperature plasma-enhanced chemical vapor

The role of morphology and coupling of gold nanoparticles in optical breakdown during picosecond pulse exposures

• Yevgeniy R. Davletshin and
• J. Carl Kumaradas

Beilstein J. Nanotechnol. 2016, 7, 869–880, doi:10.3762/bjnano.7.79

• and coupled together using the commercially available finite element package, COMSOL Multiphysics version 4.4. COMSOL Multiphysics is able to solve coupled partial differential equations and ordinary differential equations for arbitrary geometries in the time and frequency domains. The 3D model was

Thermo-voltage measurements of atomic contacts at low temperature

• Ayelet Ofarim,
• Bastian Kopp,
• Thomas Möller,
• León Martin,
• Johannes Boneberg,
• Paul Leiderer and
• Elke Scheer

Beilstein J. Nanotechnol. 2016, 7, 767–775, doi:10.3762/bjnano.7.68

• = 0.15 Ω, which is converted into a temperature difference ΔT using simulations described in the next section. Simulations In order to derive ∆T at the junction from the resistance difference ∆RSens measured between the two sensor leads, finite elements simulations were carried out using COMSOL

• gold structure was placed on a Kapton Cirlex substrate (properties from COMSOL Material Library: Polyimide tape (Kapton HN)) with an additional polyimide layer (properties from COMSOL MEMS module: Polyimide) of 2.5 µm thickness. A Gaussian heat source with 1.5 mW and a diameter of 12 µm (FWHM) was

Highly compact refractive index sensor based on stripe waveguides for lab-on-a-chip sensing applications

• Chamanei Perera,
• Kristy Vernon,
• Elliot Cheng,
• Juna Sathian,
• Esa Jaatinen and
• Timothy Davis

Beilstein J. Nanotechnol. 2016, 7, 751–757, doi:10.3762/bjnano.7.66

• sample length. The sample arm and reference arm are separated from the input arm by a separation distance s, and are uncoupled to each other. This situation can produce only three eigenmodes as shown in Figure 2. For more detail on these eigenmodes and COMSOL simulations refer to [19]. The total field of

• of 633 nm. These simulations were done using COMSOL Multiphysics. SEM images of interferometers with gap separation a) 200 nm and b) 300 nm. The scale bar in the figure represents 10 µm. QD luminescence images of interferometers with 300 nm gap and 200 nm gap when excited via input arm with a 633 nm

Contact-free experimental determination of the static flexural spring constant of cantilever sensors using a microfluidic force tool

• John D. Parkin and
• Georg Hähner

Beilstein J. Nanotechnol. 2016, 7, 492–500, doi:10.3762/bjnano.7.43

• escaping from the microchannel and the cantilevers, we performed finite element method simulations with COMSOL Multiphysics [37]. The mesh independence of the results was confirmed by mesh refinement. The forces applied to the cantilever by the fluid flow were extracted from the simulations. Figure 3

Mapping bound plasmon propagation on a nanoscale stripe waveguide using quantum dots: influence of spacer layer thickness

• Chamanei S. Perera,
• Alison M. Funston,
• Han-Hao Cheng and
• Kristy C. Vernon

Beilstein J. Nanotechnol. 2015, 6, 2046–2051, doi:10.3762/bjnano.6.208

• polarisation (DoP) measurements to prove that QD PL in the vicinity of the metal waveguide is arising from the local excitation of QDs by the propagating plasmon. Our experimental findings are supported by finite element modelling using COMSOL Multiphysics. Authors believe that findings of this work will prove

• beneficial in studying light matter interaction in nanoscale devices and all-optical circuitry. Theory COMSOL Multiphysics was used to run simulations on silver stripe waveguides supported on an indium tin oxide (ITO)-coated glass substrate with poly(methyl methacrylate) (PMMA) cladding. The width of the

Nonlinear optical properties of near-infrared region Ag₂S quantum dots pumped by nanosecond laser pulses

• Li-wei Liu,
• Si-yi Hu,
• Yin-ping Dou,
• Tian-hang Liu,
• Jing-quan Lin and
• Yue Wang

Beilstein J. Nanotechnol. 2015, 6, 1781–1787, doi:10.3762/bjnano.6.182

• scanning spectrophotometer (UV-3101PC from Shimadzu). Figure 1b shows the EDS spectra of Ag2S QDs clearly indicating Ag and S as constituents. The two sharp peaks at 0 and 0.15 keV have no relation to the Ag2S quantum dots, and are caused by a measurement error. COMSOL Multiphysics 4.2a was used to

Attenuation, dispersion and nonlinearity effects in graphene-based waveguides

• Almir Wirth Lima Jr.,
• João Cesar Moura Mota and
• Antonio Sergio Bezerra Sombra

Beilstein J. Nanotechnol. 2015, 6, 1221–1228, doi:10.3762/bjnano.6.125

• less than Lp we used COMSOL to determine the 3D magnetic field pattern of the GSPP propagating mode (L = 250 nm, λ0 = 3 μm, μg = 0.4 eV, σ = 6.786 × 10−8 + i5.282 × 10−5, εr = −26.945 + i0.036, q = 2.104 × 108 + i2.702 × 105), as shown in the top of Figure 6. A transverse cross section through the

• pulses (P0 = 10−9 W). Acknowledgements This work was partly sponsored by the National Council for Scientific and Technological Development (CNPq). We thank Prof. Dr. Victor Dmitriev Alexandrovic (UFPA) for the COMSOL calculations.

Hollow plasmonic antennas for broadband SERS spectroscopy

• Gabriele C. Messina,
• Mario Malerba,
• Pierfrancesco Zilio,
• Ermanno Miele,
• Michele Dipalo,
• Lorenzo Ferrara and
• Francesco De Angelis

Beilstein J. Nanotechnol. 2015, 6, 492–498, doi:10.3762/bjnano.6.50

• exposed polymer is insoluble and remains attached to the membrane, representing an exact replica of the milled structure. Finite element method simulations were performed using the software COMSOL Multiphysics. Raman spectra were recorded with a Renishaw InVia spectrometer using 633 nm and 514 nm laser