Lithium niobate on insulator: an emerging nanophotonic crystal for optimized light control

• Midhun Murali,
• Amit Banerjee and
• Tanmoy Basu

Beilstein J. Nanotechnol. 2024, 15, 1415–1426, doi:10.3762/bjnano.15.114

• . COMSOL Multiphysics utilizes a finite element analysis (FEM method) approach to simulate physical phenomena involving coupled multi-physics problems. Configuring solvers, running simulations, and the software iteratively solves the coupled system of equations numerically. The geometry has been built in

Enhancing higher-order modal response in multifrequency atomic force microscopy with a coupled cantilever system

• Wendong Sun,
• Jianqiang Qian,
• Yingzi Li,
• Yanan Chen,
• Zhipeng Dou,
• Rui Lin,
• Peng Cheng,
• Xiaodong Gao,
• Quan Yuan and
• Yifan Hu

Beilstein J. Nanotechnol. 2024, 15, 694–703, doi:10.3762/bjnano.15.57

• traditional rectangular cantilever is weaker in air, which affects the sensitivity of multifrequency AFM detection. To address this issue, we previously proposed a bridge/cantilever coupled system model to enhance the higher-order modal response of the cantilever. This model is simpler and less costly than

• other enhancement methods, making it easier to be widely used. However, previous studies were limited to theoretical analysis and preliminary simulations regarding ideal conditions. In this paper, we undertake a more comprehensive investigation of the coupled system, taking into account the influence of

• probe and excitation surface sizes on the modal response. To facilitate the exploration of the effectiveness and optimal conditions for the coupled system in practical applications, a macroscale experimental platform is established. By conducting finite element analysis and experiments, we compare the

Current-induced mechanical torque in chiral molecular rotors

• Richard Korytár and
• Ferdinand Evers

Beilstein J. Nanotechnol. 2023, 14, 711–721, doi:10.3762/bjnano.14.57

• the particle in a static cylindrical system, defined by and introduce it in Equation 3. Without a particle on a path, the dynamics of the rotor will be governed by the kinetic energy and the potential energy V(ϑ). The full Lagrangian of the coupled system becomes It provides two equations of motion

Multiple Fano resonances with flexible tunablity based on symmetry-breaking resonators

• Xiao bin Ren,
• Kun Ren,
• Ying Zhang,
• Cheng guo Ming and
• Qun Han

Beilstein J. Nanotechnol. 2019, 10, 2459–2467, doi:10.3762/bjnano.10.236

• Fano peaks appear in the transmission spectrum after combining two symmetry-breaking cavities with different dimensions. Structure and Theory Figure 1 shows the schematic diagram of the MDM waveguide–cavity coupled system. The inset is the 3D view. The asymmetric cavity that we designed is an off

• transmission characteristics [25][31]. For the studied waveguide–resonator coupled system, the coupling coefficients between ring resonator and input (output) waveguide are denoted by κ1 (κ2). θ1 (θ2) are the phase shift of the coupling coefficient between ring resonator and input (output) waveguide. The decay

• angle is ϕ = 0° and the deviation distance is d = 0. Figure 2 shows the transmission spectra of the designed waveguide–resonator coupled system. Different values of the thickness of the metal wall, t, were studied. When a metal wall is placed in a MDM waveguide, the transmittance is low over a wide

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

• -field sensor based on a MF and a plasmonic structure. As far as we know, the combination of a MF with a plasmonic waveguide has not been reported to date. The unique magnetic-optical properties of MFs are the basis of the optical sensor. The plasmonic structure is a MDM waveguide–cavity coupled system

• (ω − ω1d) + κ1d. From Equation 5, the transmission efficiency of stub–disk coupled system can be expressed as: Neglecting the internal loss κ1, we find the transmission response of stub–disk system to be If there is no disk resonator coupled to the stub, which means there is only one stub resonator

• structures can be derived based on Equation 13. If there is no stub 2, κw2 = 0, then Equation 13 reduces to which is the same as Equation 7. It describes the transmission efficiency of the stub–disk coupled system. If there is no disk, κ1d = 0, then Equation 13 is simplified to Equation 14 (see below). This

Polarization-dependent strong coupling between silver nanorods and photochromic molecules

• Gwénaëlle Lamri,
• Alessandro Veltri,
• Jean Aubard,
• Pierre-Michel Adam,
• Nordin Felidj and
• Anne-Laure Baudrion

Beilstein J. Nanotechnol. 2018, 9, 2657–2664, doi:10.3762/bjnano.9.247

• reflect the quality of the strong coupling between one single nanorod and the molecular exciton. Indeed, even if one single nanorod couples strongly and coherently to an ensemble of molecules, it does not mean that this coupled system can coherently couple to the neighbor coupled systems. This incoherent

Effective sensor properties and sensitivity considerations of a dynamic co-resonantly coupled cantilever sensor

• Julia Körner

Beilstein J. Nanotechnol. 2018, 9, 2546–2560, doi:10.3762/bjnano.9.237

• nanocantilever alters the oscillatory state of the coupled system as a whole and can be detected at the microcantilever. The amplitude response curve of the microcantilever exhibits two resonance peaks and their response to an interaction applied to the sensor depends on the properties of the individual beams

• and the degree of frequency matching. Consequently, while an individual cantilever is characterized by its eigenfrequency, spring constant, effective mass and quality factor, the resonance peaks of the co-resonantly coupled system can be described by effective properties which are a mixture of both

• behaviour it is crucial to derive a description for these effective sensor properties. Results: By modeling the co-resonantly coupled system as a coupled harmonic oscillator and using electromechanical analogies, analytical expressions for the effective sensor properties have been derived and discussed. To

Valley-selective directional emission from a transition-metal dichalcogenide monolayer mediated by a plasmonic nanoantenna

• Haitao Chen,
• Mingkai Liu,
• Lei Xu and
• Dragomir N. Neshev

Beilstein J. Nanotechnol. 2018, 9, 780–788, doi:10.3762/bjnano.9.71

• tune the emission direction of this coupled system by simply changing the circular polarization states of the pumping light. We believe that our scheme could provide useful insight for design of novel component such as couplers and routers in future valley-based information processing devices. Results

• coupled system. Since the valleys in TMDCs can be addressed optically, we can change the emission direction of this TMDC–nanoantenna system by simply changing the circular polarization states of the pumping light. In addition, we discuss the reasons for the reduced directionality when averaging over

3D continuum phonon model for group-IV 2D materials

• Morten Willatzen,
• Lok C. Lew Yan Voon,
• Appala Naidu Gandi and
• Udo Schwingenschlögl

Beilstein J. Nanotechnol. 2017, 8, 1345–1356, doi:10.3762/bjnano.8.136

• that fy obeys the wave equation The solution to this differential equation can be found immediately by imposing the vacuum boundary condition i.e., where 2h is the graphene layer thickness and −h,h define the graphene layer boundaries. We obtain where n = 0,1,2,3,… For the coupled system fx–fz, the

Sub-nanosecond light-pulse generation with waveguide-coupled carbon nanotube transducers

• Felix Pyatkov,
• Svetlana Khasminskaya,
• Vadim Kovalyuk,
• Frank Hennrich,
• Manfred M. Kappes,
• Gregory N. Goltsman,
• Wolfram H. P. Pernice and
• Ralph Krupke

Beilstein J. Nanotechnol. 2017, 8, 38–44, doi:10.3762/bjnano.8.5

• . Light emission from WG-CNT transducers was characterized with both a free-space setup and a fiber-coupled system. The free-space setup allows for the spatial and spectral analysis of light emitted from a transducer along the surface normal. The fiber-coupled system is dedicated to analyzing short light

• calculated values for electroluminescent CNT emitters on a SOI-waveguide by a factor of 1.5 to 2 [21]. Optical pulses from waveguide-coupled CNTs Finally we discuss light-pulse propagation in the waveguide studied with a fiber-coupled system. In contrast to the free-space setup, the fiber-coupled setup

• -resolved, low-intensity signals and an estimation of the emission decay. The light collection efficiency of the fiber-coupled system is several orders of magnitude lower than that of the free-space setup. This is due to the limited bandwidth of the grating coupler (ca. 50 nm) and the lower numerical

Nanostructured TiO₂-based gas sensors with enhanced sensitivity to reducing gases

• Wojciech Maziarz,
• Anna Kusior and
• Anita Trenczek-Zajac

Beilstein J. Nanotechnol. 2016, 7, 1718–1726, doi:10.3762/bjnano.7.164

• importance to consciously design the method of preparation. Another way to improve sensing properties is the combination of two dissimilar materials [32]. For the past few decades, the TiO2/SnO2 coupled system has been a subject of intensive research [18][27][33]. This synergetic system modifies the

• the semiconductor/gas interface. However, due to their small dimensionality and good dispersion on TiO2 substrates, a large number of active sites are created and depletion layer thickness decreases. Our previously proposed sensing mechanism [7] for this semiconductor coupled system remains in good

Signal enhancement in cantilever magnetometry based on a co-resonantly coupled sensor

• Julia Körner,
• Christopher F. Reiche,
• Thomas Gemming,
• Bernd Büchner,
• Gerald Gerlach and
• Thomas Mühl

Beilstein J. Nanotechnol. 2016, 7, 1033–1043, doi:10.3762/bjnano.7.96

• , modeling interactions between the coupled system and external influences. The oscillation of the coupled system is driven by a periodic force applied to the bigger subsystem. In our case, subsystem 1 represents the silicon cantilever and subsystem 2 the FeCNT and, since the cantilever is the part of the

• sensor that will be used for detection, we will discuss the behaviour of the coupled system accordingly. Please note that all the following considerations are valid for the FeCNT as well. Theoretically, if coupled beams are each represented by a harmonic oscillator model which is only valid for one

• observe two clear resonance peaks in the amplitude response of the cantilever (Figure 2). Furthermore, due to strong interplay between the subsystems induced by the co-resonant frequency matching, the two resonance frequencies of the coupled system are shifted compared to the resonance frequencies of the

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

• the coupled system is a linear combination of these three eigenmodes and can be derived using the Haus and Fonstad approach [21]. Refer to Supporting Information File 1 for more details. The parameters of the proposed design are separation distance (s) 200 nm, Li = 5 μm, Lc = 29 μm and Ls = 20 μm

• File 78: More details for the total field of the coupled system. Acknowledgements This work was performed in part at the Queensland node of the Australian National Fabrication Facility (ANFF), a company established under the National Collaborative Research Infrastructure Strategy to provide nano and

Multiscale modeling of lithium ion batteries: thermal aspects

• Arnulf Latz and
• Jochen Zausch

Beilstein J. Nanotechnol. 2015, 6, 987–1007, doi:10.3762/bjnano.6.102

• solution process of each time step with fixed step size of 15 s is as follows: Solve the coupled system for the unknown quantities electrolyte concentration, electrolyte potential, solid potential in the 3D domain. Solve the solid particle diffusion problems for the unknown solid concentration in the 1D

Exploring plasmonic coupling in hole-cap arrays

• Thomas M. Schmidt,
• Maj Frederiksen,
• Vladimir Bochenkov and
• Duncan S. Sutherland

Beilstein J. Nanotechnol. 2015, 6, 1–10, doi:10.3762/bjnano.6.1

• coupling schemes schematically superimposed on the calculated extinction spectra for the elementary cap and hole spectra (right and left respectively) and the coupled system (central). Conclusion We have studied the coupling between elementary cap and hole resonances. The cap/hole system is easy to produce

Nanostructure sensitization of transition metal oxides for visible-light photocatalysis

• Hongjun Chen and
• Lianzhou Wang

Beilstein J. Nanotechnol. 2014, 5, 696–710, doi:10.3762/bjnano.5.82

• up to nearly 80% and open circuit voltages up to the 1 V range [24]. Ho et al. revealed that the CdSe–TiO2 coupled system had a much higher photocatalytic activity than that of pure TiO2 and CdSe in the degradation of 4-chlorophenol under visible light irradiation [34]. Wang et al. reported facet ZnO

Towards a scalable and accurate quantum approach for describing vibrations of molecule–metal interfaces

• David M. Benoit,
• Bruno Madebene,
• Inga Ulusoy,
• Luis Mancera,
• Yohann Scribano and
• Sergey Chulkov

Beilstein J. Nanotechnol. 2011, 2, 427–447, doi:10.3762/bjnano.2.48

• inadequate result for the VSCF approach when compared to the fully coupled system. Finally, the main algorithm used to compute VSCF frequencies is shown in Figure 3. Once the diagonal solutions have been computed, the program reads in the 2-D PES cuts and interpolates them using a bicubic interpolation