Investigations on the optical forces from three mainstream optical resonances in all-dielectric nanostructure arrays

• Guangdong Wang and
• Zhanghua Han

Beilstein J. Nanotechnol. 2023, 14, 674–682, doi:10.3762/bjnano.14.53

• within the confined fields of three optical resonances supported by all-dielectric nanostructure arrays, including toroidal dipole (TD), anapoles, and quasi-bound states in continuum (quasi-BIC) resonances. By elaborately designing the geometry of a slotted-disk array, three different resonances can be

• large contrast in the optical forces generated with these resonances is attributed to a higher electromagnetic field enhancement provided by the quasi-BIC. These results suggest that the quasi-BIC resonance is preferred when one employs all-dielectric nanostructure arrays for the trapping and

• manipulation of nanoparticles by optical forces. It is important to use low-power lasers to achieve efficient trapping and avoid any harmful heating effects. Keywords: all-dielectric nanostructures; anapole; optical force; quasi-bound states in the continuum; toroidal dipole; Introduction Optical forces have

ZnO-decorated SiC@C hybrids with strong electromagnetic absorption

• Liqun Duan,
• Zhiqian Yang,
• Yilu Xia,
• Xiaoqing Dai,
• Jian’an Wu and
• Minqian Sun

Beilstein J. Nanotechnol. 2023, 14, 565–573, doi:10.3762/bjnano.14.47

• that crystalline ZnO particles adhere to the surface of amorphous carbon, and the ZnO content increases as a function of a dosage of ZnNO3·6H2O. The as-prepared SiC@C-ZnO hybrids exhibit effective electromagnetic absorption, which is related to a synergy effect of different dielectric loss processes

• mm). The excellent properties of the materials suggest great prospect as electromagnetic absorbers. Keywords: carbon; dielectric; electromagnetic absorption; SiC nanowires; ZnO; Introduction With increasing functionality of electronic devices, the widening of the working frequency bands, and the

• stability, chemical corrosion resistance, and high strength. Hence, it has received a lot of attention [5][6][7]. Because of the high resistivity and the low dielectric parameters of traditionally prepared SiC, its EM absorption is poor [8]. According to existing literature reports, the electromagnetic

Carbon nanotube-cellulose ink for rapid solvent identification

• Tiago Amarante,
• Thiago H. R. Cunha,
• Claudio Laudares,
• Ana P. M. Barboza,
• Ana Carolina dos Santos,
• Cíntia L. Pereira,
• Vinicius Ornelas,
• Bernardo R. A. Neves,
• André S. Ferlauto and
• Rodrigo G. Lacerda

Beilstein J. Nanotechnol. 2023, 14, 535–543, doi:10.3762/bjnano.14.44

• two important properties of the liquids, namely dielectric constant and vapor pressure, on the transduction of the MFC-MWCNT sensors. These results were corroborated by independent heat flow measurements (thermogravimetric analysis). The proposed MFC-MWCNT sensor platform may help paving the way to

• mechanism of polymer composites with physicochemical characteristics such as dielectric constant, specific heat, and vapor pressure [25][56][57]. Our ink-based devices could extract those characteristics even from unknown samples and mixtures. Finally, test analysis using principal component analysis (PCA

• ) with physicochemical properties of the organic solvents (vapor pressure and dielectric constant) [63][64]. Guided by previous studies that show the electrical response is due to the swelling of CPCs [25][56][57], we found that the maximum value in the Gain curve (max) is proportional to the dielectric

Plasmonic nanotechnology for photothermal applications – an evaluation

• A. R. Indhu,
• L. Keerthana and
• Gnanaprakash Dharmalingam

Beilstein J. Nanotechnol. 2023, 14, 380–419, doi:10.3762/bjnano.14.33

• arrival at the expression for the LSPR frequency of a free electron cloud (as is typically assumed to be present in metals) starts with the relations between the dielectric displacement (D) of the electron gas in relation to the incident electric field (E) which it is [38] subjected to, given by wherein P

• is the polarization density. P can be arrived at by solving the equation of motion for a single electron as Hence the expression relating the dielectric displacement (D) and the external electric field can be obtained as where is the natural frequency of oscillation of the electron cloud. Comparing

• product of ωτ, where τ is the relaxation time of the free electron gas) is much higher than unity, thus leading to an approximation that there is no damping. Hence ignoring the damping term in Equation 5, we get It follows also that under plasmon resonance conditions ε1 < −εm, εm is the dielectric

Quasi-guided modes resulting from the band folding effect in a photonic crystal slab for enhanced interactions of matters with free-space radiations

• Kaili Sun,
• Yangjian Cai,
• Uriel Levy and
• Zhanghua Han

Beilstein J. Nanotechnol. 2023, 14, 322–328, doi:10.3762/bjnano.14.27

• are introduced into large-scale periodic structures [1]. Extremely high Q-factors can be achieved thanks to the bandgap associated with the periodic structure, which prevents the leakage of radiation into the surrounding environment. Whispering gallery modes supported by dielectric spheres or

• . Plasmonic nanoantennas [3], although with relatively low Q-factors resulting from material dissipation, still provide a large level of field enhancement due to the deep-subwavelength level of mode confinement. As new alternatives to plasmonic nanostructures, all-dielectric nanostructures supporting Mie

• have been demonstrated in all aspects of light–matter interactions, ranging from optical generation [6], propagation [7], nonlinear processes [8] to signal detection [9] and collection, to name a few. Although QBIC resonances in all-dielectric nanostructures have become a popular and mainstream

Bismuth-based nanostructured photocatalysts for the remediation of antibiotics and organic dyes

• Akeem Adeyemi Oladipo and
• Faisal Suleiman Mustafa

Beilstein J. Nanotechnol. 2023, 14, 291–321, doi:10.3762/bjnano.14.26

• photocatalytic activity [101][102][103][104]. Bi2WO6 has an orthorhombic structure, a high Curie temperature of about 900 °C, and a narrow bandgap of 2.6–2.8 eV [103]. Other desirable physical and chemical characteristics of Bi2WO6 include comparatively low toxicity, piezoelectricity, non-linear dielectric

Concentration-dependent photothermal conversion efficiency of gold nanoparticles under near-infrared laser and broadband irradiation

• Vikas,
• Raj Kumar and
• Sanjeev Soni

Beilstein J. Nanotechnol. 2023, 14, 205–217, doi:10.3762/bjnano.14.20

• ]. Localized heat generation through GNPs under irradiation can be used for hyperthermia treatment of tumors, termed plasmonic photothermal therapy (PPTT) [7][8][9][10][11]. The net temperature rise of a GNP-containing medium highly depends on shape and size of the GNPs, the dielectric constant of the medium

High–low Kelvin probe force spectroscopy for measuring the interface state density

• Ryo Izumi,
• Masato Miyazaki,
• Yan Jun Li and
• Yasuhiro Sugawara

Beilstein J. Nanotechnol. 2023, 14, 175–189, doi:10.3762/bjnano.14.18

• on the semiconductor surface and ε0 is the dielectric constant of vacuum. A bias voltage Vdc + Vac·cos 2πft is applied between the tip and the semiconductor sample, where Vdc, Vac, and f are the DC bias voltage, amplitude of the AC bias voltage, and modulation frequency of the AC bias voltage

• dielectric constant. LD is the Debye length for majority carriers (electrons), which characterizes the change in the potential inside the semiconductor. kB, T and e are the Boltzmann constant, absolute temperature, and elementary charge (e > 0), respectively. Since the applied voltage V is divided between

A distributed active patch antenna model of a Josephson oscillator

• Vladimir M. Krasnov

Beilstein J. Nanotechnol. 2023, 14, 151–164, doi:10.3762/bjnano.14.16

• analysis by introducing the total quality factor, Qtot, of the cavity mode with parallel dissipative and radiative channels, Here, Qdis is associated with all possible dissipative losses, such as QP resistance in the JJ as well as surface resistance in electrodes and dielectric losses while Qrad represents

• and dielectric losses in the junction barrier and surface resistance in electrodes. According to Equation 37, Rdis is defined via the effective quality factor, Qdis, which can be written as: where QQP, Qsurf and Qdiel are determined by QP, surface, and dielectric losses, respectively. QP and surface

• , Rsurf ≪ ωL*, and , we obtain Dielectric losses in the AlOx barrier of a JJ were estimated in [43]. At f ≃ 10 GHz, Qdiel ≈ 104. Although it should decrease at f = 400 GHz, we anticipate that it is still in the range of ca. 103. Therefore, dielectric losses are negligible, compared to QP and surface loses

Batch preparation of nanofibers containing nanoparticles by an electrospinning device with multiple air inlets

• Dong Wei,
• Chengwei Ye,
• Adnan Ahmed and
• Lan Xu

Beilstein J. Nanotechnol. 2023, 14, 141–150, doi:10.3762/bjnano.14.15

• density of spinning solution (kg/m3), g is the gravitational acceleration (m/s2), h is the fluctuation height of the polymer spinning solution (m), γ is the surface tension coefficient of the spinning solution (N/m), ε0 is vacuum dielectric constant, E0 is the edge electric field intensity (V/m), Ep is

• the electric field intensity of the thin liquid surface (V/m), εα is the dielectric constant of the polymer, and k is the amount of radial fluctuations on the spinning solution surface. In addition, the centripetal force F1 at point B is generated by the horizontal component of the viscous force (τ

Characterisation of a micrometer-scale active plasmonic element by means of complementary computational and experimental methods

• Ciarán Barron,
• Giulia Di Fazio,
• Samuel Kenny,
• Silas O’Toole,
• Robin O’Reilly and
• Dominic Zerulla

Beilstein J. Nanotechnol. 2023, 14, 110–122, doi:10.3762/bjnano.14.12

• polaritons (SPPs) are mixed states of photons and electron density waves propagating along the interface between a conductor and a dielectric. As a result of this phenomenon, an electric field strongly confined in the z-direction is produced at the interface. As direct excitation of a smooth metallic surface

• presence of an optically denser dielectric material with which the light interacts before reaching the metal. Light–matter interactions which give rise to the formation of SPPs can be classified into a sub-field of photonics known as plasmonics [8]. Investigations into SPPs provide vital insights into

• ) investigating the changes in the reflectivity induced by a modulated electric current. The acquisition of a surface plasmon resonance (SPR) curve is a common method to characterise a plasmonic far-field response [31] which is highly sensitive to small changes in the refractive index of the metal and dielectric

Solvent-induced assembly of mono- and divalent silica nanoparticles

• Bin Liu,
• Etienne Duguet and
• Serge Ravaine

Beilstein J. Nanotechnol. 2023, 14, 52–60, doi:10.3762/bjnano.14.6

• Instruments). The dielectric constant of water was set to 80.4 and the Smoluchowsky constant f(ka) was 1.5. Synthetic route for the preparation of 1-PSN with a controlled patch-to-particle size ratio. TEM images of the silica/PS monopods after (a) 0, (b) 1, (c) 2, (d) 4, (e) 9, and (f) 14 iterative silica

Induced electric conductivity in organic polymers

• Konstantin Y. Arutyunov,
• Anatoli S. Gurski,
• Vladimir V. Artemov,
• Alexander L. Vasiliev,
• Azat R. Yusupov,
• Danfis D. Karamov and
• Alexei N. Lachinov

Beilstein J. Nanotechnol. 2022, 13, 1551–1557, doi:10.3762/bjnano.13.128

• conditions, PDP is a wide-gap dielectric material and is characterized by the following parameters: band gap ≈4.3 eV, electronic work function ≈4.2 eV, electron affinity ≈2 eV, first ionization potential ≈6.2 eV. Experimental evaluations of the electronic parameters of PDP have been made earlier by various

• solution of specified concentration was applied onto the dielectric substrate fixed on a centrifuge holder. The rotation speed was typically 2000 rpm. The resulting polymer film was dried in air for about 45–60 min at room temperature. Then the final drying was carried out to remove solvent residues at a

• the voltage corresponding to the transition point from linear to parabolic dependency of the I–V’s, n0 is the equilibrium concentration of charge carriers, ε and ε0 dielectric constants of the polymer and vacuum, respectively, and μ is the maximum mobility of charge carriers. According to this model

Photoelectrochemical water oxidation over TiO₂ nanotubes modified with MoS₂ and g-C₃N₄

• Phuong Hoang Nguyen,
• Thi Minh Cao,
• Tho Truong Nguyen,
• Hien Duy Tong and
• Viet Van Pham

Beilstein J. Nanotechnol. 2022, 13, 1541–1550, doi:10.3762/bjnano.13.127

• Mott–Schottky relationship involving the apparent capacitance as a function of the potential under depletion conditions [54]: where C, ε, ε0, N, A, Va, Vfb, k, and T are the capacitance of the space charge region, the dielectric constant of the semiconductor, the vacuum permittivity, the donor density

Structural studies and selected physical investigations of LiCoO₂ obtained by combustion synthesis

• Monika Michalska,
• Paweł Ławniczak,
• Tomasz Strachowski,
• Adam Ostrowski and
• Waldemar Bednarski

Beilstein J. Nanotechnol. 2022, 13, 1473–1482, doi:10.3762/bjnano.13.121

• with silver paste (Hans Wolbring GmbH) to form electrodes. IS measurements were performed using a Novocontrol AlphaA Broadband Dielectric/Impedance Spectrometer (Novocontrol GmbH) at room temperature. Measurements were carried out in the frequency range from 1 Hz to 1 MHz with an oscillation voltage of

Coherent amplification of radiation from two phase-locked Josephson junction arrays

• Mikhail A. Galin,
• Vladimir M. Krasnov,
• Ilya A. Shereshevsky,
• Nadezhda K. Vdovicheva and
• Vladislav V. Kurin

Beilstein J. Nanotechnol. 2022, 13, 1445–1457, doi:10.3762/bjnano.13.119

• working similar to lasers is discussed in more detail in [8]. The resonator can be a cavity of the JJs itself [2], an electrode with embedded JJs [9], or the dielectric substrate on which the JJ array is arranged [10]. Coherent superradiant amplification of emitted power is caused by a constructive

• dielectric permittivity of silicon). Under this condition, the fundamental resonant mode can be excited in the substrate between the arrays. This condition is beneficial for inter-array coupling. Numerical Calculations The experimental results presented above show that phase locking of two large JJ arrays is

• contains two identical JJ arrays arranged on a common substrate with a dielectric permittivity of ε = 12, close to that of silicon. The lateral dimensions of the substrate are 2 × 0.6 mm while the thickness is 0.3 mm. We chose such a narrow substrate to avoid excitation of transverse resonant modes inside

Double-layer symmetric gratings with bound states in the continuum for dual-band high-Q optical sensing

• Chaoying Shi,
• Jinhua Hu,
• Xiuhong Liu,
• Junfang Liang,
• Jijun Zhao,
• Haiyan Han and
• Qiaofen Zhu

Beilstein J. Nanotechnol. 2022, 13, 1408–1417, doi:10.3762/bjnano.13.116

• resonance. We find that the artificial bound states in the continuum (BIC) and Fabry–Pérot BIC (FP-BIC) can be induced by optimizing structural parameters of DLSG. Interestingly, the artificial BIC is governed by the spacing between the two rectangular dielectric gratings, while the FP-BIC is achieved by

• researchers have focused their interests on the single high-Q resonance of various structures and proposed different types of structures to achieve high-Q-factors, such as metallic structures based on surface plasmon resonances [5][6], Mie resonance-based dielectric structures [7][8], and high-contrast

• infinite structure or in extreme values of the parameters [25][26]. The structures that are commonly used to induce the BIC include metasurfaces [27][28], dielectric gratings [29][30], photonic crystals [31], and whispering-gallery resonators [32]. In 2016, Wang et al. investigated a symmetry-protected BIC

LED-light-activated photocatalytic performance of metal-free carbon-modified hexagonal boron nitride towards degradation of methylene blue and phenol

• Nirmalendu S. Mishra and
• Pichiah Saravanan

Beilstein J. Nanotechnol. 2022, 13, 1380–1392, doi:10.3762/bjnano.13.114

• –Schottky analysis through the following equations [28][31][32]. where Csc, e, A, ε, ε0, kB, and T indicate the capacitance of the space charge region, charge of an electron, active area of the electrode, dielectric constant, permittivity of free space, Boltzmann’s constant, and absolute temperature

Enhanced electronic transport properties of Te roll-like nanostructures

• E. R. Viana,
• N. Cifuentes and
• J. C. González

Beilstein J. Nanotechnol. 2022, 13, 1284–1291, doi:10.3762/bjnano.13.106

• vacuum, εav = 1.95 is the averaged relative permittivity of the SiO2/air interface of the FET [19][29]. Also, w = 550 nm, t = 50 nm, and L = 5.97 µm are the diameter of the nanostructure, the thickness of the nanostructure, and the length of the FET channel, respectively. The thickness of the dielectric

A super-oscillatory step-zoom metalens for visible light

• Yi Zhou,
• Chao Yan,
• Peng Tian,
• Zhu Li,
• Yu He,
• Bin Fan,
• Zhiyong Wang,
• Yao Deng and
• Dongliang Tang

Beilstein J. Nanotechnol. 2022, 13, 1220–1227, doi:10.3762/bjnano.13.101

• field at the subwavelength scale [16][17][18][19][20][21][22]. Compared with metallic metasurfaces, all-dielectric metasurfaces are characterized by high amplitude transmittance, which is important for super-oscillatory lenses with comparatively low focusing efficiency. Generally, for all-dielectric

Application of nanoarchitectonics in moist-electric generation

• Jia-Cheng Feng and
• Hong Xia

Beilstein J. Nanotechnol. 2022, 13, 1185–1200, doi:10.3762/bjnano.13.99

• cylindrical, the potential change (ΔV) is given by [10]: where ε is the dielectric constant of the fluid, ε0 is the vacuum permittivity, R is the flow resistance of the channel, ζ is the zeta potential of the ionic double layer on the channel surfaces, η is the liquid viscosity, C is the ionic concentration

• resistance and surface potential, directly contribute to the flow potential. At the same time, the parameters of the fluid in the nanochannel, such as dielectric constant and ion concentration, are directly related to the magnitude of the flow potential. In the nanochannel, the flow velocity ν of the fluid

• interaction. The actual charge transfer is much more complicated, involving the contact angle, dielectric function, temperature, and ion concentration [15][16][17]. In MEGs, compared to bulk materials, nanoarchitectonics yields a higher specific surface area to the active material, which makes the contact

Analytical and numerical design of a hybrid Fabry–Perot plano-concave microcavity for hexagonal boron nitride

• Felipe Ortiz-Huerta and
• Karina Garay-Palmett

Beilstein J. Nanotechnol. 2022, 13, 1030–1037, doi:10.3762/bjnano.13.90

• the desired shape. A natural extension to the development of polymer photonic structures consists of the fabrication of hybrid (i.e., metal-dielectric) resonant structures [15] with the potential to enhance the light–matter interactions of such SPEs. This work will focus on finding an optimal design

• known as the q-parameters for the Gaussian beams, where z2 = L2 − Lp, z1 = L1 and zR,1,2 is the Rayleigh length for each beam. For a Gaussian beam passing through a plane dielectric interface, we have A = B = C = 0, and D = n2/n1, where n1 = 1 is the refractive index of the air gap, therefore, by

• + DBR system a L(HL)15 dielectric stack. A transfer matrix model [24] was used to calculate the electric field distribution inside the hBN + DBR system (Figure 6). The full transfer matrix S of our microcavity is defined as: where L and I represent the transfer and interface matrix, respectively, of the

Numerical study on all-optical modulation characteristics of quantum cascade lasers

• Biao Wei,
• Haijun Zhou,
• Guangxiang Li and
• Bin Tang

Beilstein J. Nanotechnol. 2022, 13, 1011–1019, doi:10.3762/bjnano.13.88

• physics in QCL’s gain medium which consists of multiple of dielectric nanostructures with high refractive index under light injection, we modified the 1½-period model to calculate values of electron population and lifetime in each subband which is separated by the nanostructures, optical gain, current and

• optimizing its use and dielectric nanostructure design. Keywords: all-optical modulation; dielectric nanostructures; high refractive index materials; numerical study; quantum cascade lasers; Introduction The quantum cascade laser (QCL) was invented nearly 30 years ago [1], and its cavity consists of

• simulation, it would be very helpful for optimizing its use and dielectric nanostructure design. Although there has been much research on all-optical modulation of QCLs, only optical injection locking [14] and quenching [15][16] can currently provide one-sided numerical support. Based on the classical 1

Theoretical investigations of oxygen vacancy effects in nickel-doped zirconia from ab initio XANES spectroscopy at the oxygen K-edge

• Dick Hartmann Douma,
• Lodvert Tchibota Poaty,
• Alessio Lamperti,
• Stéphane Kenmoe,
• Abdulrafiu Tunde Raji,
• Alberto Debernardi and
• Bernard M’Passi-Mabiala

Beilstein J. Nanotechnol. 2022, 13, 975–985, doi:10.3762/bjnano.13.85

• which is being currently employed in ultra-scaled electronics for its high dielectric constant [24][25] have received significant attention because of its practical applications. Thus, recently, exploiting first principles simulations and X-ray absorption near edge spectroscopy (XANES) in high magnetic

Comparing the performance of single and multifrequency Kelvin probe force microscopy techniques in air and water

• Jason I. Kilpatrick,
• Emrullah Kargin and
• Brian J. Rodriguez

Beilstein J. Nanotechnol. 2022, 13, 922–943, doi:10.3762/bjnano.13.82

• dielectric media and do not consider additional properties such as electrodynamics or the effect of the tip–sample position relative to the position of the double layer. (3) We only compare frequency responses off resonance, ωoff, and for the first two eigenmodes of the cantilever and combinations thereof