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

• numerical results to compare the optical trapping capability provided by all-dielectric nanostructures based on the excitation of these three different modes. Using an array of high-index silicon disks with elaborately designed slots, all these three resonances can be supported by the same platform. The

• isolated nanostructures, further investigation needs to be performed for a better comparison. In conclusion, to the best of our knowledge, we systematically investigated for the first time and compared the optical trapping capability of three mainstream optical resonances that can be supported by all

Thermophoretic tweezers for single nanoparticle manipulation

• Jošt Stergar and
• Natan Osterman

Beilstein J. Nanotechnol. 2020, 11, 1126–1133, doi:10.3762/bjnano.11.97

• substrate. Thermo-optical trapping of a 200 nm polystyrene particle in water (Plas = 44 mW). (a) 2D histogram of particle positions. (b) Histogram of x- and y-positions. (c) Corresponding trap potentials in x- and y-directions obtained from (b), fitted with parabolic functions. Simulation results: (a

Integrated photonics multi-waveguide devices for optical trapping and Raman spectroscopy: design, fabrication and performance demonstration

• Gyllion B. Loozen,
• Arnica Karuna,
• Mohammad M. R. Fanood,
• Erik Schreuder and
• Jacob Caro

Beilstein J. Nanotechnol. 2020, 11, 829–842, doi:10.3762/bjnano.11.68

• International B.V., P.O. Box 456, 7500 AL, Enschede, Netherlands 10.3762/bjnano.11.68 Abstract We realized integrated photonics multi-waveguide devices for optical trapping and Raman spectroscopy of particles in a fluid. In these devices, multiple beams directed towards the device center lead to a local field

• waveguides. Keywords: Brownian motion; integrated optics devices; lab-on-a-chip; optical trapping; nanofabrication; Raman spectroscopy; ridge waveguides; Introduction Photonic lab-on-a-chip (LOC) techniques strongly attract attention for the manipulation and measurement of biological particles such as

• bacteria and various types of biological cells [1]. In this context, LOC devices for optical trapping and Raman spectroscopy are very promising. An ultimate goal for such LOC devices is on-the-spot identification of single biological particles by Raman spectroscopy using a chip-based portable system. These

Surface characterization of nanoparticles using near-field light scattering

• Eunsoo Yoo,
• Yizhong Liu,
• Chukwuazam A. Nwasike,
• Sebastian R. Freeman,
• Brian C. DiPaolo,
• Bernardo Cordovez and
• Amber L. Doiron

Beilstein J. Nanotechnol. 2018, 9, 1228–1238, doi:10.3762/bjnano.9.114

• it is generated by both the optical trapping force and surface repulsion of the nanoparticle [23]. The motion and behavior, i.e., velocity and local scattering intensity, of trapped nanoparticles is characteristic of the particle properties. When nanoparticles are trapped, the local refractive index

• optical trapping force, Ftrap = [(2πα/c)·(∂I/∂z)], where z is the particle–waveguide separation, F0 is the force required to completely compress the coating whereby the particle touchs the waveguide, γ is the Fcoat force decay constant, α is the particle polarizability, c is the speed of light, and I is

• acting on the particle. (B, C) Trapped particles with different surface properties move along the waveguide with an equilibrium height determined by the balance of surface repulsion and optical trapping forces. TEM images of uncoated SPIOs (A), PEG-SPIOs (B) with scale bar of 20 nm. EDS spectrum of

Reorientation of single-wall carbon nanotubes in negative anisotropy liquid crystals by an electric field

• Amanda García-García,
• Ricardo Vergaz,
• José F. Algorri,
• Gianluigi Zito,
• Teresa Cacace,
• Antigone Marino,
• José M. Otón and
• Morten A. Geday

Beilstein J. Nanotechnol. 2016, 7, 825–833, doi:10.3762/bjnano.7.74

• important because high power may cause optical trapping [29]. The optical trapping power depends on several factors (e.g., SWCNT length-to-diameter ratio, dispersed material) [30]. Therefore, the incident beam power was checked several times to avoid the optical trapping effect in this specific study. The

Single-molecule mechanics of protein-labelled DNA handles

• Vivek S. Jadhav,
• Dorothea Brüggemann,
• Florian Wruck and
• Martin Hegner

Beilstein J. Nanotechnol. 2016, 7, 138–148, doi:10.3762/bjnano.7.16

• TICO buffer. However, a strong tendency of unfavourable bead clustering was witnessed in the microfluidic channel of our flow cell when DNA tethering and optical trapping were performed in high Mg TICO buffer. For future experiments involving the ribosomal machinery we therefore recommend the use of

Statistics of work and orthogonality catastrophe in discrete level systems: an application to fullerene molecules and ultra-cold trapped Fermi gases

• Antonello Sindona,
• Michele Pisarra,
• Mario Gravina,
• Cristian Vacacela Gomez,
• Pierfrancesco Riccardi,
• Giovanni Falcone and
• Francesco Plastina

Beilstein J. Nanotechnol. 2015, 6, 755–766, doi:10.3762/bjnano.6.78

• efficiently describe an ultra-cold Fermi gas probed by a two-level impurity, with the parabolic potential mimicking the magneto-optical trapping potential, may be found for example in [25][28][31][32][48]. Let us further assume that the perturbation is spatially structure-less and localized at the center of

3D nano-structures for laser nano-manipulation

• Gediminas Seniutinas,
• Lorenzo Rosa,
• Gediminas Gervinskas,
• Etienne Brasselet and
• Saulius Juodkazis

Beilstein J. Nanotechnol. 2013, 4, 534–541, doi:10.3762/bjnano.4.62

• ; Introduction Optical trapping is a fundamental experimental technique for physics and biology, which allows to precisely control and position micrometer-sized objects such as dielectric parts for nano-assembly, and biomaterials such as cells and bacteria, through the use of gradient forces, which originate

• employed the full-3D vectorial model to numerically determine the optical trapping force F(r,ω) = experienced by the bead, which is usually approximated in theory as an optical dipole oscillator, in the vicinity of a nano-well, where (α′ + iα″) is the polarizability at the angular frequency ω (linked to