Solid Angle

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Gerd Leuchs - One of the best experts on this subject based on the ideXlab platform.

  • optical trapping of nanoparticles by full Solid Angle focusing
    OPTICA, 2016
    Co-Authors: Vsevolod Salakhutdinov, Markus Sondermann, Luigi Carbone, E Giacobino, A Bramati, Gerd Leuchs
    Abstract:

    Optical dipole traps are used for trapping and localizing particles in various scientific fields, including classical optics, quantum optics, and biophysics. Here, we propose and implement a dipole trap for nanoparticles that is based on focusing from the full Solid Angle with a deep parabolic mirror. The key aspect is the generation of a linear-dipole mode, which is predicted to provide a tight trapping potential. We demonstrate the trapping of rod-shaped nanoparticles and validate the trapping frequencies to be of the order of the expected ones. The described realization of an optical trap is applicable for various other kinds of Solid-state targets. The obtained results demonstrate the feasibility of optical dipole traps that simultaneously provide high trap stiffness and allow for efficient interaction of light and matter in free space.

  • optical trapping of nanoparticles by full Solid Angle focusing
    arXiv: Optics, 2015
    Co-Authors: Vsevolod Salakhutdinov, Markus Sondermann, Luigi Carbone, E Giacobino, A Bramati, Gerd Leuchs
    Abstract:

    Optical dipole-traps are used in various scientific fields, including classical optics, quantum optics and biophysics. Here, we propose and implement a dipole-trap for nanoparticles that is based on focusing from the full Solid Angle with a deep parabolic mirror. The key aspect is the generation of a linear-dipole mode which is predicted to provide a tight trapping potential. We demonstrate the trapping of rod-shaped nanoparticles and validate the trapping frequencies to be on the order of the expected ones. The described realization of an optical trap is applicable for various other kinds of Solid-state targets. The obtained results demonstrate the feasibility of optical dipole-traps which simultaneously provide high trap stiffness and allow for efficient interaction of light and matter in free space.

  • Full Solid Angle ion-light interface
    CLEO: 2013, 2013
    Co-Authors: Martin Fischer, Robert Maiwald, Andrea Golia, Marianne Bader, Markus Sondermann, Gerd Leuchs
    Abstract:

    We present an optical system covering 81 % of the Solid Angle into which an ion emits light. With this configuration we focus light close to the diffraction limit, while also approaching optimal light matter coupling.

Vsevolod Salakhutdinov - One of the best experts on this subject based on the ideXlab platform.

  • optical trapping of nanoparticles by full Solid Angle focusing
    OPTICA, 2016
    Co-Authors: Vsevolod Salakhutdinov, Markus Sondermann, Luigi Carbone, E Giacobino, A Bramati, Gerd Leuchs
    Abstract:

    Optical dipole traps are used for trapping and localizing particles in various scientific fields, including classical optics, quantum optics, and biophysics. Here, we propose and implement a dipole trap for nanoparticles that is based on focusing from the full Solid Angle with a deep parabolic mirror. The key aspect is the generation of a linear-dipole mode, which is predicted to provide a tight trapping potential. We demonstrate the trapping of rod-shaped nanoparticles and validate the trapping frequencies to be of the order of the expected ones. The described realization of an optical trap is applicable for various other kinds of Solid-state targets. The obtained results demonstrate the feasibility of optical dipole traps that simultaneously provide high trap stiffness and allow for efficient interaction of light and matter in free space.

  • optical trapping of nanoparticles by full Solid Angle focusing
    arXiv: Optics, 2015
    Co-Authors: Vsevolod Salakhutdinov, Markus Sondermann, Luigi Carbone, E Giacobino, A Bramati, Gerd Leuchs
    Abstract:

    Optical dipole-traps are used in various scientific fields, including classical optics, quantum optics and biophysics. Here, we propose and implement a dipole-trap for nanoparticles that is based on focusing from the full Solid Angle with a deep parabolic mirror. The key aspect is the generation of a linear-dipole mode which is predicted to provide a tight trapping potential. We demonstrate the trapping of rod-shaped nanoparticles and validate the trapping frequencies to be on the order of the expected ones. The described realization of an optical trap is applicable for various other kinds of Solid-state targets. The obtained results demonstrate the feasibility of optical dipole-traps which simultaneously provide high trap stiffness and allow for efficient interaction of light and matter in free space.

Qi Zhu - One of the best experts on this subject based on the ideXlab platform.

  • design of a full Solid Angle scanning cylindrical and conical phased array antennas
    IEEE Transactions on Antennas and Propagation, 2017
    Co-Authors: Yulong Xia, Badar Muneer, Qi Zhu
    Abstract:

    In this paper, a full Solid Angle scanning cylindrical-and-conical (CYLCON) conformal phased array antenna (PAA) is designed. First, a microstrip Yagi antenna with low profile and small size is proposed and discussed. Second, a cylindrical conformal Yagi antenna array consisting of 24 aforementioned 8-element Yagi antennas is designed and optimized. Simulation results show that the Yagi antenna array can realize low-elevation beam scanning in the region of $ 0 {^{\circ }} \le \theta \le 30 {^{\circ }}$ , $30 {^{\circ }} \le \varphi \le 150 {^{\circ }}$ with low sidelobe levels and sharp beams. Third, CYLCON conformal microstrip antenna arrays are developed to realize the broadside beam scanning. Afterwards, an integrated PAA by combining the aforementioned conformal arrays along with feeding networks is constructed to achieve full Solid Angle scanning. Finally, a prototype is fabricated, the measured results show that it can realize beam scanning in the regions of $ 0 {^{\circ }} \le \theta \le 30 {^{\circ }}$ , $30 {^{\circ }} \le \varphi \le 150 {^{\circ }}$ , and $30 {^{\circ }} \le \theta \le 180 {^{\circ }}$ , $60 {^{\circ }} \le \varphi \le 120 {^{\circ }}$ , which meet well with those of the simulated. By arranging proper number of arrays along the perimeter accompanied with the switchable feeding configurations, a full Solid Angle scanning can be achieved.

  • A full-Solid-Angle scanning planar phased array
    2016 IEEE International Symposium on Antennas and Propagation (APSURSI), 2016
    Co-Authors: Qi Zhu
    Abstract:

    A full-Solid-Angle (FSA) scanning planar phased array is proposed in this paper. The identical array element is consisting of two identical back-to-back microstrip antennas, which can be controlled independently by a power control unit. To verify the proposed principle, a 4 × 4 elements planar array is designed and simulated. The simulated results demonstrate that the main beam of the array can cover the full-Solid-Angle with gain fluctuation less than 3 dB and the side lobe level is kept less than −8dB compared with the main lobe of the same scanning state.

Sinai Robins - One of the best experts on this subject based on the ideXlab platform.

  • GENERALIZED Solid-Angle THEORY FOR REAL POLYTOPES
    The Quarterly Journal of Mathematics, 2010
    Co-Authors: David Desario, Sinai Robins
    Abstract:

    We extend some theorems from the context of Solid Angle sums over rational polytopes to the context of Solid Angle sums over real polytopes. Moreover, we consider any real dilation parameter, as opposed to the traditional integer dilation parameters. One of the main results is an extension of Macdonald’s Solid Angle quasipolynomial for rational polytopes to a real analytic function of the dilation parameter, for any real convex polytope. Consequently, we find an extension of Macdonald’s reciprocity law for real dilation parameters, over real polytopes.

  • Positivity theorems for Solid-Angle polynomials
    arXiv: Combinatorics, 2009
    Co-Authors: Matthias Beck, Sinai Robins, Steven V Sam
    Abstract:

    For a lattice polytope P, define A_P(t) as the sum of the Solid Angles of all the integer points in the dilate tP. Ehrhart and Macdonald proved that A_P(t) is a polynomial in the positive integer variable t. We study the numerator polynomial of the Solid-Angle series sum_{t >= 0} A_P(t) z^t. In particular, we examine nonnegativity of its coefficients, monotonicity and unimodality questions, and study extremal behavior of the sum of Solid Angles at vertices of simplices. Some of our results extend to more general valuations.

  • A Solid Angle theory for real polytopes
    arXiv: Combinatorics, 2007
    Co-Authors: David Desario, Sinai Robins
    Abstract:

    We extend many theorems from the context of Solid Angle sums over rational polytopes to the context of Solid Angle sums over real polytopes. Moreover, we consider any real dilation parameter, as opposed to the traditional integer dilation parameters. One of the main results is an extension of Macdonald's Solid Angle quasipolynomial for rational polytopes to a real analytic function of the dilation parameter, for any real convex polytope.

Luigi Carbone - One of the best experts on this subject based on the ideXlab platform.

  • optical trapping of nanoparticles by full Solid Angle focusing
    OPTICA, 2016
    Co-Authors: Vsevolod Salakhutdinov, Markus Sondermann, Luigi Carbone, E Giacobino, A Bramati, Gerd Leuchs
    Abstract:

    Optical dipole traps are used for trapping and localizing particles in various scientific fields, including classical optics, quantum optics, and biophysics. Here, we propose and implement a dipole trap for nanoparticles that is based on focusing from the full Solid Angle with a deep parabolic mirror. The key aspect is the generation of a linear-dipole mode, which is predicted to provide a tight trapping potential. We demonstrate the trapping of rod-shaped nanoparticles and validate the trapping frequencies to be of the order of the expected ones. The described realization of an optical trap is applicable for various other kinds of Solid-state targets. The obtained results demonstrate the feasibility of optical dipole traps that simultaneously provide high trap stiffness and allow for efficient interaction of light and matter in free space.

  • optical trapping of nanoparticles by full Solid Angle focusing
    arXiv: Optics, 2015
    Co-Authors: Vsevolod Salakhutdinov, Markus Sondermann, Luigi Carbone, E Giacobino, A Bramati, Gerd Leuchs
    Abstract:

    Optical dipole-traps are used in various scientific fields, including classical optics, quantum optics and biophysics. Here, we propose and implement a dipole-trap for nanoparticles that is based on focusing from the full Solid Angle with a deep parabolic mirror. The key aspect is the generation of a linear-dipole mode which is predicted to provide a tight trapping potential. We demonstrate the trapping of rod-shaped nanoparticles and validate the trapping frequencies to be on the order of the expected ones. The described realization of an optical trap is applicable for various other kinds of Solid-state targets. The obtained results demonstrate the feasibility of optical dipole-traps which simultaneously provide high trap stiffness and allow for efficient interaction of light and matter in free space.