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Absolute characterization of high numerical aperture microscope objectives utilizing a dipole scatterer

Light(science & Applications) 2021年第12期10卷 2342-2348页

作者： jörg s.eismann Martin Neugebauer Klaus Mantel Peter Banzer Institute of Physics University of GrazNAWI GrazUniversitätsplatz 58010 GrazAustria Max Planck Institute for the science of Light Staudtstr.291058 ErlangenGermany Institute of Optics Information and PhotonicsUniversity Erlangen-NurembergStaudtstr.7/B291058 ErlangenGermany

Measuring the aberrations of optical systems is an essential step in the fabrication of high precision optical *** a characterization is usually based on comparing the device under investigation with a calibrated reference ***,when working at the cutting-edge of technology,it is increasingly difficult to provide an even better or well-known reference *** this manuscript we present a method for the characterization of high numerical aperture microscope objectives,functioning without the need of calibrated reference *** technique constitutes a nanoparticle,acting as a dipole-like scatterer,that is placed in the focal volume of the microscope *** light that is scattered by the particle can be measured individually and serves as the reference wave in our *** the well-characterized scattered light as nearly perfect reference wave is the main idea behind this manuscript.

关键词： characterization scatter scattered

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Experimental demonstration of linear and spinning janus dipoles for polarisation-and wavelength-selective near-field coupling

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Light(science & Applications) 2019年第1期8卷 732-738页

作者： Michela F.Picardi Martin Neugebauer jorg s.eismann Gerd Leuchs Peter Banzer Francisco j.Rodriguez-Fortuno Anatoly V.Zayats Department of Physics and London Centre for Nanotechnology King’s College LondonStrandLondon WC2R Ls UK.2Max Planck Institute for the Science of LightStaudtstr.2D-91058 ErlangenGermany Institute of Optics Information and PhotonicsUniversity Erlangen-NurembergStaudtstr.7/B2D-91058 ErlangenGermany

The electromagnetic field scattered by nano-objects contains a broad range of wavevectors and can be efficiently coupled to waveguided *** dominant contribution to scattering from subwavelength dielectric and plasmonic nanoparticles is determined by electric and magnetic dipolar ***,we experimentally demonstrate spectral and phase selective excitation of janus dipoles,sources with electric and magnetic dipoles oscillating out of phase,in order to control near-field interference and directional coupling to *** show that by controlling the polarisation state of the dipolar excitations and the excitation wavelength to adjust their relative contributions,directionality and coupling strength can be fully ***,we introduce a novel spinning janus dipole featuring cylindrical symmetry in the near and far field,which results in either omnidirectional coupling or *** the propagation of guided light waves via fast and robust near-field interference between polarisation components of a source is required in many applications in nanophotonics and quantum optics.

关键词： coupling spinning excitation

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Ponseti method compared with soft-tissue release for the management of clubfoot:A meta-analysis study

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World journal of Orthopedics 2013年第3期4卷 144-153页

作者： Marios G Lykissas Alvin H Crawford Emily A eismann junichi Tamai Division of Pediatric Orthopaedic surgery Cincinnati Children’s Hospital Medical CenterCincinnatiOH 45229United States

AIM: To compare the functional outcomes of patients who underwent open surgery vs Ponseti method for the management of idiopathic clubfoot and to determine whether correlations exist between functional outcome and radiographic ***: A meta-analysis of the literature was conducted for studies concerning primary treatment of patients with idiopathic clubfoot. We searched PubM ed Medline, EMBAsE, and the Cochrane Library databases from january 1950 to October 2011. Meta-analyses were performed on outcomes from 12 studies. Pooled means, sDs, and sample sizes were either identified in the results or calculated based on the results of each ***: Overall, 835 treated idiopathic clubfeet in 516 patients were reviewed. The average follow-up was 15.7 years. Patients managed with Ponseti method did have a higher rate of excellent or good outcome than patients treated with open surgery(0.76 and 0.62, respectively), but not quite to the point of statistical significance(Q = 3.73, P = 0.053). Age at surgery wasnot correlated with the functional outcome for the surgically treated patients(r =-0.32, P = 0.68). A larger anteroposterior talocalcaneal angle was correlated with a higher rate of excellent or good outcomes(r = 0.80, P = 0.006). There were no other significant correlations between the functional and radiographic ***: The Ponseti method should be considered the initial treatment of idiopathic clubfeet, and open surgery should be reserved for clubfeet that cannot be completely corrected.

关键词： Idiopathic clubfoot Congenital talipes equinovarus Ponseti method surgical release Ponseti-Laaveg score

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