Mr. Yaakov Lumer Profile

Yaakov Lumer

PhD Student at Technion-Israel Institute of Technology

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Publications (6)

Proceedings Article | 3 October 2022 Presentation

Photonic time-crystals (Conference Presentation)

Mordechai (Moti) Segev, Eran Lustig, Alex Dikopoltsev, Yonatan Sharabi, Mark Lyubarov, Ohad Segal, Yaakov Lumer

Proceedings Volume PC12195, PC1219518 (2022) https://doi.org/10.1117/12.2633305

KEYWORDS: Photonic crystals, Modulation, Tunable lasers, Refractive index, Light, Electrons, Dielectrics, Crystals, Chemical species

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Proceedings Article | 11 September 2013 Paper

Photonic Floquet topological insulators

Mikael Rechtsman, Julia Zeuner, Yonatan Plotnik, Yaakov Lumer, Daniel Podolsky, Felix Dreisow, Stefan Nolte, Mordechai Segev, Alexander Szameit

Proceedings Volume 8808, 880815 (2013) https://doi.org/10.1117/12.2023842

KEYWORDS: Waveguides, Dielectrics, Light wave propagation, Light scattering, Scattering, Photonic crystals, Magnetism, Electrons, Photons, Graphene

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Topological insulators are a new phase of matter, with the striking property that conduction of electrons occurs only on the surface. In two dimensions, surface electrons in topological insulators do not scatter despite defects and disorder, providing robustness akin to superconductors. Topological insulators are predicted to have wideranging applications in fault-tolerant quantum computing and spintronics. Recently, large theoretical efforts were directed towards achieving topological insulation for electromagnetic waves. One-dimensional systems with topological edge states have been demonstrated, but these states are zero-dimensional, and therefore exhibit no transport properties. Topological protection of microwaves has been observed using a mechanism similar to the quantum Hall effect, by placing a gyromagnetic photonic crystal in an external magnetic field. However, since magnetic effects are very weak at optical frequencies, realizing photonic topological insulators with scatterfree edge states requires a fundamentally different mechanism - one that is free of magnetic fields. Recently, a number of proposals for photonic topological transport have been put forward. Specifically, one suggested temporally modulating a photonic crystal, thus breaking time-reversal symmetry and inducing one-way edge states. This is in the spirit of the proposed Floquet topological insulators, where temporal variations in solidstate systems induce topological edge states. Here, we propose and experimentally demonstrate the first external field-free photonic topological insulator with scatter-free edge transport: a photonic lattice exhibiting topologically protected transport of visible light on the lattice edges. Our system is composed of an array of evanescently coupled helical waveguides arranged in a graphene-like honeycomb lattice. Paraxial diffraction of light is described by a Schrödinger equation where the propagation coordinate acts as ‘time’. Thus the waveguides' helicity breaks zreversal symmetry in the sense akin to Floquet Topological Insulators. This structure results in scatter-free, oneway edge states that are topologically protected from scattering.

Proceedings Article | 16 April 2008 Paper

Efficient linear-to-radial polarization converter for high-power lasers

G. Machavariani, S. Jackel, Y. Lumer, I. Moshe, A. Meir

Proceedings Volume 6998, 69980L (2008) https://doi.org/10.1117/12.780809

KEYWORDS: Polarization, Gaussian beams, Spatial filters, Near field, High power lasers, Nd:YAG lasers, Interferometry, Solids, Manufacturing, Crystals

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Proceedings Article | 27 April 2007 Paper

Transforming the (0,1)* LG mode with radial polarization to a nearly Gaussian beam by use of a spiral phase element and spatial filter

G. Machavariani, Y. Lumer, I. Moshe, S. Jackel

Proceedings Volume 6346, 63461W (2007) https://doi.org/10.1117/12.738861

KEYWORDS: Polarization, Spatial filters, Near field, Gaussian beams, Superposition, Solids, Polarizers, Diamond, Particles, Beam propagation method

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Proceedings Article | 26 April 2007 Paper

High-power radially polarized good-quality beams from aberration compensated rod-based Nd:YAG lasers

Inon Moshe, Steven Jackel, Avi Meir, Yaakov Lumer, Eyal Leibush

Proceedings Volume 6346, 63460X (2007) https://doi.org/10.1117/12.737393

KEYWORDS: Stars, Polarization, Nd:YAG lasers, Optical amplifiers, Oscillators, High power lasers, Monochromatic aberrations, Birefringence, Wave propagation, Polarizers

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Proceedings Article | 14 February 2007 Paper

Beam-quality enhancement in multi-kW rod-based lasers by use of radially polarized light and phase-front correction

Inon Moshe, Steven Jackel, Avi Meir, Yaakov Lumer, Galina Machavariani, Shai Rosenberg

Proceedings Volume 6452, 645202 (2007) https://doi.org/10.1117/12.721038

KEYWORDS: Stars, Polarization, Oscillators, Nd:YAG lasers, Monochromatic aberrations, Optical amplifiers, Transmission electron microscopy, High power lasers, Rod lasers, Solid state lasers

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Showing 5 of 6 publications

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