Prof. Miha Ravnik Profile

Prof. Miha Ravnik

Associate Professor at Univ of Ljubljana

SPIE Involvement:

Conference Program Committee | Author

Publications (23)

Proceedings Article | 18 June 2024 Presentation + Paper

Topology optimization of soft matter diffraction gratings

Peter Ropač, Miha Ravnik

Proceedings Volume 13017, 1301708 (2024) https://doi.org/10.1117/12.3015860

KEYWORDS: Diffraction gratings, Diffraction, Refractive index, Design, Manufacturing, Voxels, Optical design, Dielectrics, Visible radiation, Mathematical optimization

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Proceedings Article | 18 June 2024 Presentation

Direct laser-written waveguides for integrated liquid crystal micro-photonics

Igor Muševič, Mahendran Vellaichamy, Uroš Jagodič, Jaka Pišljar, Andreja Jelen, Andriy Nych, Miha Škarabot, Jaka Zaplotnik, Miha Ravnik

Proceedings Volume 13016, 130160H (2024) https://doi.org/10.1117/12.3022285

KEYWORDS: Waveguides, Printing, Liquid crystals, Attenuation, Refractive index, Light wave propagation, Glasses, Windows, Scanning electron microscopy, Optical circuits

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Proceedings Article | 13 March 2024 Presentation + Paper

Pixelated photonic crystals for THz applications

Urban Mur, Miha Ravnik

Proceedings Volume 12907, 129070B (2024) https://doi.org/10.1117/12.2692238

KEYWORDS: Photonic crystals, Dielectrics, Liquid crystals, Terahertz radiation, Image resolution, Design, Refractive index, Birefringence, Vacuum, Shape analysis

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Proceedings Article | 29 September 2023 Presentation + Paper

Photonic band edge and defect modes in 1D cholesteric liquid crystals

Jaka Zaplotnik, Urban Mur, Igor Muševič, Miha Ravnik

Proceedings Volume 12658, 1265806 (2023) https://doi.org/10.1117/12.2679288

KEYWORDS: Electric fields, Liquid crystals, Refractive index, Photonic crystals, Resonators, Polarized light, Transmittance, Reflection, Microresonators

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Proceedings Article | 14 March 2023 Presentation + Paper

Effects of waveguide surface micro-structure on the transmission of light

Peter Ropač, Miha Ravnik

Proceedings Volume 12442, 1244207 (2023) https://doi.org/10.1117/12.2647346

KEYWORDS: Waveguides, Refractive index, Solid state physics, Photonics, Polarized light, Solid state electronics, Silicon photonics, Reflection, Light scattering, Tunable filters

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Proceedings Article | 5 March 2021 Presentation + Paper

Design of two-dimensional photonic crystals using geometry and self-similarity

Peter Ropač, Urban Mur, Miha Ravnik

Proceedings Volume 11707, 117070I (2021) https://doi.org/10.1117/12.2584593

KEYWORDS: Dielectrics, Photonic crystals, Optical design, Optical components, Liquid crystals, Electromagnetism, Dispersion

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Proceedings Article | 1 September 2020 Presentation + Paper

Numerical modeling of optical modes in nematic droplets

Urban Mur, Miha Ravnik

Proceedings Volume 11472, 114720U (2020) https://doi.org/10.1117/12.2569382

KEYWORDS: Numerical modeling, Liquid crystals, Laser resonators, Electromagnetism, Optical components, Molecular self-assembly, Light-matter interactions, Modulation, Beam controllers

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Proceedings Article | 25 February 2020 Presentation + Paper

Controlling light with hyperbolic metamaterial director profiles

Anja Pusovnik, Miha Ravnik

Proceedings Volume 11303, 113030B (2020) https://doi.org/10.1117/12.2550819

KEYWORDS: Metamaterials, Liquid crystals, Absorption, Geometrical optics, Refractive index, Refraction, Finite-difference time-domain method, Wave propagation, Light wave propagation, Beam propagation method

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Proceedings Article | 8 February 2018 Paper

Electromagnetic response of dielectric nanostructures in liquid crystals

S. Amanaganti, D. R. Chowdhury, M. Ravnik, J. Dontabhaktuni

Proceedings Volume 10555, 105551F (2018) https://doi.org/10.1117/12.2289415

KEYWORDS: Dielectrics, Liquid crystals, Nanostructures, Resonators, Tellurium, Nanoparticles

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Proceedings Article | 13 October 2016 Presentation + Paper

Unveiling details of defect structures in chiral and achiral nematic droplets by improving simulations of optical images

Urban Mur, Simon Čopar, Miha Ravnik, Miha Čančula, Slobodan Žumer

Proceedings Volume 9940, 99400V (2016) https://doi.org/10.1117/12.2239585

KEYWORDS: Polarization, Optical simulations, Microscopy, Optical microscopy, Photomicroscopy, Liquid crystals, Phase shifts, Birefringence, Confocal microscopy, Polarizers

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Proceedings Article | 23 March 2016 Paper

Photonic crystals, light manipulation, and imaging in complex nematic structures

Miha Ravnik, Mitja Štimulak, Urban Mur, Miha Čančula, Simon Čopar, Slobodan Žumer

Proceedings Volume 9769, 97690B (2016) https://doi.org/10.1117/12.2214550

KEYWORDS: Photonic crystals, Liquid crystals, Finite-difference time-domain method, Birefringence, Numerical modeling, Polarization, Dielectrics, Geometrical optics, Photomicroscopy, Dielectric polarization, Phase shifts

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Proceedings Article | 5 October 2015 Open Access

Complex topological structures of frustrated liquid crystals with potential for optics and photonics (Presentation Recording)

Slobodan Žumer, Miha Čančula, Simon Čopar, Miha Ravnik

Proceedings Volume 9565, 95650W (2015) https://doi.org/10.1117/12.2190237

KEYWORDS: Geometrical optics, Photonics, Liquid crystals, Particles, Optical tweezers, Modeling, Finite-difference time-domain method, Beam propagation method, Video, Current controlled current source

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Proceedings Article | 11 March 2015 Open Access

Nematic topological line defects as optical waveguides

Miha Čančula, Miha Ravnik, Slobodan Žumer

Proceedings Volume 9384, 938402 (2015) https://doi.org/10.1117/12.2079096

KEYWORDS: Polarization, Liquid crystals, Finite-difference time-domain method, Modulation, Radio propagation, Light wave propagation, Waveguides, Birefringence, Beam propagation method, Maxwell's equations

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Proceedings Article | 7 October 2014 Open Access

Imaging and visualization of complex nematic fields

Slobodan Žumer, Miha Čančula, Simon Čopar, Miha Ravnik

Proceedings Volume 9182, 91820C (2014) https://doi.org/10.1117/12.2062468

KEYWORDS: Visualization, Particles, Microscopy, Polarization, Liquid crystals, Phase modulation, Luminescence, Confocal microscopy, Single sideband modulation, Multiphoton fluorescence microscopy

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Proceedings Article | 19 February 2014 Paper

Nematic colloidal tilings as photonic materials

M. Ravnik, J. Dontabhaktuni, M. Cancula, S. Zumer

Proceedings Volume 9004, 90040C (2014) https://doi.org/10.1117/12.2044586

KEYWORDS: Liquid crystals, Particles, Finite-difference time-domain method, Diffraction, Crystals, Photonic crystals, Geometrical optics, Polarization, Modeling, Distortion

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Proceedings Article | 11 October 2012 Paper

Complex field-induced nematic defect structures in Laguerre-Gaussian optical tweezers

Slobodan Žumer, Tine Porenta, Miha Ravnik

Proceedings Volume 8475, 84750V (2012) https://doi.org/10.1117/12.930450

KEYWORDS: Dielectric polarization, Optical tweezers, Liquid crystals, Particles, Polarization, Absorption, Dielectrics, Gaussian beams, Refractive index, Doping

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Proceedings Article | 17 September 2011 Paper

Confined blue phases: trapping of colloidal particles in disclination superstructures

Slobodan Zumer, Miha Ravnik, Jun-ichi Fukuda

Proceedings Volume 8114, 811403 (2011) https://doi.org/10.1117/12.893160

KEYWORDS: Particles, Liquid crystals, Crystals, Photonic crystals, Molecular self-assembly, Liquids, Phase shift keying, Physics, Plasmonics, Polymers

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Proceedings Article | 18 August 2010 Paper

Blue phases as templates for 3D colloidal photonic crystals

Slobodan Zumer, Miha Ravnik, Tine Porenta, Gareth Alexander, Julia Yeomans

Proceedings Volume 7775, 77750H (2010) https://doi.org/10.1117/12.860718

KEYWORDS: Particles, Liquid crystals, Crystals, Photonic crystals, Liquids, Charged particle optics, 3D modeling, Double patterning technology, Molecular self-assembly, Polymers

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Proceedings Article | 21 August 2009 Paper

Colloidal structures and interactions in a nematic liquid crystal

Miha Skarabot, Miha Ravnik, Uros Tkalec, Matjaz Humar, Slobodan Zumer, Andriy Nych, Ulyana Ognysta, Vassili Nazarenko, Igor Musevic

Proceedings Volume 7414, 74140M (2009) https://doi.org/10.1117/12.827981

KEYWORDS: Particles, Liquid crystals, Crystals, Saturn, Optical tweezers, Nanoparticles, Photonic crystals, Diffraction, Molecular self-assembly, Molecules

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Proceedings Article | 29 August 2008 Paper

Optical manipulation of nematic colloids: wires, superstructures, and 2D crystals

Igor Muševič, Miha Škarabot, Miha Ravnik, Uroš Tkalec, Andriy Nych, Ulyana Ognysta, Vassili Nazarenko, Slobodan Žumer

Proceedings Volume 7038, 70381A (2008) https://doi.org/10.1117/12.796066

KEYWORDS: Particles, Liquid crystals, Crystals, Saturn, Optical tweezers, Molecules, Binary data, Optical manipulation, Silica, Optical spheres

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Proceedings Article | 29 January 2008 Paper

Nematic colloidal assemblies: towards photonic crystals and metamaterials

Slobodan Žumer, Igor Muševic, Miha Ravnik, Miha Škarabot, Igor Poberaj, Dušan Babič, Uroš Tkalec

Proceedings Volume 6911, 69110C (2008) https://doi.org/10.1117/12.769070

KEYWORDS: Particles, Crystals, Liquid crystals, Polarization, Photomicroscopy, Photonic crystals, Metamaterials, Visualization, Optical tweezers, Optical properties

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Proceedings Article | 4 May 2007 Paper

Self-assembly in nematic colloids

Igor Muševič, Miha Škarabot, Miha Ravnik, Uroš Tkalec, Igor Poberaj, Dušan Babič, Slobodan Žumer

Proceedings Volume 6587, 658704 (2007) https://doi.org/10.1117/12.724547

KEYWORDS: Particles, Liquid crystals, Crystals, Molecular self-assembly, Optical tweezers, Photonic crystals, Laser crystals, Silica, Liquid crystal lasers, Directed self assembly

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Proceedings Article | 15 September 2006 Paper

Laser trapping of low refractive index colloidal particles in a nematic liquid crystal

Igor Muševič, Miha Škarabot, Miha Ravnik, Igor Poberaj, Dušan Babič, Natan Osterman, Andriy Nych, Ulyana Ognysta, Vassili Nazarenko, Slobodan Žumer

Proceedings Volume 6332, 63320V (2006) https://doi.org/10.1117/12.680971

KEYWORDS: Particles, Liquid crystals, Optical trapping, Refractive index, Dielectric polarization, Optical tweezers, Dielectrics, Refraction, Distortion, Silica

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