Optical spatial differentiation with ultrathin freestanding subwavelength gratings

Ali A. Darki*, Aurélien Dantan, Jens V. Nygaard, Søren P. Madsen, Alexios Parthenopoulos, Christian Toft-Vandborg, Christian Vandborg

*Corresponding author for this work

Research output: Contribution to book/anthology/report/proceedingArticle in proceedingsResearchpeer-review

Abstract

We investigate spatial differentiation of optical beams using guided mode resonances in suspended dielectric one-dimensional photonic crystals. Various SiN grating structures are characterized under various incidence, polarization and beam size illuminations. We first observe first- and second-order spatial differentiation in transmission of Gaussian beams impinging at oblique and normal incidence, respectively, on gratings designed to be resonant for either TE- or TM-polarized incident light. Polarization-independent first-order spatial differentiation is then demonstrated with a specifically designed, doubly-resonant, one-dimensional and symmetric grating structure. Such ultrathin and essentially lossfree nanostructured dielectric films are promising for various optical processing, optomechanics and sensing applications.

Original languageEnglish
Title of host publicationOptics, Photonics and Digital Technologies for Imaging Applications VII
EditorsPeter Schelkens, Tomasz Kozacki
PublisherSPIE - International Society for Optical Engineering
Publication dateMay 2022
Article number121380D
ISBN (Electronic)9781510651524
DOIs
Publication statusPublished - May 2022
EventOptics, Photonics and Digital Technologies for Imaging Applications VII 2022 - Virtual, Online
Duration: 9 May 202215 May 2022

Conference

ConferenceOptics, Photonics and Digital Technologies for Imaging Applications VII 2022
CityVirtual, Online
Period09/05/202215/05/2022
SponsorCity of Strasbourg, French National Centre for Scientific Research (CNRS), iCube, Université de Strasbourg, The Society of Photo-Optical Instrumentation Engineers (SPIE), Université de Strasbourg
SeriesProceedings of SPIE - The International Society for Optical Engineering
Volume12138
ISSN0277-786X

Keywords

  • Optical spatial differentiation
  • photonic crystal
  • subwavelength grating

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