Optical spatial differentiation with ultrathin freestanding subwavelength gratings

Ali A. Darki; Aurélien R. Dantan; Jens V. Nygaard; Søren P. Madsen; Alexios Parthenopoulos; Christian Vandborg

doi:10.1117/12.2621186

17 May 2022 Optical spatial differentiation with ultrathin freestanding subwavelength gratings

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

Proceedings Volume 12138, Optics, Photonics and Digital Technologies for Imaging Applications VII; 121380D (2022) https://doi.org/10.1117/12.2621186
Event: SPIE Photonics Europe, 2022, Strasbourg, France

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.

Conference Presentation

Citation Download Citation

Ali A. Darki, Aurélien R. Dantan, Jens V. Nygaard, Søren P. Madsen, Alexios Parthenopoulos, and Christian Vandborg "Optical spatial differentiation with ultrathin freestanding subwavelength gratings", Proc. SPIE 12138, Optics, Photonics and Digital Technologies for Imaging Applications VII, 121380D (17 May 2022); https://doi.org/10.1117/12.2621186

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