Optical spatial differentiation with suspended subwavelength gratings
| Autor: | Bjarke R. Jeppesen, Aurélien Dantan, Alexios Parthenopoulos, Ali Akbar Darki |
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| Rok vydání: | 2020 |
| Předmět: |
Plasma etching
Materials science business.industry Guided-mode resonance Physics::Optics FOS: Physical sciences 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics 010309 optics chemistry.chemical_compound Transverse plane Optics Silicon nitride chemistry Transmission (telecommunications) 0103 physical sciences 0210 nano-technology business Rigorous coupled-wave analysis Electron-beam lithography Physics - Optics Gaussian beam Optics (physics.optics) |
| Zdroj: | Parthenopoulos, A, Darki, A A, Jeppesen, B R & Dantan, A R 2021, ' Optical spatial differentiation with suspended subwavelength gratings ', Optics Express, vol. 29, no. 5, pp. 6481-6494 . https://doi.org/10.1364/OE.416801 |
| DOI: | 10.48550/arxiv.2008.10945 |
| Popis: | We investigate first- and second-order spatial differentiation of an optical beam transverse profile using guided-mode resonances in thin, suspended subwavelength gratings. Highly reflective one-dimensional gratings are patterned on freestanding 200 nm-thick silicon nitride membranes using Electron Beam Lithography and plasma etching. The optical transmission of these gratings, designed for illumination with either TM or TE polarized light, are experimentally measured under normal and oblique incidence and found to be in excellent agreement with the predictions of an analytical coupled-mode model as well as Rigorous Coupled Wave Analysis numerical simulations. Intensity profiles consistent with high quality first- and second-order spatial differentiation of a Gaussian beam are observed in transmission at oblique and normal incidence, respectively. Such easy-to-fabricate, ultrathin and loss-free optical components may be attractive for beam shaping and optical information processing and computing. |
| Databáze: | OpenAIRE |
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