Digitized subwavelength surface structure on silicon platform for wavelength‐/polarization‐/charge‐diverse optical vortex generation
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Le résumé fourni par la source
Abstract Optical vortices carrying orbital angular momentum (OAM) have recently attracted increasing interest for providing an additional degree of freedom for capacity scaling in optical communications. The optical vortex generator is an essential component to facilitate OAM‐enabled optical communications. Traditional devices face challenges of limited compactness, narrow bandwidth, and first‐order OAM modes. Here, using the direct‐binary search (DBS) optimization algorithm, we design, fabricate, and demonstrate a digitized subwavelength surface structure on silicon platform for the generation of wavelength‐/polarization‐/charge‐diverse optical vortices. It features an ultra‐compact footprint (∼3.6 × 3.6 μm 2 ) and ultra‐wide bandwidth (1480–1630 nm), supporting two polarizations ( x ‐pol., y ‐pol.) and high‐order OAM modes (OAM +1 , OAM −1 , OAM +2 , OAM −2 ) with high purity of larger than 84%. The mode crosstalk matrix is measured in the experiment with favorable performance. When generating x ‐pol. OAM +1 , x ‐pol. OAM −1 , y ‐pol. OAM +1 , and y‐pol. OAM −1 mode, the crosstalk of the worst case is less than −14 dB. When generating OAM +1 , OAM −1 , OAM +2 , and OAM −2 mode, the crosstalk between any two OAM modes is less than −10 dB, and the lowest crosstalk is about −17 dB. In addition, we also show the possibility for generating much higher‐order OAM modes (e.g. OAM +3 , OAM −3 , OAM +4 , and OAM −4 ) with the digitized subwavelength surface structure. The wavelength‐/polarization‐/charge‐diverse optical vortex generator enables the full access of multiple physical dimensions (wavelength, polarization, space) of lightwaves. The demonstrations may open up new perspectives for chip‐scale solutions to multi‐dimensional multiplexing optical communications.
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Le contrôle bibliographique ouvert
DOI retrouvé dans Crossref DOI retrouvé ; titre concordant.
- Titre Crossref
- Digitized subwavelength surface structure on silicon platform for wavelength‐/polarization‐/charge‐diverse optical vortex generation
- Date Crossref
- 01/09/2022
- Éditeur
- Wiley
- Type
- journal-article
Ce recoupement confirme des métadonnées liées au DOI. Il ne confirme ni la méthode ni les conclusions de l’étude, et il ne compte pas comme une seconde source scientifique indépendante.
Où se fait cette recherche
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Wuhan National Laboratory for Optoelectronics pays non établi dans la noticeStructure de recherche
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Huazhong University of Science and Technology pays non établi dans la noticeUniversité ou école supérieure
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Sun Yat-sen University pays non établi dans la noticeUniversité ou école supérieure
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State Key Laboratory of Optoelectronic Materials and Technology pays non établi dans la noticeStructure de recherche
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Optics Valley Laboratory Wuhan 430074 Hubei China pays non établi dans la noticeStructure de recherche
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State Key Laboratory of Optoelectronic Materials and Technologies and School of Physics and Engineering Sun Yatsen University Guangzhou 510275 China pays non établi dans la noticeUniversité ou école supérieure
Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology et Sun Yat-sen University, avec 3 autres affiliations.
Une affiliation ne permet pas de déduire la nationalité d’un auteur.