Blar i SINTEF Open på forfatter "Dirdal, Christopher Andrew"

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    • Dynamic piezoelectric MEMS-based optical metasurfaces 

      Meng, Chao; Thrane, Paul Conrad Vaagen; Ding, Fei; Gjessing, Jo; Thomaschewski, Martin; Wu, Cuo; Dirdal, Christopher Andrew; Bozhevolnyi, Sergey (Peer reviewed; Journal article, 2021)
      Optical metasurfaces (OMSs) have shown unprecedented capabilities for versatile wavefront manipulations at the subwavelength scale. However, most well-established OMSs are static, featuring well-defined optical responses ...

    • Four definitions of magnetic permeability for periodic metamaterials 

      Skaar, Johannes; Hågenvik, Hans Olaf; Dirdal, Christopher Andrew (Journal article; Peer reviewed, 2019)
      We state and compare four different definitions of magnetic permeability for periodic, artificial media, or metamaterials. The connections among them, and properties in general, are discussed in detail, including causality, ...

    • MEMS-tunable dielectric metasurface lens using thin-film PZT for large displacements at low voltages 

      Dirdal, Christopher Andrew; Thrane, Paul Conrad Vaagen; Dullo, Firehun Tsige; Gjessing, Jo; Summanwar, Anand; Tschudi, Jon (Peer reviewed; Journal article, 2022)
      Tunable focusing is a desired property in a wide range of optical imaging and sensing technologies but has tended to require bulky components that cannot be integrated on-chip and have slow actuation speeds. Recently, ...

    • Metasurface Fabrication by Cryogenic and Bosch Deep Reactive Ion Etching 

      Baracu, Angela; Dirdal, Christopher Andrew; Avram, Andrei; Dinescu, Adrian; Muller, Raluca; Jensen, Geir Uri; Thrane, Paul Conrad Vaagen; Angelskår, Hallvard (Peer reviewed; Journal article, 2021)
      The research field of metasurfaces has attracted considerable attention in recent years due to its high potential to achieve flat, ultrathin optical devices of high performance. Metasurfaces, consisting of artificial ...

    • Silicon Metalens Fabrication from Electron Beam to UV-Nanoimprint Lithography 

      Baracu, Angela; Avram, Marius Andrei; Breazu, Carmen; Bunea, Mihaela-Cristina; Socol, Marcela; Stanculescu, Anca; Matei, Elena; Thrane, Paul Conrad Vaagen; Dirdal, Christopher Andrew; Dinescu, Adrian; Rasoga, Oana (Peer reviewed; Journal article, 2021)
      This study presents the design and manufacture of metasurface lenses optimized for focusing light with 1.55 µm wavelength. The lenses are fabricated on silicon substrates using electron beam lithography, ultraviolet-nanoimprint ...

    • Towards high-throughput large-area metalens fabrication using UV-nanoimprint lithography and Bosch deep reactive ion etching 

      Dirdal, Christopher Andrew; Jensen, Geir Uri; Angelskår, Hallvard; Thrane, Paul Conrad Vaagen; Gjessing, Jo; Ordnung, Daniel Alfred (Peer reviewed; Journal article, 2020)
      We demonstrate the fabrication of diffraction-limited dielectric metasurface lenses for NIR by the use of standard industrial high-throughput silicon processing techniques: UV nano imprint lithography (UV-NIL) combined ...