Publications by authors named "Fedja Jan Wendisch"
Breaking the in-plane geometric symmetry of dielectric metasurfaces allows us to access a set of electromagnetic states termed symmetry-protected -bound states in the continuum (BICs). Here we demonstrate that BICs can also be accessed by a symmetry breaking in the permittivity of the comprising materials. While the physical size of atoms imposes a limit on the lowest achievable geometrical asymmetry, weak permittivity modulations due to carrier doping, and electro-optical Pockels and Kerr effects, usually considered insignificant, open the possibility of infinitesimal permittivity asymmetries for on-demand, dynamically tunable resonances of extremely high quality factors.
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- The combination of metal-assisted chemical etching (MACE) and colloidal lithography creates a cost-effective method for producing silicon nanowire (SiNW) arrays at a large scale, although traditional methods lead to uniform, circular shapes.
- This study introduces a new approach to create anisotropic SiNWs with adjustable cross-sections by using metal films patterned with elliptical nanoholes formed from colloidal particles during tilted thermal evaporation.
- By manipulating the deposition angle of the metal and using these patterned templates, researchers can produce SiNWs with various shapes, such as elliptical or crescent cross-sections, leading to unique bundling and surface topographies.